### Home Classes Methods

### In Files

- lib/sequel/model/associations.rb

### Methods

- #all_association_reflections
- #apply_association_dataset_opts
- #associate
- #association_reflection
- #associations
- #eager_loading_dataset
- #many_to_many
- #many_to_one
- #one_to_many
- #one_to_one

### Files

- CHANGELOG
- MIT-LICENSE
- README.rdoc
- active_record.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- bin_sequel.rdoc
- cheat_sheet.rdoc
- code_order.rdoc
- core_extensions.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- mass_assignment.rdoc
- migration.rdoc
- model_hooks.rdoc
- object_model.rdoc
- opening_databases.rdoc
- postgresql.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
- 1.1.txt
- 1.3.txt
- 1.4.0.txt
- 1.5.0.txt
- 2.0.0.txt
- 2.1.0.txt
- 2.10.0.txt
- 2.11.0.txt
- 2.12.0.txt
- 2.2.0.txt
- 2.3.0.txt
- 2.4.0.txt
- 2.5.0.txt
- 2.6.0.txt
- 2.7.0.txt
- 2.8.0.txt
- 2.9.0.txt
- 3.0.0.txt
- 3.1.0.txt
- 3.10.0.txt
- 3.11.0.txt
- 3.12.0.txt
- 3.13.0.txt
- 3.14.0.txt
- 3.15.0.txt
- 3.16.0.txt
- 3.17.0.txt
- 3.18.0.txt
- 3.19.0.txt
- 3.2.0.txt
- 3.20.0.txt
- 3.21.0.txt
- 3.22.0.txt
- 3.23.0.txt
- 3.24.0.txt
- 3.25.0.txt
- 3.26.0.txt
- 3.27.0.txt
- 3.28.0.txt
- 3.29.0.txt
- 3.3.0.txt
- 3.30.0.txt
- 3.31.0.txt
- 3.32.0.txt
- 3.33.0.txt
- 3.34.0.txt
- 3.35.0.txt
- 3.36.0.txt
- 3.37.0.txt
- 3.38.0.txt
- 3.39.0.txt
- 3.4.0.txt
- 3.40.0.txt
- 3.41.0.txt
- 3.42.0.txt
- 3.43.0.txt
- 3.44.0.txt
- 3.45.0.txt
- 3.46.0.txt
- 3.47.0.txt
- 3.48.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- schema_modification.rdoc
- security.rdoc
- sharding.rdoc
- sql.rdoc
- testing.rdoc
- thread_safety.rdoc
- transactions.rdoc
- validations.rdoc
- virtual_rows.rdoc

