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Action Dispatch Routing PolymorphicRoutes ↑

Polymorphic URL helpers are methods for smart resolution to a named route call when given an Active Record model instance. They are to be used in combination with ActionController::Resources.

These methods are useful when you want to generate the correct URL or path to a RESTful resource without having to know the exact type of the record in question.

Nested resources and/or namespaces are also supported, as illustrated in the example:

polymorphic_url([:admin, @article, @comment])

results in:

admin_article_comment_url(@article, @comment)

Usage within the framework ↑

Polymorphic URL helpers are used in a number of places throughout the Rails framework:

Prefixed polymorphic helpers ↑

In addition to polymorphic_url and polymorphic_path methods, a number of prefixed helpers are available as a shorthand to action: "..." in options. Those are:

Example usage:

edit_polymorphic_path(@post)           # => "/posts/1/edit"
polymorphic_path(@post, format: :pdf)  # => "/posts/1.pdf"

Usage with mounted engines ↑

If you are using a mounted engine and you need to use a polymorphic_url pointing at the engine’s routes, pass in the engine’s route proxy as the first argument to the method. For example:

polymorphic_url([blog, @post])  # calls blog.post_path(@post)
form_with(model: [blog, @post]) # => "/blog/posts/1"
Methods
E
N
P

Instance Public methods

edit_polymorphic_path(record_or_hash, options = {})

Source: show | on GitHub 

# File actionpack/lib/action_dispatch/routing/polymorphic_routes.rb, line 164
      def edit_polymorphic_path(record_or_hash, options = {}) = polymorphic_path_for_action("edit", record_or_hash, options)
      def new_polymorphic_url(record_or_hash, options = {}) = polymorphic_url_for_action("new", record_or_hash, options)
      def new_polymorphic_path(record_or_hash, options = {}) = polymorphic_path_for_action("new", record_or_hash, options)

      private
        def polymorphic_url_for_action(action, record_or_hash, options)
          if options.empty? && !(Hash === record_or_hash) && !polymorphic_mapping(record_or_hash)
            # What polymorphic_url does with action: as the only option.
            HelperMethodBuilder.polymorphic_method(self, record_or_hash, action, :url, options)
          else
            polymorphic_url(record_or_hash, options.merge(action: action))
          end
        end

        def polymorphic_path_for_action(action, record_or_hash, options)
          if options.empty? && !(Hash === record_or_hash) && !polymorphic_mapping(record_or_hash)
            # What polymorphic_path does with action: as the only option.
            HelperMethodBuilder.polymorphic_method(self, record_or_hash, action, :path, options)
          else
            polymorphic_path(record_or_hash, options.merge(action: action))
          end
        end

        def polymorphic_mapping(record)
          if record.respond_to?(:to_model)
            _routes.polymorphic_mappings[record.to_model.model_name.name]
          else
            _routes.polymorphic_mappings[record.class.name]
          end
        end

        class HelperMethodBuilder # :nodoc:
          CACHE = { path: {}, url: {} }.freeze

          def self.get(action, type)
            type = type.to_sym
            CACHE[type].fetch(action) { build action, type }
          end

          def self.url;  CACHE[:url][nil]; end
          def self.path; CACHE[:path][nil]; end

          def self.build(action, type)
            prefix = action ? "#{action}_" : ""
            suffix = type
            if action.to_s == "new"
              HelperMethodBuilder.singular prefix, suffix
            else
              HelperMethodBuilder.plural prefix, suffix
            end
          end

          def self.singular(prefix, suffix)
            new(->(name) { name.singular_route_key }, prefix, suffix)
          end

          def self.plural(prefix, suffix)
            new(->(name) { name.route_key }, prefix, suffix)
          end

          def self.polymorphic_method(recipient, record_or_hash_or_array, action, type, options)
            builder = get action, type

            case record_or_hash_or_array
            when Array
              record_or_hash_or_array = record_or_hash_or_array.compact
              if record_or_hash_or_array.empty?
                raise ArgumentError, "Nil location provided. Can't build URI."
              end
              if record_or_hash_or_array.first.is_a?(ActionDispatch::Routing::RoutesProxy)
                recipient = record_or_hash_or_array.shift
              end

