assign_nested_attributes_for_collection_association(association_name, attributes_collection, assignment_opts = {})
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 }
])
Show source
def assign_nested_attributes_for_collection_association(association_name, attributes_collection, assignment_opts = {})
options = self.nested_attributes_options[association_name]
unless attributes_collection.is_a?(Hash) || attributes_collection.is_a?(Array)
raise ArgumentError, "Hash or Array expected, got #{attributes_collection.class.name} (#{attributes_collection.inspect})"
end
if options[:limit] && attributes_collection.size > options[:limit]
raise TooManyRecords, "Maximum #{options[:limit]} records are allowed. Got #{attributes_collection.size} records instead."
end
if attributes_collection.is_a? Hash
keys = attributes_collection.keys
attributes_collection = if keys.include?('id') || keys.include?(:id)
Array.wrap(attributes_collection)
else
attributes_collection.values
end
end
association = association(association_name)
existing_records = if association.loaded?
association.target
else
attribute_ids = attributes_collection.map {|a| a['id'] || a[:id] }.compact
attribute_ids.empty? ? [] : association.scoped.where(association.klass.primary_key => attribute_ids)
end
attributes_collection.each do |attributes|
attributes = attributes.with_indifferent_access
if attributes['id'].blank?
unless reject_new_record?(association_name, attributes)
association.build(attributes.except(*unassignable_keys(assignment_opts)), assignment_opts)
end
elsif existing_record = existing_records.detect { |record| record.id.to_s == attributes['id'].to_s }
unless association.loaded? || call_reject_if(association_name, attributes)
target_record = association.target.detect { |record| record == existing_record }
if target_record
existing_record = target_record
else
association.add_to_target(existing_record)
end
end
if !call_reject_if(association_name, attributes)
assign_to_or_mark_for_destruction(existing_record, attributes, options[:allow_destroy], assignment_opts)
end
elsif assignment_opts[:without_protection]
association.build(attributes.except(*unassignable_keys(assignment_opts)), assignment_opts)
else
raise_nested_attributes_record_not_found(association_name, attributes['id'])
end
end
end