### Class/Module Index

Quicksearch

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- Sequel::JDBC::Dataset::TYPE_TRANSLATOR
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- Sequel::JDBC::Derby::DatabaseMethods
- Sequel::JDBC::Derby::Dataset
- Sequel::JDBC::Firebird
- Sequel::JDBC::Firebird::DatabaseMethods
- Sequel::JDBC::H2
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- Sequel::JDBC::H2::Dataset
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- Sequel::JDBC::JavaLang
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- Sequel::JDBC::MSSQL::DatabaseMethods
- Sequel::JDBC::MySQL
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- Sequel::JDBC::Oracle
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- Sequel::JDBC::Oracle::Dataset
- Sequel::JDBC::Postgres
- Sequel::JDBC::Postgres::DatabaseMethods
- Sequel::JDBC::Postgres::Dataset
- Sequel::JDBC::Postgres::Dataset::PGArrayConverter
- Sequel::JDBC::Progress
- Sequel::JDBC::Progress::DatabaseMethods
- Sequel::JDBC::SQLServer
- Sequel::JDBC::SQLServer::DatabaseMethods
- Sequel::JDBC::SQLServer::DatabaseMethods::MetadataDatasetMethods
- Sequel::JDBC::SQLite
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- Sequel::JDBC::Transactions
- Sequel::LiteralString
- Sequel::LooserTypecasting
- Sequel::MSSQL
- Sequel::MSSQL::DatabaseMethods
- Sequel::MSSQL::DatasetMethods
- Sequel::Metaprogramming
- Sequel::Migration
- Sequel::MigrationAlterTableReverser
- Sequel::MigrationDSL
- Sequel::MigrationReverser
- Sequel::Migrator
- Sequel::Migrator::Error
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- Sequel::Mock
- Sequel::Mock::Connection
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- Sequel::Model::Associations::AssociationDatasetMethods
- Sequel::Model::Associations::AssociationReflection
- Sequel::Model::Associations::ClassMethods
- Sequel::Model::Associations::DatasetMethods
- Sequel::Model::Associations::EagerGraphLoader
- Sequel::Model::Associations::InstanceMethods
- Sequel::Model::Associations::ManyToManyAssociationReflection
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- Sequel::Model::Associations::OneToManyAssociationReflection
- Sequel::Model::Associations::OneToOneAssociationReflection
- Sequel::Model::ClassMethods
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- Sequel::Model::DatasetModule
- Sequel::Model::Errors
- Sequel::Model::InstanceMethods
- Sequel::MySQL
- Sequel::MySQL::Database
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- Sequel::MySQL::Dataset
- Sequel::MySQL::DatasetMethods
- Sequel::MySQL::PreparedStatements
- Sequel::MySQL::PreparedStatements::DatabaseMethods
- Sequel::MySQL::PreparedStatements::DatasetMethods
- Sequel::MySQL::PreparedStatements::DatasetMethods::CallableStatementMethods
- Sequel::MySQL::PreparedStatements::DatasetMethods::PreparedStatementMethods
- Sequel::MySQL::PreparedStatements::DatasetMethods::StoredProcedureMethods
- Sequel::Mysql2
- Sequel::Mysql2::Database
- Sequel::Mysql2::Dataset
- Sequel::NamedTimezones
- Sequel::NamedTimezones::DatabaseMethods
- Sequel::NoExistingObject
- Sequel::NoMatchingRow
- Sequel::NotImplemented
- Sequel::NotNullConstraintViolation
- Sequel::ODBC
- Sequel::ODBC::Database
- Sequel::ODBC::Dataset
- Sequel::ODBC::MSSQL
- Sequel::ODBC::MSSQL::DatabaseMethods
- Sequel::ODBC::MSSQL::Dataset
- Sequel::OpenBase
- Sequel::OpenBase::Database
- Sequel::OpenBase::Dataset
- Sequel::Oracle
- Sequel::Oracle::Database
- Sequel::Oracle::DatabaseMethods
- Sequel::Oracle::Dataset
- Sequel::Oracle::Dataset::ArgumentMapper
- Sequel::Oracle::Dataset::BindArgumentMethods
- Sequel::Oracle::Dataset::PreparedStatementMethods
- Sequel::Oracle::DatasetMethods
- Sequel::Plugins
- Sequel::Plugins::ActiveModel
- Sequel::Plugins::ActiveModel::ClassMethods
- Sequel::Plugins::ActiveModel::Errors
- Sequel::Plugins::ActiveModel::InstanceMethods
- Sequel::Plugins::AfterInitialize
- Sequel::Plugins::AfterInitialize::ClassMethods
- Sequel::Plugins::AfterInitialize::InstanceMethods
- Sequel::Plugins::AssociationAutoreloading
- Sequel::Plugins::AssociationAutoreloading::ClassMethods
- Sequel::Plugins::AssociationAutoreloading::InstanceMethods
- Sequel::Plugins::AssociationDependencies
- Sequel::Plugins::AssociationDependencies::ClassMethods
- Sequel::Plugins::AssociationDependencies::InstanceMethods
- Sequel::Plugins::AssociationPks
- Sequel::Plugins::AssociationPks::ClassMethods
- Sequel::Plugins::AssociationPks::InstanceMethods
- Sequel::Plugins::AssociationProxies
- Sequel::Plugins::AssociationProxies::AssociationProxy
- Sequel::Plugins::AssociationProxies::ClassMethods
- Sequel::Plugins::AutoValidations
- Sequel::Plugins::AutoValidations::ClassMethods
- Sequel::Plugins::AutoValidations::InstanceMethods
- Sequel::Plugins::BlacklistSecurity
- Sequel::Plugins::BlacklistSecurity::ClassMethods
- Sequel::Plugins::BlacklistSecurity::InstanceMethods
- Sequel::Plugins::BooleanReaders
- Sequel::Plugins::BooleanReaders::ClassMethods
- Sequel::Plugins::Caching
- Sequel::Plugins::Caching::ClassMethods
- Sequel::Plugins::Caching::InstanceMethods
- Sequel::Plugins::ClassTableInheritance
- Sequel::Plugins::ClassTableInheritance::ClassMethods
- Sequel::Plugins::ClassTableInheritance::InstanceMethods
- Sequel::Plugins::Composition
- Sequel::Plugins::Composition::ClassMethods
- Sequel::Plugins::Composition::InstanceMethods
- Sequel::Plugins::ConstraintValidations
- Sequel::Plugins::ConstraintValidations::ClassMethods
- Sequel::Plugins::ConstraintValidations::DatabaseMethods
- Sequel::Plugins::ConstraintValidations::InstanceMethods
- Sequel::Plugins::DatasetAssociations