              method, args = builder.handle_list record_or_hash_or_array
            when String, Symbol
              method, args = builder.handle_string record_or_hash_or_array
            when Class
              method, args = builder.handle_class record_or_hash_or_array

            when nil
              raise ArgumentError, "Nil location provided. Can't build URI."
            else
              return builder.dispatch_model(recipient, record_or_hash_or_array, options.empty? ? nil : options)
            end

            if options.empty?
              recipient.public_send(method, *args)
            else
              recipient.public_send(method, *args, options)
            end
          end

          attr_reader :suffix, :prefix

          def initialize(key_strategy, prefix, suffix)
            @key_strategy = key_strategy
            @prefix       = prefix
            @suffix       = suffix
            @method_names_key = :"action_dispatch_polymorphic_#{prefix}#{suffix}_method_names"
          end

          def handle_string(record)
            [get_method_for_string(record), []]
          end

          def handle_string_call(target, str)
            target.public_send get_method_for_string str
          end

          def handle_class(klass)
            [get_method_for_class(klass), []]
          end

          def handle_class_call(target, klass)
            target.public_send get_method_for_class klass
          end

          def handle_model_call(target, record)
            if mapping = polymorphic_mapping(target, record)
              mapping.call(target, [record], suffix == "path")
            else
              dispatch_model(target, record)
            end
          end

          # Calls the named route helper for a model straight away, rather
          # than building an argument list and a pair for the caller to splat
          # apart again.
          def dispatch_model(target, record, options = nil)
            model = record.to_model

            if model.persisted?
              method = get_method_for_string(model.model_name.singular_route_key)
              options ? target.public_send(method, model, options) : target.public_send(method, model)
            else
              method = get_method_for_class(model)
              options ? target.public_send(method, options) : target.public_send(method)
            end
          end

          # Takes ownership of +list+, a copy made by the caller.
          def handle_list(list)
            record = list.pop

            args = []
            named_route = prefix.dup

            list.each do |parent|
              named_route <<
                case parent
                when Symbol
                  parent.name
                when String
                  raise(ArgumentError, "Please use symbols for polymorphic route arguments.")
                when Class
                  args << parent
                  parent.model_name.singular_route_key
                else
                  args << parent.to_model
                  parent.to_model.model_name.singular_route_key
                end
              named_route << "_"
            end

            named_route <<
              case record
              when Symbol
                record.name
              when String
                raise(ArgumentError, "Please use symbols for polymorphic route arguments.")
              when Class
                @key_strategy.call record.model_name
              else
                model = record.to_model
                if model.persisted?
                  args << model
                  model.model_name.singular_route_key
                else
                  @key_strategy.call model.model_name
                end
              end

            named_route << "_" << suffix.to_s
            [named_route, args]
          end

          private
            def polymorphic_mapping(target, record)
              if record.respond_to?(:to_model)
                target._routes.polymorphic_mappings[record.to_model.model_name.name]
              else
                target._routes.polymorphic_mappings[record.class.name]
              end
            end

            def get_method_for_class(klass)
              name = @key_strategy.call klass.model_name
              get_method_for_string name
            end

            def get_method_for_string(str)
              names = method_names
              names[str] || names.compute_if_absent(-str.to_s) { -"#{prefix}#{str}_#{suffix}" }
            end

            # Builders are frozen and shared across Ractors (see the make_shareable
            # call below), so the per-builder memo lives in Ractor-local storage.
            def method_names
              ActiveSupport::Ractors.store_if_absent(@method_names_key) { Concurrent::Map.new }
            end

            [nil, "new", "edit"].each do |action|
              CACHE[:url][action]  = build action, "url"
              CACHE[:path][action] = build action, "path"
            end
            ActiveSupport::Ractors.make_shareable(CACHE)
        end
    end
  end
end

edit_polymorphic_url(record_or_hash, options = {})

