Module: Sequel::Plugins::NestedAttributes::ClassMethods

Defined in:
lib/sequel/plugins/nested_attributes.rb

Instance Method Summary collapse

Instance Method Details

#freezeObject

Freeze nested_attributes_module when freezing model class.


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# File 'lib/sequel/plugins/nested_attributes.rb', line 85

def freeze
  @nested_attributes_module.freeze if @nested_attributes_module

  super
end

#nested_attributes(*associations, &block) ⇒ Object

Allow nested attributes to be set for the given associations. Options:

:destroy

Allow destruction of nested records.

:fields

If provided, should be an Array or proc. If it is an array, restricts the fields allowed to be modified through the association_attributes= method to the specific fields given. If it is a proc, it will be called with the associated object and should return an array of the allowable fields.

:limit

For *_to_many associations, a limit on the number of records that will be processed, to prevent denial of service attacks.

:reject_if

A proc that is given each attribute hash before it is passed to its associated object. If the proc returns a truthy value, the attribute hash is ignored.

:remove

Allow disassociation of nested records (can remove the associated object from the parent object, but not destroy the associated object).

:transform

A proc to transform attribute hashes before they are passed to associated object. Takes two arguments, the parent object and the attribute hash. Uses the return value as the new attribute hash.

:unmatched_pk

Specify the action to be taken if a primary key is provided in a record, but it doesn't match an existing associated object. Set to :create to create a new object with that primary key, :ignore to ignore the record, or :raise to raise an error. The default is :raise.

If a block is provided, it is used to set the :reject_if option.


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# File 'lib/sequel/plugins/nested_attributes.rb', line 115

def nested_attributes(*associations, &block)
  include(@nested_attributes_module ||= Module.new) unless @nested_attributes_module
  opts = associations.last.is_a?(Hash) ? associations.pop : {}
  reflections = associations.map{|a| association_reflection(a) || raise(Error, "no association named #{a} for #{self}")}
  reflections.each do |r|
    r[:nested_attributes] = opts
    r[:nested_attributes][:unmatched_pk] ||= :raise
    r[:nested_attributes][:reject_if] ||= block
    def_nested_attribute_method(r)
  end
end