class ActiveModel::EachValidator
EachValidator
is a validator which iterates through the
attributes given in the options hash invoking the
validate_each
method passing in the record, attribute and
value.
All Active Model validations are built on top of this validator.
Attributes
Public Class Methods
Returns a new validator instance. All options will be available via the
options
reader, however the :attributes
option
will be removed and instead be made available through the
attributes
reader.
# File lib/active_model/validator.rb, line 139 def initialize(options) @attributes = Array.wrap(options.delete(:attributes)) raise ":attributes cannot be blank" if @attributes.empty? super check_validity! end
Public Instance Methods
Hook method that gets called by the initializer allowing verification that
the arguments supplied are valid. You could for example raise an
ArgumentError
when invalid options are supplied.
# File lib/active_model/validator.rb, line 166 def check_validity! end
Performs validation on the supplied record. By default this will call
validates_each
to determine validity therefore subclasses
should override validates_each
with validation logic.
# File lib/active_model/validator.rb, line 149 def validate(record) attributes.each do |attribute| value = record.read_attribute_for_validation(attribute) next if (value.nil? && options[:allow_nil]) || (value.blank? && options[:allow_blank]) validate_each(record, attribute, value) end end
Override this method in subclasses with the validation logic, adding errors
to the records errors
array where necessary.
# File lib/active_model/validator.rb, line 159 def validate_each(record, attribute, value) raise NotImplementedError, "Subclasses must implement a validate_each(record, attribute, value) method" end