Source: show | on GitHub 

# File actionpack/lib/action_dispatch/routing/polymorphic_routes.rb, line 163
    def edit_polymorphic_url(record_or_hash, options = {}) = polymorphic_url_for_action("edit", record_or_hash, options)
    def edit_polymorphic_path(record_or_hash, options = {}) = polymorphic_path_for_action("edit", record_or_hash, options)
    def new_polymorphic_url(record_or_hash, options = {}) = polymorphic_url_for_action("new", record_or_hash, options)
    def new_polymorphic_path(record_or_hash, options = {}) = polymorphic_path_for_action("new", record_or_hash, options)

    private
      def polymorphic_url_for_action(action, record_or_hash, options)
        if options.empty? && !(Hash === record_or_hash) && !polymorphic_mapping(record_or_hash)
          # What polymorphic_url does with action: as the only option.
          HelperMethodBuilder.polymorphic_method(self, record_or_hash, action, :url, options)
        else
          polymorphic_url(record_or_hash, options.merge(action: action))
        end
      end

      def polymorphic_path_for_action(action, record_or_hash, options)
        if options.empty? && !(Hash === record_or_hash) && !polymorphic_mapping(record_or_hash)
          # What polymorphic_path does with action: as the only option.
          HelperMethodBuilder.polymorphic_method(self, record_or_hash, action, :path, options)
        else
          polymorphic_path(record_or_hash, options.merge(action: action))
        end
      end

      def polymorphic_mapping(record)
        if record.respond_to?(:to_model)
          _routes.polymorphic_mappings[record.to_model.model_name.name]
        else
          _routes.polymorphic_mappings[record.class.name]
        end
      end

      class HelperMethodBuilder # :nodoc:
        CACHE = { path: {}, url: {} }.freeze

        def self.get(action, type)
          type = type.to_sym
          CACHE[type].fetch(action) { build action, type }
        end

        def self.url;  CACHE[:url][nil]; end
        def self.path; CACHE[:path][nil]; end

        def self.build(action, type)
          prefix = action ? "#{action}_" : ""
          suffix = type
          if action.to_s == "new"
            HelperMethodBuilder.singular prefix, suffix
          else
            HelperMethodBuilder.plural prefix, suffix
          end
        end

        def self.singular(prefix, suffix)
          new(->(name) { name.singular_route_key }, prefix, suffix)
        end

        def self.plural(prefix, suffix)
          new(->(name) { name.route_key }, prefix, suffix)
        end

        def self.polymorphic_method(recipient, record_or_hash_or_array, action, type, options)
          builder = get action, type

          case record_or_hash_or_array
          when Array
            record_or_hash_or_array = record_or_hash_or_array.compact
            if record_or_hash_or_array.empty?
              raise ArgumentError, "Nil location provided. Can't build URI."
            end
            if record_or_hash_or_array.first.is_a?(ActionDispatch::Routing::RoutesProxy)
              recipient = record_or_hash_or_array.shift
            end

            method, args = builder.handle_list record_or_hash_or_array
          when String, Symbol
            method, args = builder.handle_string record_or_hash_or_array
          when Class
            method, args = builder.handle_class record_or_hash_or_array

          when nil
            raise ArgumentError, "Nil location provided. Can't build URI."
          else
            return builder.dispatch_model(recipient, record_or_hash_or_array, options.empty? ? nil : options)
          end

          if options.empty?
            recipient.public_send(method, *args)
          else
            recipient.public_send(method, *args, options)
          end
        end

        attr_reader :suffix, :prefix

        def initialize(key_strategy, prefix, suffix)
          @key_strategy = key_strategy
          @prefix       = prefix
          @suffix       = suffix
          @method_names_key = :"action_dispatch_polymorphic_#{prefix}#{suffix}_method_names"
        end

        def handle_string(record)
          [get_method_for_string(record), []]
        end

        def handle_string_call(target, str)
          target.public_send get_method_for_string str
        end

        def handle_class(klass)
          [get_method_for_class(klass), []]
        end

        def handle_class_call(target, klass)
          target.public_send get_method_for_class klass
        end

        def handle_model_call(target, record)
          if mapping = polymorphic_mapping(target, record)
            mapping.call(target, [record], suffix == "path")
          else
            dispatch_model(target, record)
          end
        end

