method
fields_for_with_nested_attributes

v2.3.8 -
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Class: ActionView::Helpers::FormBuilder
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fields_for_with_nested_attributes(association_name, args, block)
private
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# File actionpack/lib/action_view/helpers/form_helper.rb, line 1070 def fields_for_with_nested_attributes(association_name, args, block) name = "#{object_name}[#{association_name}_attributes]" association = args.first if association.respond_to?(:new_record?) association = [association] if @object.send(association_name).is_a?(Array) elsif !association.is_a?(Array) association = @object.send(association_name) end if association.is_a?(Array) explicit_child_index = args.last[:child_index] if args.last.is_a?(Hash) association.map do |child| fields_for_nested_model("#{name}[#{explicit_child_index || nested_child_index(name)}]", child, args, block) end.join elsif association fields_for_nested_model(name, association, args, block) end end