- Sequel::Plugins::DatasetAssociations::ClassMethods
- Sequel::Plugins::DatasetAssociations::DatasetMethods
- Sequel::Plugins::DefaultsSetter
- Sequel::Plugins::DefaultsSetter::ClassMethods
- Sequel::Plugins::DefaultsSetter::InstanceMethods
- Sequel::Plugins::Dirty
- Sequel::Plugins::Dirty::InstanceMethods
- Sequel::Plugins::EagerEach
- Sequel::Plugins::EagerEach::DatasetMethods
- Sequel::Plugins::ErrorSplitter
- Sequel::Plugins::ErrorSplitter::InstanceMethods
- Sequel::Plugins::ForceEncoding
- Sequel::Plugins::ForceEncoding::ClassMethods
- Sequel::Plugins::ForceEncoding::InstanceMethods
- Sequel::Plugins::HookClassMethods
- Sequel::Plugins::HookClassMethods::ClassMethods
- Sequel::Plugins::HookClassMethods::InstanceMethods
- Sequel::Plugins::IdentityMap
- Sequel::Plugins::IdentityMap::ClassMethods
- Sequel::Plugins::IdentityMap::InstanceMethods
- Sequel::Plugins::InputTransformer
- Sequel::Plugins::InputTransformer::ClassMethods
- Sequel::Plugins::InputTransformer::InstanceMethods
- Sequel::Plugins::InstanceFilters
- Sequel::Plugins::InstanceFilters::Error
- Sequel::Plugins::InstanceFilters::InstanceMethods
- Sequel::Plugins::InstanceHooks
- Sequel::Plugins::InstanceHooks::InstanceMethods
- Sequel::Plugins::JsonSerializer
- Sequel::Plugins::JsonSerializer::ClassMethods
- Sequel::Plugins::JsonSerializer::DatasetMethods
- Sequel::Plugins::JsonSerializer::InstanceMethods
- Sequel::Plugins::JsonSerializer::Literal
- Sequel::Plugins::LazyAttributes
- Sequel::Plugins::LazyAttributes::ClassMethods
- Sequel::Plugins::LazyAttributes::InstanceMethods
- Sequel::Plugins::List
- Sequel::Plugins::List::ClassMethods
- Sequel::Plugins::List::InstanceMethods
- Sequel::Plugins::ManyThroughMany
- Sequel::Plugins::ManyThroughMany::ClassMethods
- Sequel::Plugins::ManyThroughMany::DatasetMethods
- Sequel::Plugins::ManyThroughMany::ManyThroughManyAssociationReflection
- Sequel::Plugins::ManyToOnePkLookup
- Sequel::Plugins::ManyToOnePkLookup::ClassMethods
- Sequel::Plugins::ManyToOnePkLookup::InstanceMethods
- Sequel::Plugins::NestedAttributes
- Sequel::Plugins::NestedAttributes::ClassMethods
- Sequel::Plugins::NestedAttributes::InstanceMethods
- Sequel::Plugins::OptimisticLocking
- Sequel::Plugins::OptimisticLocking::ClassMethods
- Sequel::Plugins::OptimisticLocking::InstanceMethods
- Sequel::Plugins::PgRow
- Sequel::Plugins::PgRow::ClassMethods
- Sequel::Plugins::PgRow::DatabaseMethods
- Sequel::Plugins::PgRow::InstanceMethods
- Sequel::Plugins::PgTypecastOnLoad
- Sequel::Plugins::PgTypecastOnLoad::ClassMethods
- Sequel::Plugins::PgTypecastOnLoad::InstanceMethods
- Sequel::Plugins::PreparedStatements
- Sequel::Plugins::PreparedStatements::ClassMethods
- Sequel::Plugins::PreparedStatements::InstanceMethods
- Sequel::Plugins::PreparedStatementsAssociations
- Sequel::Plugins::PreparedStatementsAssociations::ClassMethods
- Sequel::Plugins::PreparedStatementsAssociations::InstanceMethods
- Sequel::Plugins::PreparedStatementsSafe
- Sequel::Plugins::PreparedStatementsSafe::ClassMethods
- Sequel::Plugins::PreparedStatementsSafe::InstanceMethods
- Sequel::Plugins::PreparedStatementsWithPk
- Sequel::Plugins::PreparedStatementsWithPk::ClassMethods
- Sequel::Plugins::PreparedStatementsWithPk::DatasetMethods
- Sequel::Plugins::RcteTree
- Sequel::Plugins::Schema
- Sequel::Plugins::Schema::ClassMethods
- Sequel::Plugins::Scissors
- Sequel::Plugins::Scissors::ClassMethods
- Sequel::Plugins::Serialization
- Sequel::Plugins::Serialization::ClassMethods
- Sequel::Plugins::Serialization::InstanceMethods
- Sequel::Plugins::SerializationModificationDetection
- Sequel::Plugins::SerializationModificationDetection::InstanceMethods
- Sequel::Plugins::Sharding
- Sequel::Plugins::Sharding::ClassMethods
- Sequel::Plugins::Sharding::DatasetMethods
- Sequel::Plugins::Sharding::InstanceMethods
- Sequel::Plugins::SingleTableInheritance
- Sequel::Plugins::SingleTableInheritance::ClassMethods
- Sequel::Plugins::SingleTableInheritance::InstanceMethods
- Sequel::Plugins::SkipCreateRefresh
- Sequel::Plugins::SkipCreateRefresh::InstanceMethods
- Sequel::Plugins::StaticCache
- Sequel::Plugins::StaticCache::ClassMethods
- Sequel::Plugins::StringStripper
- Sequel::Plugins::StringStripper::ClassMethods
- Sequel::Plugins::Subclasses
- Sequel::Plugins::Subclasses::ClassMethods
- Sequel::Plugins::TacticalEagerLoading
- Sequel::Plugins::TacticalEagerLoading::DatasetMethods
- Sequel::Plugins::TacticalEagerLoading::InstanceMethods
- Sequel::Plugins::Timestamps
- Sequel::Plugins::Timestamps::ClassMethods
- Sequel::Plugins::Timestamps::InstanceMethods
- Sequel::Plugins::Touch
- Sequel::Plugins::Touch::ClassMethods
- Sequel::Plugins::Touch::InstanceMethods
- Sequel::Plugins::Tree
- Sequel::Plugins::Tree::ClassMethods
- Sequel::Plugins::Tree::InstanceMethods
- Sequel::Plugins::Tree::SingleRoot
- Sequel::Plugins::Tree::SingleRoot::ClassMethods
- Sequel::Plugins::Tree::SingleRoot::InstanceMethods
- Sequel::Plugins::Tree::TreeMultipleRootError
- Sequel::Plugins::TypecastOnLoad
- Sequel::Plugins::TypecastOnLoad::ClassMethods
- Sequel::Plugins::TypecastOnLoad::InstanceMethods
- Sequel::Plugins::UnlimitedUpdate
- Sequel::Plugins::UnlimitedUpdate::InstanceMethods
- Sequel::Plugins::UpdatePrimaryKey
- Sequel::Plugins::UpdatePrimaryKey::InstanceMethods
- Sequel::Plugins::ValidationClassMethods
- Sequel::Plugins::ValidationClassMethods::ClassMethods
- Sequel::Plugins::ValidationClassMethods::ClassMethods::Generator
- Sequel::Plugins::ValidationClassMethods::InstanceMethods
- Sequel::Plugins::ValidationHelpers
- Sequel::Plugins::ValidationHelpers::InstanceMethods
- Sequel::Plugins::XmlSerializer