        # Calls the named route helper for a model straight away, rather
        # than building an argument list and a pair for the caller to splat
        # apart again.
        def dispatch_model(target, record, options = nil)
          model = record.to_model

          if model.persisted?
            method = get_method_for_string(model.model_name.singular_route_key)
            options ? target.public_send(method, model, options) : target.public_send(method, model)
          else
            method = get_method_for_class(model)
            options ? target.public_send(method, options) : target.public_send(method)
          end
        end

        # Takes ownership of +list+, a copy made by the caller.
        def handle_list(list)
          record = list.pop

          args = []
          named_route = prefix.dup

          list.each do |parent|
            named_route <<
              case parent
              when Symbol
                parent.name
              when String
                raise(ArgumentError, "Please use symbols for polymorphic route arguments.")
              when Class
                args << parent
                parent.model_name.singular_route_key
              else
                args << parent.to_model
                parent.to_model.model_name.singular_route_key
              end
            named_route << "_"
          end

          named_route <<
            case record
            when Symbol
              record.name
            when String
              raise(ArgumentError, "Please use symbols for polymorphic route arguments.")
            when Class
              @key_strategy.call record.model_name
            else
              model = record.to_model
              if model.persisted?
                args << model
                model.model_name.singular_route_key
              else
                @key_strategy.call model.model_name
              end
            end

          named_route << "_" << suffix.to_s
          [named_route, args]
        end

        private
          def polymorphic_mapping(target, record)
            if record.respond_to?(:to_model)
              target._routes.polymorphic_mappings[record.to_model.model_name.name]
            else
              target._routes.polymorphic_mappings[record.class.name]
            end
          end

          def get_method_for_class(klass)
            name = @key_strategy.call klass.model_name
            get_method_for_string name
          end

          def get_method_for_string(str)
            names = method_names
            names[str] || names.compute_if_absent(-str.to_s) { -"#{prefix}#{str}_#{suffix}" }
          end

          # Builders are frozen and shared across Ractors (see the make_shareable
          # call below), so the per-builder memo lives in Ractor-local storage.
          def method_names
            ActiveSupport::Ractors.store_if_absent(@method_names_key) { Concurrent::Map.new }
          end

          [nil, "new", "edit"].each do |action|
            CACHE[:url][action]  = build action, "url"
            CACHE[:path][action] = build action, "path"
          end
          ActiveSupport::Ractors.make_shareable(CACHE)
      end
  end
end

new_polymorphic_path(record_or_hash, options = {})

Source: show | on GitHub 

# File actionpack/lib/action_dispatch/routing/polymorphic_routes.rb, line 166
  def new_polymorphic_path(record_or_hash, options = {}) = polymorphic_path_for_action("new", record_or_hash, options)

  private
    def polymorphic_url_for_action(action, record_or_hash, options)
      if options.empty? && !(Hash === record_or_hash) && !polymorphic_mapping(record_or_hash)
        # What polymorphic_url does with action: as the only option.
        HelperMethodBuilder.polymorphic_method(self, record_or_hash, action, :url, options)
      else
        polymorphic_url(record_or_hash, options.merge(action: action))
      end
    end

    def polymorphic_path_for_action(action, record_or_hash, options)
      if options.empty? && !(Hash === record_or_hash) && !polymorphic_mapping(record_or_hash)
        # What polymorphic_path does with action: as the only option.
        HelperMethodBuilder.polymorphic_method(self, record_or_hash, action, :path, options)
      else
        polymorphic_path(record_or_hash, options.merge(action: action))
      end
    end

    def polymorphic_mapping(record)
      if record.respond_to?(:to_model)
        _routes.polymorphic_mappings[record.to_model.model_name.name]
      else
        _routes.polymorphic_mappings[record.class.name]
      end
    end

    class HelperMethodBuilder # :nodoc:
      CACHE = { path: {}, url: {} }.freeze

      def self.get(action, type)
        type = type.to_sym
        CACHE[type].fetch(action) { build action, type }
      end

