Flowdock
method

assign_nested_attributes_for_collection_association

Importance_2
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 associatied 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 }
  ])
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