- Sequel::Plugins::XmlSerializer::ClassMethods
- Sequel::Plugins::XmlSerializer::DatasetMethods
- Sequel::Plugins::XmlSerializer::InstanceMethods
- Sequel::PoolTimeout
- Sequel::Postgres
- Sequel::Postgres::Adapter
- Sequel::Postgres::AlterTableGenerator
- Sequel::Postgres::ArrayOp
- Sequel::Postgres::ArrayOpMethods
- Sequel::Postgres::AutoParameterize
- Sequel::Postgres::AutoParameterize::DatabaseMethods
- Sequel::Postgres::AutoParameterize::DatasetMethods
- Sequel::Postgres::AutoParameterize::StringWithArray
- Sequel::Postgres::CreateTableGenerator
- Sequel::Postgres::Database
- Sequel::Postgres::DatabaseMethods
- Sequel::Postgres::Dataset
- Sequel::Postgres::Dataset::ArgumentMapper
- Sequel::Postgres::Dataset::BindArgumentMethods
- Sequel::Postgres::Dataset::PreparedStatementMethods
- Sequel::Postgres::DatasetMethods
- Sequel::Postgres::DatasetMethods::PreparedStatementMethods
- Sequel::Postgres::ExclusionConstraintViolation
- Sequel::Postgres::HStore
- Sequel::Postgres::HStore::DatabaseMethods
- Sequel::Postgres::HStore::Parser
- Sequel::Postgres::HStoreOp
- Sequel::Postgres::HStoreOpMethods
- Sequel::Postgres::InetDatabaseMethods
- Sequel::Postgres::InetDatasetMethods
- Sequel::Postgres::IntervalDatabaseMethods
- Sequel::Postgres::IntervalDatabaseMethods::Parser
- Sequel::Postgres::IntervalDatasetMethods
- Sequel::Postgres::JSONArray
- Sequel::Postgres::JSONDatabaseMethods
- Sequel::Postgres::JSONHash
- Sequel::Postgres::PGArray
- Sequel::Postgres::PGArray::Creator
- Sequel::Postgres::PGArray::DatabaseMethods
- Sequel::Postgres::PGArray::JSONCreator
- Sequel::Postgres::PGArray::Parser
- Sequel::Postgres::PGRange
- Sequel::Postgres::PGRange::DatabaseMethods
- Sequel::Postgres::PGRange::DatasetMethods
- Sequel::Postgres::PGRange::Parser
- Sequel::Postgres::PGRow
- Sequel::Postgres::PGRow::ArrayRow
- Sequel::Postgres::PGRow::DatabaseMethods
- Sequel::Postgres::PGRow::HashRow
- Sequel::Postgres::PGRow::Parser
- Sequel::Postgres::PGRow::Splitter
- Sequel::Postgres::PGRowOp
- Sequel::Postgres::PGRowOp::ExpressionMethods
- Sequel::Postgres::RangeOp
- Sequel::Postgres::RangeOpMethods
- Sequel::Postgres::StatementCache
- Sequel::Postgres::StatementCache::AdapterMethods
- Sequel::Postgres::StatementCache::DatabaseMethods
- Sequel::Postgres::StatementCache::Statement
- Sequel::Postgres::StatementCache::StatementCache
- Sequel::PrettyTable
- Sequel::Progress
- Sequel::Progress::DatabaseMethods
- Sequel::Progress::DatasetMethods
- Sequel::Qualifier
- Sequel::QueryLiterals
- Sequel::Rollback
- Sequel::SQL
- Sequel::SQL::AliasMethods
- Sequel::SQL::AliasedExpression
- Sequel::SQL::BitwiseMethods
- Sequel::SQL::Blob
- Sequel::SQL::BooleanConstant
- Sequel::SQL::BooleanExpression
- Sequel::SQL::BooleanMethods
- Sequel::SQL::Builders
- Sequel::SQL::CaseExpression
- Sequel::SQL::Cast
- Sequel::SQL::CastMethods
- Sequel::SQL::ColumnAll
- Sequel::SQL::ComplexExpression
- Sequel::SQL::ComplexExpressionMethods
- Sequel::SQL::Constant
- Sequel::SQL::Constants
- Sequel::SQL::DateAdd
- Sequel::SQL::DateAdd::DatasetMethods
- Sequel::SQL::DelayedEvaluation
- Sequel::SQL::EmulatedFunction
- Sequel::SQL::Expression
- Sequel::SQL::Function
- Sequel::SQL::GenericExpression
- Sequel::SQL::Identifier
- Sequel::SQL::InequalityMethods
- Sequel::SQL::JoinClause
- Sequel::SQL::JoinOnClause
- Sequel::SQL::JoinUsingClause
- Sequel::SQL::NegativeBooleanConstant
- Sequel::SQL::NoBooleanInputMethods
- Sequel::SQL::NumericExpression
- Sequel::SQL::NumericMethods
- Sequel::SQL::OperatorBuilders
- Sequel::SQL::OrderMethods
- Sequel::SQL::OrderedExpression
- Sequel::SQL::PlaceholderLiteralString
- Sequel::SQL::QualifiedIdentifier
- Sequel::SQL::QualifyingMethods
- Sequel::SQL::SQLArray
- Sequel::SQL::StringConcatenationMethods
- Sequel::SQL::StringExpression
- Sequel::SQL::StringMethods
- Sequel::SQL::Subscript
- Sequel::SQL::SubscriptMethods
- Sequel::SQL::ValueList
- Sequel::SQL::VirtualRow
- Sequel::SQL::Window
- Sequel::SQL::WindowFunction
- Sequel::SQL::Wrapper
- Sequel::SQLTime
- Sequel::SQLite
- Sequel::SQLite::Database
- Sequel::SQLite::DatabaseMethods
- Sequel::SQLite::Dataset
- Sequel::SQLite::Dataset::ArgumentMapper
- Sequel::SQLite::Dataset::BindArgumentMethods
- Sequel::SQLite::Dataset::PreparedStatementMethods
- Sequel::SQLite::DatasetMethods
- Sequel::Schema
- Sequel::Schema::AlterTableGenerator
- Sequel::Schema::CreateTableGenerator
- Sequel::Schema::Generator
- Sequel::SchemaCaching
- Sequel::SchemaDumper
- Sequel::SelectRemove
- Sequel::Sequel3DatasetMethods
- Sequel::SerializationFailure
- Sequel::ServerBlock
- Sequel::SetOverrides
- Sequel::ShardedSingleConnectionPool
- Sequel::ShardedThreadedConnectionPool
- Sequel::SimpleMigration
- Sequel::SingleConnectionPool
- Sequel::Swift
- Sequel::Swift::Database
- Sequel::Swift::Dataset
- Sequel::Swift::MySQL
- Sequel::Swift::MySQL::DatabaseMethods
- Sequel::Swift::MySQL::Dataset
- Sequel::Swift::Postgres
- Sequel::Swift::Postgres::DatabaseMethods
- Sequel::Swift::SQLite
- Sequel::Swift::SQLite::DatabaseMethods
- Sequel::Swift::SQLite::Dataset
- Sequel::ThreadLocalTimezones
- Sequel::ThreadedConnectionPool
- Sequel::ThreadedServerBlock
- Sequel::TimestampMigrator
- Sequel::Timezones
- Sequel::TinyTDS
- Sequel::TinyTDS::Database
- Sequel::TinyTDS::Dataset
- Sequel::TinyTDS::Dataset::ArgumentMapper
- Sequel::TinyTDS::Dataset::PreparedStatementMethods
- Sequel::ToDot
- Sequel::ToDot::DatasetMethods
- Sequel::UnbindDuplicate
- Sequel::Unbinder
- Sequel::UndefinedAssociation
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# Sequel::Model::Associations::ClassMethods