      def self.url;  CACHE[:url][nil]; end
      def self.path; CACHE[:path][nil]; end

      def self.build(action, type)
        prefix = action ? "#{action}_" : ""
        suffix = type
        if action.to_s == "new"
          HelperMethodBuilder.singular prefix, suffix
        else
          HelperMethodBuilder.plural prefix, suffix
        end
      end

      def self.singular(prefix, suffix)
        new(->(name) { name.singular_route_key }, prefix, suffix)
      end

      def self.plural(prefix, suffix)
        new(->(name) { name.route_key }, prefix, suffix)
      end

      def self.polymorphic_method(recipient, record_or_hash_or_array, action, type, options)
        builder = get action, type

        case record_or_hash_or_array
        when Array
          record_or_hash_or_array = record_or_hash_or_array.compact
          if record_or_hash_or_array.empty?
            raise ArgumentError, "Nil location provided. Can't build URI."
          end
          if record_or_hash_or_array.first.is_a?(ActionDispatch::Routing::RoutesProxy)
            recipient = record_or_hash_or_array.shift
          end

          method, args = builder.handle_list record_or_hash_or_array
        when String, Symbol
          method, args = builder.handle_string record_or_hash_or_array
        when Class
          method, args = builder.handle_class record_or_hash_or_array

        when nil
          raise ArgumentError, "Nil location provided. Can't build URI."
        else
          return builder.dispatch_model(recipient, record_or_hash_or_array, options.empty? ? nil : options)
        end

        if options.empty?
          recipient.public_send(method, *args)
        else
          recipient.public_send(method, *args, options)
        end
      end

      attr_reader :suffix, :prefix

      def initialize(key_strategy, prefix, suffix)
        @key_strategy = key_strategy
        @prefix       = prefix
        @suffix       = suffix
        @method_names_key = :"action_dispatch_polymorphic_#{prefix}#{suffix}_method_names"
      end

      def handle_string(record)
        [get_method_for_string(record), []]
      end

      def handle_string_call(target, str)
        target.public_send get_method_for_string str
      end

      def handle_class(klass)
        [get_method_for_class(klass), []]
      end

      def handle_class_call(target, klass)
        target.public_send get_method_for_class klass
      end

      def handle_model_call(target, record)
        if mapping = polymorphic_mapping(target, record)
          mapping.call(target, [record], suffix == "path")
        else
          dispatch_model(target, record)
        end
      end

      # Calls the named route helper for a model straight away, rather
      # than building an argument list and a pair for the caller to splat
      # apart again.
      def dispatch_model(target, record, options = nil)
        model = record.to_model

        if model.persisted?
          method = get_method_for_string(model.model_name.singular_route_key)
          options ? target.public_send(method, model, options) : target.public_send(method, model)
        else
          method = get_method_for_class(model)
          options ? target.public_send(method, options) : target.public_send(method)
        end
      end

      # Takes ownership of +list+, a copy made by the caller.
      def handle_list(list)
        record = list.pop

        args = []
        named_route = prefix.dup

        list.each do |parent|
          named_route <<
            case parent
            when Symbol
              parent.name
            when String
              raise(ArgumentError, "Please use symbols for polymorphic route arguments.")
            when Class
              args << parent
              parent.model_name.singular_route_key
            else
              args << parent.to_model
              parent.to_model.model_name.singular_route_key
            end
          named_route << "_"
        end

        named_route <<
          case record
          when Symbol
            record.name
          when String
            raise(ArgumentError, "Please use symbols for polymorphic route arguments.")
          when Class
            @key_strategy.call record.model_name
          else
            model = record.to_model
            if model.persisted?
              args << model
              model.model_name.singular_route_key
            else
              @key_strategy.call model.model_name
            end
          end

        named_route << "_" << suffix.to_s
        [named_route, args]
      end

      private
        def polymorphic_mapping(target, record)
          if record.respond_to?(:to_model)
            target._routes.polymorphic_mappings[record.to_model.model_name.name]
          else
            target._routes.polymorphic_mappings[record.class.name]
          end
        end

        def get_method_for_class(klass)
          name = @key_strategy.call klass.model_name
          get_method_for_string name
        end

        def get_method_for_string(str)
          names = method_names
          names[str] || names.compute_if_absent(-str.to_s) { -"#{prefix}#{str}_#{suffix}" }
        end

