Class | Sequel::Model
In: | lib/sequel/model.rb lib/sequel/model/errors.rb lib/sequel/model/associations.rb lib/sequel/model/base.rb
Parent: | Object

`Sequel::Model` is an object relational mapper built on top of Sequel core. Each model class is backed by a dataset instance, and many dataset methods can be called directly on the class. Model datasets return rows as model instances, which have fairly standard ORM instance behavior.

`Sequel::Model` is built completely out of plugins. Plugins can override any class, instance, or dataset method defined by a previous plugin and call super to get the default behavior. By default, `Sequel::Model` loads two plugins, `Sequel::Model` (which is itself a plugin) for the base support, and `Sequel::Model::Associations` for the associations support.

You can set the `SEQUEL_NO_ASSOCIATIONS` constant or environment variable to make Sequel not load the associations plugin by default.

### Included Modules

Metaprogramming

### Classes and Modules

Module Sequel::Model::Associations
Module Sequel::Model::ClassMethods
Module Sequel::Model::DatasetMethods
Module Sequel::Model::InstanceMethods
Class Sequel::Model::Errors

### Constants

ANONYMOUS_MODEL_CLASSES | = | {} |  | Map that stores model classes created with `Sequel::Model()`, to allow the reopening of classes when dealing with code reloading.
DATASET_METHODS | = | (Dataset::ACTION_METHODS + Dataset::QUERY_METHODS + [:eager, :eager_graph, :each_page, :each_server, :print]) - [:and, :or, :[], :[]=, :columns, :columns!] |  | Class methods added to model that call the method of the same name on the dataset
EMPTY_INSTANCE_VARIABLES | = | [:@overridable_methods_module, :@db] |  | Class instance variables to set to nil when a subclass is created, for -w compliance
BOOLEAN_SETTINGS | = | [:typecast_empty_string_to_nil, :typecast_on_assignment, :strict_param_setting, \ :raise_on_save_failure, :raise_on_typecast_failure, :require_modification, :use_after_commit_rollback, :use_transactions] |  | Boolean settings that can be modified at the global, class, or instance level.
BEFORE_HOOKS | = | [:before_create, :before_update, :before_save, :before_destroy, :before_validation] |  | Hooks that are called before an action. Can return false to not do the action. When overriding these, it is recommended to call `super` as the last line of your method, so later hooks are called before earlier hooks.
AFTER_HOOKS | = | [:after_initialize, :after_create, :after_update, :after_save, :after_destroy, :after_validation, :after_commit, :after_rollback, :after_destroy_commit, :after_destroy_rollback] |  | Hooks that are called after an action. When overriding these, it is recommended to call `super` on the first line of your method, so later hooks are called after earlier hooks.
AROUND_HOOKS | = | [:around_create, :around_update, :around_save, :around_destroy, :around_validation] |  | Hooks that are called around an action. If overridden, these methods must call super exactly once if the behavior they wrap is desired. The can be used to rescue exceptions raised by the code they wrap or ensure that some behavior is executed no matter what.
HOOKS | = | BEFORE_HOOKS + AFTER_HOOKS |  | Empty instance methods to create that the user can override to get hook/callback behavior. Just like any other method defined by Sequel, if you override one of these, you should call `super` to get the default behavior (while empty by default, they can also be defined by plugins). See the "Model Hooks" guide for more detail on hooks.
INHERITED_INSTANCE_VARIABLES | = | {:@allowed_columns=>:dup, :@dataset_methods=>:dup, :@dataset_method_modules=>:dup, :@primary_key=>nil, :@use_transactions=>nil, :@raise_on_save_failure=>nil, :@require_modification=>nil, :@restricted_columns=>:dup, :@restrict_primary_key=>nil, :@simple_pk=>nil, :@simple_table=>nil, :@strict_param_setting=>nil, :@typecast_empty_string_to_nil=>nil, :@typecast_on_assignment=>nil, :@raise_on_typecast_failure=>nil, :@plugins=>:dup, :@setter_methods=>nil, :@use_after_commit_rollback=>nil, :@fast_pk_lookup_sql=>nil, :@fast_instance_delete_sql=>nil} |  | Class instance variables that are inherited in subclasses. If the value is `:dup`, dup is called on the superclass‘s instance variable when creating the instance variable in the subclass. If the value is `nil`, the superclass‘s instance variable is used directly in the subclass.
NORMAL_METHOD_NAME_REGEXP | = | /\A[A-Za-z_][A-Za-z0-9_]*\z/ |  | Regular expression that determines if a method name is normal in the sense that it could be used literally in ruby code without using send. Used to avoid problems when using eval with a string to define methods.
SETTER_METHOD_REGEXP | = | /=\z/ |  | Regular expression that determines if the method is a valid setter name (i.e. it ends with =).
RESTRICTED_SETTER_METHODS | = | instance_methods.map{|x| x.to_s}.grep(SETTER_METHOD_REGEXP) |  | The setter methods (methods ending with =) that are never allowed to be called automatically via `set`/`update`/`new`/etc..

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