Each kind of association adds a number of instance methods to the model class which are specialized according to the association type and optional parameters given in the definition. Example:

    class Project < Sequel::Model
      many_to_one :portfolio
      # or: one_to_one :portfolio
      one_to_many :milestones
      # or: many_to_many :milestones
    end

The project class now has the following instance methods:

portfolio | Returns the associated portfolio.
portfolio=(obj) | Sets the associated portfolio to the object, but the change is not persisted until you save the record (for many_to_one associations).
portfolio_dataset | Returns a dataset that would return the associated portfolio, only useful in fairly specific circumstances.
milestones | Returns an array of associated milestones
add_milestone(obj) | Associates the passed milestone with this object.
remove_milestone(obj) | Removes the association with the passed milestone.
remove_all_milestones | Removes associations with all associated milestones.
milestones_dataset | Returns a dataset that would return the associated milestones, allowing for further filtering/limiting/etc.

If you want to override the behavior of the add_/remove_/remove_all_/ methods or the association setter method, use the :adder, :remover, :clearer, and/or :setter options. These options override the default behavior.

By default the classes for the associations are inferred from the association name, so for example the Project#portfolio will return an instance of Portfolio, and Project#milestones will return an array of Milestone instances. You can use the :class option to change which class is used.

Association definitions are also reflected by the class, e.g.:

    Project.associations
    => [:portfolio, :milestones]
    Project.association_reflection(:portfolio)
    => {:type => :many_to_one, :name => :portfolio, ...}

Associations should not have the same names as any of the columns in the model's current table they reference. If you are dealing with an existing schema that has a column named status, you can't name the association status, you'd have to name it foo_status or something else. If you give an association the same name as a column, you will probably end up with an association that doesn't work, or a SystemStackError.

For a more in depth general overview, as well as a reference guide, see the Association Basics guide. For examples of advanced usage, see the Advanced Associations guide.

### Attributes

association_reflections[R]

All association reflections defined for this model (default: {}).

default_eager_limit_strategy[RW]

The default :eager_limit_strategy option to use for *_many associations (default: nil)

### Public Instance Methods

all_association_reflections() click to toggle source

Array of all association reflections for this model class

    # File lib/sequel/model/associations.rb, line 734
    def all_association_reflections
      association_reflections.values
    end

apply_association_dataset_opts(opts, ds) click to toggle source

Given an association reflection and a dataset, apply the :select, :conditions, :order, :eager, :distinct, and :eager_block association options to the given dataset and return the dataset or a modified copy of it.