        # Builders are frozen and shared across Ractors (see the make_shareable
        # call below), so the per-builder memo lives in Ractor-local storage.
        def method_names
          ActiveSupport::Ractors.store_if_absent(@method_names_key) { Concurrent::Map.new }
        end

        [nil, "new", "edit"].each do |action|
          CACHE[:url][action]  = build action, "url"
          CACHE[:path][action] = build action, "path"
        end
        ActiveSupport::Ractors.make_shareable(CACHE)
    end
end

new_polymorphic_url(record_or_hash, options = {})

Source: show | on GitHub 

# File actionpack/lib/action_dispatch/routing/polymorphic_routes.rb, line 165
    def new_polymorphic_url(record_or_hash, options = {}) = polymorphic_url_for_action("new", record_or_hash, options)
    def new_polymorphic_path(record_or_hash, options = {}) = polymorphic_path_for_action("new", record_or_hash, options)

    private
      def polymorphic_url_for_action(action, record_or_hash, options)
        if options.empty? && !(Hash === record_or_hash) && !polymorphic_mapping(record_or_hash)
          # What polymorphic_url does with action: as the only option.
          HelperMethodBuilder.polymorphic_method(self, record_or_hash, action, :url, options)
        else
          polymorphic_url(record_or_hash, options.merge(action: action))
        end
      end

      def polymorphic_path_for_action(action, record_or_hash, options)
        if options.empty? && !(Hash === record_or_hash) && !polymorphic_mapping(record_or_hash)
          # What polymorphic_path does with action: as the only option.
          HelperMethodBuilder.polymorphic_method(self, record_or_hash, action, :path, options)
        else
          polymorphic_path(record_or_hash, options.merge(action: action))
        end
      end

      def polymorphic_mapping(record)
        if record.respond_to?(:to_model)
          _routes.polymorphic_mappings[record.to_model.model_name.name]
        else
          _routes.polymorphic_mappings[record.class.name]
        end
      end

      class HelperMethodBuilder # :nodoc:
        CACHE = { path: {}, url: {} }.freeze

        def self.get(action, type)
          type = type.to_sym
          CACHE[type].fetch(action) { build action, type }
        end

        def self.url;  CACHE[:url][nil]; end
        def self.path; CACHE[:path][nil]; end

        def self.build(action, type)
          prefix = action ? "#{action}_" : ""
          suffix = type
          if action.to_s == "new"
            HelperMethodBuilder.singular prefix, suffix
          else
            HelperMethodBuilder.plural prefix, suffix
          end
        end

        def self.singular(prefix, suffix)
          new(->(name) { name.singular_route_key }, prefix, suffix)
        end

        def self.plural(prefix, suffix)
          new(->(name) { name.route_key }, prefix, suffix)
        end

        def self.polymorphic_method(recipient, record_or_hash_or_array, action, type, options)
          builder = get action, type

          case record_or_hash_or_array
          when Array
            record_or_hash_or_array = record_or_hash_or_array.compact
            if record_or_hash_or_array.empty?
              raise ArgumentError, "Nil location provided. Can't build URI."
            end
            if record_or_hash_or_array.first.is_a?(ActionDispatch::Routing::RoutesProxy)
              recipient = record_or_hash_or_array.shift
            end

            method, args = builder.handle_list record_or_hash_or_array
          when String, Symbol
            method, args = builder.handle_string record_or_hash_or_array
          when Class
            method, args = builder.handle_class record_or_hash_or_array

          when nil
            raise ArgumentError, "Nil location provided. Can't build URI."
          else
            return builder.dispatch_model(recipient, record_or_hash_or_array, options.empty? ? nil : options)
          end

