method
assign_nested_attributes_for_collection_association
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Class: ActiveRecord::NestedAttributes
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assign_nested_attributes_for_collection_association(association_name, attributes_collection)
private
Assigns the given attributes to the collection association.
Hashes with an :id value matching an existing associated record will update that record. Hashes without an :id value will build a new record for the association. Hashes with a matching :id value and a :_destroy key set to a truthy value will mark the matched record for destruction.
For example:
assign_nested_attributes_for_collection_association(:people, { '1' => { id: '1', name: 'Peter' }, '2' => { name: 'John' }, '3' => { id: '2', _destroy: true } })
Will update the name of the Person with ID 1, build a new associated person with the name ‘John’, and mark the associated Person with ID 2 for destruction.
Also accepts an Array of attribute hashes:
assign_nested_attributes_for_collection_association(:people, [ { id: '1', name: 'Peter' }, { name: 'John' }, { id: '2', _destroy: true } ])