method

to_form_params

v6.1.7.7 - Show latest stable - Class: ActionView::Helpers::UrlHelper

to_form_params(attribute, namespace = nil)

private

Returns an array of hashes each containing :name and :value keys suitable for use as the names and values of form input fields:

to_form_params(name: 'David', nationality: 'Danish')
# => [{name: 'name', value: 'David'}, {name: 'nationality', value: 'Danish'}]

to_form_params(country: { name: 'Denmark' })
# => [{name: 'country[name]', value: 'Denmark'}]

to_form_params(countries: ['Denmark', 'Sweden']})
# => [{name: 'countries[]', value: 'Denmark'}, {name: 'countries[]', value: 'Sweden'}]

An optional namespace can be passed to enclose key names:

to_form_params({ name: 'Denmark' }, 'country')
# => [{name: 'country[name]', value: 'Denmark'}]

# File actionview/lib/action_view/helpers/url_helper.rb, line 756
        def to_form_params(attribute, namespace = nil)
          attribute = if attribute.respond_to?(:permitted?)
            attribute.to_h
          else
            attribute
          end

          params = []
          case attribute
          when Hash
            attribute.each do |key, value|
              prefix = namespace ? "#{namespace}[#{key}]" : key
              params.push(*to_form_params(value, prefix))
            end
          when Array
            array_prefix = "#{namespace}[]"
            attribute.each do |value|
              params.push(*to_form_params(value, array_prefix))
            end
          else
            params << { name: namespace.to_s, value: attribute.to_param }
          end

          params.sort_by { |pair| pair[:name] }
        end

to_form_params

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