          if options.empty?
            recipient.public_send(method, *args)
          else
            recipient.public_send(method, *args, options)
          end
        end

        attr_reader :suffix, :prefix

        def initialize(key_strategy, prefix, suffix)
          @key_strategy = key_strategy
          @prefix       = prefix
          @suffix       = suffix
          @method_names_key = :"action_dispatch_polymorphic_#{prefix}#{suffix}_method_names"
        end

        def handle_string(record)
          [get_method_for_string(record), []]
        end

        def handle_string_call(target, str)
          target.public_send get_method_for_string str
        end

        def handle_class(klass)
          [get_method_for_class(klass), []]
        end

        def handle_class_call(target, klass)
          target.public_send get_method_for_class klass
        end

        def handle_model_call(target, record)
          if mapping = polymorphic_mapping(target, record)
            mapping.call(target, [record], suffix == "path")
          else
            dispatch_model(target, record)
          end
        end

        # Calls the named route helper for a model straight away, rather
        # than building an argument list and a pair for the caller to splat
        # apart again.
        def dispatch_model(target, record, options = nil)
          model = record.to_model

          if model.persisted?
            method = get_method_for_string(model.model_name.singular_route_key)
            options ? target.public_send(method, model, options) : target.public_send(method, model)
          else
            method = get_method_for_class(model)
            options ? target.public_send(method, options) : target.public_send(method)
          end
        end

        # Takes ownership of +list+, a copy made by the caller.
        def handle_list(list)
          record = list.pop

          args = []
          named_route = prefix.dup

          list.each do |parent|
            named_route <<
              case parent
              when Symbol
                parent.name
              when String
                raise(ArgumentError, "Please use symbols for polymorphic route arguments.")
              when Class
                args << parent
                parent.model_name.singular_route_key
              else
                args << parent.to_model
                parent.to_model.model_name.singular_route_key
              end
            named_route << "_"
          end

          named_route <<
            case record
            when Symbol
              record.name
            when String
              raise(ArgumentError, "Please use symbols for polymorphic route arguments.")
            when Class
              @key_strategy.call record.model_name
            else
              model = record.to_model
              if model.persisted?
                args << model
                model.model_name.singular_route_key
              else
                @key_strategy.call model.model_name
              end
            end

          named_route << "_" << suffix.to_s
          [named_route, args]
        end

        private
          def polymorphic_mapping(target, record)
            if record.respond_to?(:to_model)
              target._routes.polymorphic_mappings[record.to_model.model_name.name]
            else
              target._routes.polymorphic_mappings[record.class.name]
            end
          end

          def get_method_for_class(klass)
            name = @key_strategy.call klass.model_name
            get_method_for_string name
          end

          def get_method_for_string(str)
            names = method_names
            names[str] || names.compute_if_absent(-str.to_s) { -"#{prefix}#{str}_#{suffix}" }
          end

          # Builders are frozen and shared across Ractors (see the make_shareable
          # call below), so the per-builder memo lives in Ractor-local storage.
          def method_names
            ActiveSupport::Ractors.store_if_absent(@method_names_key) { Concurrent::Map.new }
          end

          [nil, "new", "edit"].each do |action|
            CACHE[:url][action]  = build action, "url"
            CACHE[:path][action] = build action, "path"
          end
          ActiveSupport::Ractors.make_shareable(CACHE)
      end
  end
end

polymorphic_mapping(record)

Source: show | on GitHub 

# File actionpack/lib/action_dispatch/routing/polymorphic_routes.rb, line 187
def polymorphic_mapping(record)
  if record.respond_to?(:to_model)
    _routes.polymorphic_mappings[record.to_model.model_name.name]
  else
    _routes.polymorphic_mappings[record.class.name]
  end
end

polymorphic_path(record_or_hash_or_array, options = {})

Returns the path component of a URL for the given record.