    # File lib/sequel/model/associations.rb, line 742
    def apply_association_dataset_opts(opts, ds)
      ds = ds.select(*opts.select) if opts.select
      if c = opts[:conditions]
        ds = (c.is_a?(Array) && !Sequel.condition_specifier?(c)) ? ds.where(*c) : ds.where(c)
      end
      ds = ds.order(*opts[:order]) if opts[:order]
      ds = ds.eager(opts[:eager]) if opts[:eager]
      ds = ds.distinct if opts[:distinct]
      ds = opts[:eager_block].call(ds) if opts[:eager_block]
      ds
    end

associate(type, name, opts = {}, &block) click to toggle source

Associates a related model with the current model. The following types are supported:

:many_to_one | Foreign key in current model's table points to associated model's primary key. Each associated model object can be associated with more than one current model objects. Each current model object can be associated with only one associated model object.
:one_to_many | Foreign key in associated model's table points to this model's primary key. Each current model object can be associated with more than one associated model objects. Each associated model object can be associated with only one current model object.
:one_to_one | Similar to one_to_many in terms of foreign keys, but only one object is associated to the current object through the association. The methods created are similar to many_to_one, except that the one_to_one setter method saves the passed object.
:many_to_many | A join table is used that has a foreign key that points to this model's primary key and a foreign key that points to the associated model's primary key. Each current model object can be associated with many associated model objects, and each associated model object can be associated with many current model objects.

The following options can be supplied:

### Multiple Types

:adder | Proc used to define the private add* method for doing the database work to associate the given object to the current object (*_to_many assocations).
:after_add | Symbol, Proc, or array of both/either specifying a callback to call after a new item is added to the association.
:after_load | Symbol, Proc, or array of both/either specifying a callback to call after the associated record(s) have been retrieved from the database.
:after_remove | Symbol, Proc, or array of both/either specifying a callback to call after an item is removed from the association.
:after_set | Symbol, Proc, or array of both/either specifying a callback to call after an item is set using the association setter method.
:allow_eager | If set to false, you cannot load the association eagerly via eager or eager_graph
:before_add | Symbol, Proc, or array of both/either specifying a callback to call before a new item is added to the association.
:before_remove | Symbol, Proc, or array of both/either specifying a callback to call before an item is removed from the association.
:before_set | Symbol, Proc, or array of both/either specifying a callback to call before an item is set using the association setter method.
:cartesian_product_number | the number of joins completed by this association that could cause more than one row for each row in the current table (default: 0 for many_to_one and one_to_one associations, 1 for one_to_many and many_to_many associations).
:class | The associated class or its name as a string or symbol. If not given, uses the association's name, which is camelized (and singularized unless the type is :many_to_one or :one_to_one). If this is specified as a string or symbol, you must specify the full class name (e.g. "SomeModule::MyModel").
:clearer | Proc used to define the private remove_all* method for doing the database work to remove all objects associated to the current object (*_to_many assocations).
:clone | Merge the current options and block into the options and block used in defining the given association. Can be used to DRY up a bunch of similar associations that all share the same options such as :class and :key, while changing the order and block used.
:conditions | The conditions to use to filter the association, can be any argument passed to where.
:dataset | A proc that is instance_execed to get the base dataset to use (before the other options are applied). If the proc accepts an argument, it is passed the related association reflection.
:distinct | Use the DISTINCT clause when selecting associating object, both when lazy loading and eager loading via .eager (but not when using .eager_graph).
:eager | The associations to eagerly load via `eager` when loading the associated object(s).
:eager_block | If given, use the block instead of the default block when eagerly loading. To not use a block when eager loading (when one is used normally), set to nil.
:eager_graph | The associations to eagerly load via `eager_graph` when loading the associated object(s). many_to_many associations with this option cannot be eagerly loaded via `eager`.
:eager_grapher | A proc to use to implement eager loading via `eager_graph`, overriding the default. Takes an options hash with the entries :self (the receiver of the eager_graph call), :table_alias (the alias to use for table to graph into the association), :implicit_qualifier (the alias that was used for the current table), and possibly :eager_block (a callback proc accepting the associated dataset, for per-call customization). Should return a copy of the dataset with the association graphed into it.
:eager_limit_strategy | Determines the strategy used for enforcing limits when eager loading associations via the `eager` method. For one_to_one associations, no strategy is used by default, and for *_many associations, the :ruby strategy is used by default, which still retrieves all records but slices the resulting array after the association is retrieved. You can pass a `true` value for this option to have Sequel pick what it thinks is the best choice for the database, or specify a specific symbol to manually select a strategy. one_to_one associations support :distinct_on and :window_function. *_many associations support :ruby, and :window_function.
:eager_loader | A proc to use to implement eager loading, overriding the default. Takes a single hash argument, with at least the keys: :rows, which is an array of current model instances, :associations, which is a hash of dependent associations, :self, which is the dataset doing the eager loading, :eager_block, which is a dynamic callback that should be called with the dataset, and :id_map, which is a mapping of key values to arrays of current model instances. In the proc, the associated records should be queried from the database and the associations cache for each record should be populated.
:eager_loader_key | A symbol for the key column to use to populate the key_hash for the eager loader. Can be set to nil to not populate the key_hash.
:extend | A module or array of modules to extend the dataset with.
:graph_alias_base | The base name to use for the table alias when eager graphing. Defaults to the name of the association. If the alias name has already been used in the query, Sequel will create a unique alias by appending a numeric suffix (e.g. alias_0, alias_1, ...) until the alias is unique.
:graph_block | The block to pass to join_table when eagerly loading the association via `eager_graph`.
:graph_conditions | The additional conditions to use on the SQL join when eagerly loading the association via `eager_graph`. Should be a hash or an array of two element arrays. If not specified, the :conditions option is used if it is a hash or array of two element arrays.
:graph_join_type | The type of SQL join to use when eagerly loading the association via eager_graph. Defaults to :left_outer.
:graph_only_conditions | The conditions to use on the SQL join when eagerly loading the association via `eager_graph`, instead of the default conditions specified by the foreign/primary keys. This option causes the :graph_conditions option to be ignored.
:graph_select | A column or array of columns to select from the associated table when eagerly loading the association via `eager_graph`. Defaults to all columns in the associated table.
:limit | Limit the number of records to the provided value. Use an array with two elements for the value to specify a limit (first element) and an offset (second element).
:methods_module | The module that methods the association creates will be placed into. Defaults to the module containing the model's columns.
:order | the column(s) by which to order the association dataset. Can be a singular column symbol or an array of column symbols.
:order_eager_graph | Whether to add the association's order to the graphed dataset's order when graphing via `eager_graph`. Defaults to true, so set to false to disable.
:read_only | Do not add a setter method (for many_to_one or one_to_one associations), or add_/remove_/remove_all_ methods (for one_to_many and many_to_many associations).
:reciprocal | the symbol name of the reciprocal association, if it exists. By default, Sequel will try to determine it by looking at the associated model's assocations for a association that matches the current association's key(s). Set to nil to not use a reciprocal.
:remover | Proc used to define the private remove* method for doing the database work to remove the association between the given object and the current object (*_to_many assocations).
:select | the columns to select. Defaults to the associated class's table_name.* in a many_to_many association, which means it doesn't include the attributes from the join table. If you want to include the join table attributes, you can use this option, but beware that the join table attributes can clash with attributes from the model table, so you should alias any attributes that have the same name in both the join table and the associated table.
:setter | Proc used to define the private _*= method for doing the work to setup the assocation between the given object and the current object (*_to_one associations).
:validate | Set to false to not validate when implicitly saving any associated object.