Source: show | on GitHub 

# File actionpack/lib/action_dispatch/routing/polymorphic_routes.rb, line 137
def polymorphic_path(record_or_hash_or_array, options = {})
  if Hash === record_or_hash_or_array
    options = record_or_hash_or_array.merge(options)
    record  = options.delete :id
    return polymorphic_path record, options
  end

  if mapping = polymorphic_mapping(record_or_hash_or_array)
    return mapping.call(self, [record_or_hash_or_array, options], true)
  end

  if options.empty?
    opts, action = options, nil
  else
    opts   = options.dup
    action = opts.delete :action
  end
  type = :path

  HelperMethodBuilder.polymorphic_method self,
                                         record_or_hash_or_array,
                                         action,
                                         type,
                                         opts
end

polymorphic_path_for_action(action, record_or_hash, options)

Source: show | on GitHub 

# File actionpack/lib/action_dispatch/routing/polymorphic_routes.rb, line 178
def polymorphic_path_for_action(action, record_or_hash, options)
  if options.empty? && !(Hash === record_or_hash) && !polymorphic_mapping(record_or_hash)
    # What polymorphic_path does with action: as the only option.
    HelperMethodBuilder.polymorphic_method(self, record_or_hash, action, :path, options)
  else
    polymorphic_path(record_or_hash, options.merge(action: action))
  end
end

polymorphic_url(record_or_hash_or_array, options = {})

Constructs a call to a named RESTful route for the given record and returns the resulting URL string. For example:

# calls post_url(post)
polymorphic_url(post) # => "http://example.com/posts/1"
polymorphic_url([blog, post]) # => "http://example.com/blogs/1/posts/1"
polymorphic_url([:admin, blog, post]) # => "http://example.com/admin/blogs/1/posts/1"
polymorphic_url([user, :blog, post]) # => "http://example.com/users/1/blog/posts/1"
polymorphic_url(Comment) # => "http://example.com/comments"

Options ↑

  • :action - Specifies the action prefix for the named route: :new or :edit. Default is no prefix.

  • :routing_type - Allowed values are :path or :url. Default is :url.

Also includes all the options from url_for. These include such things as :anchor or :trailing_slash. Example usage is given below:

polymorphic_url([blog, post], anchor: 'my_anchor')
  # => "http://example.com/blogs/1/posts/1#my_anchor"
polymorphic_url([blog, post], anchor: 'my_anchor', script_name: "/my_app")
  # => "http://example.com/my_app/blogs/1/posts/1#my_anchor"

For all of these options, see the documentation for url_for.

Functionality ↑

# an Article record
polymorphic_url(record)  # same as article_url(record)

# a Comment record
polymorphic_url(record)  # same as comment_url(record)

# it recognizes new records and maps to the collection
record = Comment.new
polymorphic_url(record)  # same as comments_url()

# the class of a record will also map to the collection
polymorphic_url(Comment) # same as comments_url()

Source: show | on GitHub 

# File actionpack/lib/action_dispatch/routing/polymorphic_routes.rb, line 110
def polymorphic_url(record_or_hash_or_array, options = {})
  if Hash === record_or_hash_or_array
    options = record_or_hash_or_array.merge(options)
    record  = options.delete :id
    return polymorphic_url record, options
  end

  if mapping = polymorphic_mapping(record_or_hash_or_array)
    return mapping.call(self, [record_or_hash_or_array, options], false)
  end

  if options.empty?
    opts, action, type = options, nil, :url
  else
    opts   = options.dup
    action = opts.delete :action
    type   = opts.delete(:routing_type) || :url
  end

  HelperMethodBuilder.polymorphic_method self,
                                         record_or_hash_or_array,
                                         action,
                                         type,
                                         opts
end

polymorphic_url_for_action(action, record_or_hash, options)

Source: show | on GitHub 

# File actionpack/lib/action_dispatch/routing/polymorphic_routes.rb, line 169
def polymorphic_url_for_action(action, record_or_hash, options)
  if options.empty? && !(Hash === record_or_hash) && !polymorphic_mapping(record_or_hash)
    # What polymorphic_url does with action: as the only option.
    HelperMethodBuilder.polymorphic_method(self, record_or_hash, action, :url, options)
  else
    polymorphic_url(record_or_hash, options.merge(action: action))
  end
end