### :many_to_one

:key | foreign key in current model's table that references associated model's primary key, as a symbol. Defaults to :"#{name}_id". Can use an array of symbols for a composite key association.
:key_column | Similar to, and usually identical to, :key, but :key refers to the model method to call, where :key_column refers to the underlying column. Should only be used if the the model method differs from the foreign key column, in conjunction with defining a model alias method for the key column.
:primary_key | column in the associated table that :key option references, as a symbol. Defaults to the primary key of the associated table. Can use an array of symbols for a composite key association.
:primary_key_method | the method symbol or array of method symbols to call on the associated object to get the foreign key values. Defaults to :primary_key option.
:qualify | Whether to use qualifier primary keys when loading the association. The default is true, so you must set to false to not qualify. Qualification rarely causes problems, but it's necessary to disable in some cases, such as when you are doing a JOIN USING operation on the column on Oracle.

### :one_to_many and :one_to_one

:key | foreign key in associated model's table that references current model's primary key, as a symbol. Defaults to :"#{self.name.underscore}_id". Can use an array of symbols for a composite key association.
:key_method | the method symbol or array of method symbols to call on the associated object to get the foreign key values. Defaults to :key option.
:primary_key | column in the current table that :key option references, as a symbol. Defaults to primary key of the current table. Can use an array of symbols for a composite key association.
:primary_key_column | Similar to, and usually identical to, :primary_key, but :primary_key refers to the model method call, where :primary_key_column refers to the underlying column. Should only be used if the the model method differs from the primary key column, in conjunction with defining a model alias method for the primary key column.

### :many_to_many

:graph_join_table_block | The block to pass to `join_table` for the join table when eagerly loading the association via `eager_graph`.
:graph_join_table_conditions | The additional conditions to use on the SQL join for the join table when eagerly loading the association via `eager_graph`. Should be a hash or an array of two element arrays.
:graph_join_table_join_type | The type of SQL join to use for the join table when eagerly loading the association via `eager_graph`. Defaults to the :graph_join_type option or :left_outer.
:graph_join_table_only_conditions | The conditions to use on the SQL join for the join table when eagerly loading the association via `eager_graph`, instead of the default conditions specified by the foreign/primary keys. This option causes the :graph_join_table_conditions option to be ignored.
:join_table | name of table that includes the foreign keys to both the current model and the associated model, as a symbol. Defaults to the name of current model and name of associated model, pluralized, underscored, sorted, and joined with '_'.
:join_table_block | proc that can be used to modify the dataset used in the add/remove/remove_all methods. Should accept a dataset argument and return a modified dataset if present.
:left_key | foreign key in join table that points to current model's primary key, as a symbol. Defaults to :"#{self.name.underscore}_id". Can use an array of symbols for a composite key association.
:left_primary_key | column in current table that :left_key points to, as a symbol. Defaults to primary key of current table. Can use an array of symbols for a composite key association.
:left_primary_key_column | Similar to, and usually identical to, :left_primary_key, but :left_primary_key refers to the model method to call, where :left_primary_key_column refers to the underlying column. Should only be used if the model method differs from the left primary key column, in conjunction with defining a model alias method for the left primary key column.
:right_key | foreign key in join table that points to associated model's primary key, as a symbol. Defaults to :"#{name.to_s.singularize}_id". Can use an array of symbols for a composite key association.
:right_primary_key | column in associated table that :right_key points to, as a symbol. Defaults to primary key of the associated table. Can use an array of symbols for a composite key association.
:right_primary_key_method | the method symbol or array of method symbols to call on the associated object to get the foreign key values for the join table. Defaults to :right_primary_key option.
:uniq | Adds a after_load callback that makes the array of objects unique.

    # File lib/sequel/model/associations.rb, line 958
    def associate(type, name, opts = {}, &block)
      if opts[:one_to_one] && type == :one_to_many
        Sequel::Deprecation.deprecate('Raising an Error when the one_to_many type uses the :one_to_one option', "Use the one_to_one associationtype")
        raise(Error, 'one_to_many association type with :one_to_one option removed, used one_to_one association type')
      end
      raise(Error, 'invalid association type') unless assoc_class = ASSOCIATION_TYPES[type]
      raise(Error, 'Model.associate name argument must be a symbol') unless name.is_a?(Symbol)
      raise(Error, ':eager_loader option must have an arity of 1 or 3') if opts[:eager_loader] && ![1, 3].include?(opts[:eager_loader].arity)
      raise(Error, ':eager_grapher option must have an arity of 1 or 3') if opts[:eager_grapher] && ![1, 3].include?(opts[:eager_grapher].arity)

      Sequel::Deprecation.deprecate('The :eager_loader association option accepting 3 arguments', "Please switch to accepting a single options hash") if opts[:eager_loader] && opts[:eager_loader].arity == 3
      Sequel::Deprecation.deprecate('The :eager_grapher association option accepting 3 arguments', "Please switch to accepting a single options hash") if opts[:eager_grapher] && opts[:eager_grapher].arity == 3

      # dup early so we don't modify opts
      orig_opts = opts.dup
      if opts[:clone]
        cloned_assoc = association_reflection(opts[:clone])
        raise(Error, "cannot clone an association to an association of different type (association #{name} with type #{type} cloning #{opts[:clone]} with type #{cloned_assoc[:type]})") unless cloned_assoc[:type] == type || [cloned_assoc[:type], type].all?{|t| [:one_to_many, :one_to_one].include?(t)}
        orig_opts = cloned_assoc[:orig_opts].merge(orig_opts)
      end
      opts = orig_opts.merge(:type => type, :name => name, :cache=>{}, :model => self)
      opts[:block] = block if block
      opts = assoc_class.new.merge!(opts)
      opts[:eager_block] = block unless opts.include?(:eager_block)
      if !opts.has_key?(:predicate_key) && opts.has_key?(:eager_loading_predicate_key)
        opts[:predicate_key] = opts[:eager_loading_predicate_key]
      end
      opts[:graph_join_type] ||= :left_outer
      opts[:order_eager_graph] = true unless opts.include?(:order_eager_graph)
      conds = opts[:conditions]
      opts[:graph_alias_base] ||= name
      opts[:graph_conditions] = conds if !opts.include?(:graph_conditions) and Sequel.condition_specifier?(conds)
      opts[:graph_conditions] = opts.fetch(:graph_conditions, []).to_a
      opts[:graph_select] = Array(opts[:graph_select]) if opts[:graph_select]
      [:before_add, :before_remove, :after_add, :after_remove, :after_load, :before_set, :after_set, :extend].each do |cb_type|
        opts[cb_type] = Array(opts[cb_type])
      end
      late_binding_class_option(opts, opts.returns_array? ? singularize(name) : name)

      # Remove :class entry if it exists and is nil, to work with cached_fetch
      opts.delete(:class) unless opts[:class]

      send(:"def_#{type}", opts)

      orig_opts.delete(:clone)
      orig_opts.merge!(:class_name=>opts[:class_name], :class=>opts[:class], :block=>block)
      opts[:orig_opts] = orig_opts
      # don't add to association_reflections until we are sure there are no errors
      association_reflections[name] = opts
    end

association_reflection(name) click to toggle source

The association reflection hash for the association of the given name.

    # File lib/sequel/model/associations.rb, line 1010
    def association_reflection(name)
      association_reflections[name]
    end

associations() click to toggle source

Array of association name symbols

    # File lib/sequel/model/associations.rb, line 1015
    def associations
      association_reflections.keys
    end

eager_loading_dataset(opts, ds, select, associations, eager_options={}) click to toggle source

Modify and return eager loading dataset based on association options.

    # File lib/sequel/model/associations.rb, line 1020
    def eager_loading_dataset(opts, ds, select, associations, eager_options={})
      ds = apply_association_dataset_opts(opts, ds)
      ds = ds.select(*select) if select
      if opts[:eager_graph]
        raise(Error, "cannot eagerly load a #{opts[:type]} association that uses :eager_graph") if opts.eager_loading_use_associated_key?
        ds = ds.eager_graph(opts[:eager_graph])
      end
      ds = ds.eager(associations) unless Array(associations).empty?
      ds = eager_options[:eager_block].call(ds) if eager_options[:eager_block]
      if opts.eager_loading_use_associated_key?
        ds = if opts[:uses_left_composite_keys]
          ds.select_append(*opts.associated_key_alias.zip(opts.predicate_keys).map{|a, k| SQL::AliasedExpression.new(k, a)})
        else
          ds.select_append(SQL::AliasedExpression.new(opts.predicate_key, opts.associated_key_alias))
        end
      end
      ds
    end

many_to_many(name, opts={}, &block) click to toggle source

Shortcut for adding a many_to_many association, see associate

    # File lib/sequel/model/associations.rb, line 1040
    def many_to_many(name, opts={}, &block)
      associate(:many_to_many, name, opts, &block)
    end

many_to_one(name, opts={}, &block) click to toggle source

Shortcut for adding a many_to_one association, see associate

    # File lib/sequel/model/associations.rb, line 1045
    def many_to_one(name, opts={}, &block)
      associate(:many_to_one, name, opts, &block)
    end

one_to_many(name, opts={}, &block) click to toggle source

Shortcut for adding a one_to_many association, see associate

    # File lib/sequel/model/associations.rb, line 1050
    def one_to_many(name, opts={}, &block)
      associate(:one_to_many, name, opts, &block)
    end

one_to_one(name, opts={}, &block) click to toggle source

Shortcut for adding a one_to_one association, see associate.

    # File lib/sequel/model/associations.rb, line 1055
    def one_to_one(name, opts={}, &block)
      associate(:one_to_one, name, opts, &block)
    end

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