rename context to serialization_context and add url helpers

lib/action_controller/serialization.rb

@@ -1,4 +1,5 @@
 require 'active_support/core_ext/class/attribute'
+require 'action_controller/serialization/context'
 
 module ActionController
   module Serialization
@@ -46,7 +47,7 @@ module ActionController
 
     [:_render_option_json, :_render_with_renderer_json].each do |renderer_method|
       define_method renderer_method do |resource, options|
-        options.fetch(:context) { options[:context] = request }
+        options.fetch(:serialization_context) { options[:serialization_context] = Context.new(request) }
         serializable_resource = get_serializer(resource, options)
         super(serializable_resource, options)
       end

lib/action_controller/serialization/context.rb

@@ -0,0 +1,13 @@
+module ActionController
+  module Serialization
+    class Context
+      attr_reader :request_url, :query_parameters, :url_helpers
+
+      def initialize(request)
+        @request_url = request.original_url[/\A[^?]+/]
+        @query_parameters = request.query_parameters
+        @url_helpers = ActiveModelSerializers.url_helpers
+      end
+    end
+  end
+end

lib/active_model/serializer/adapter/json_api.rb

@@ -209,7 +209,7 @@ module ActiveModel
         end
 
         def links_for(serializer, options)
-          JsonApi::PaginationLinks.new(serializer.object, options[:context]).serializable_hash(options)
+          JsonApi::PaginationLinks.new(serializer.object, options[:serialization_context]).serializable_hash(options)
         end
       end
     end

lib/active_model/serializer/adapter/json_api/pagination_links.rb

@@ -41,11 +41,11 @@ module ActiveModel
           end
 
           def url(options)
-            @url ||= options.fetch(:links, {}).fetch(:self, nil) || original_url
+            @url ||= options.fetch(:links, {}).fetch(:self, nil) || request_url
           end
 
-          def original_url
+          def request_url
-            @original_url ||= context.original_url[/\A[^?]+/]
+            @request_url ||= context.request_url
           end
 
           def query_parameters

lib/active_model/serializer/railtie.rb

@@ -7,6 +7,18 @@ module ActiveModel
       end
     end
 
+    initializer 'active_model_serializers.url_helpers' do
+      ActiveSupport.on_load(:action_controller) do
+        ActiveModelSerializers.url_helpers = Module.new do
+          include Rails.application.routes.url_helpers
+
+          def self.default_url_options
+            ActionController::Base.default_url_options
+          end
+        end
+      end
+    end
+
     initializer 'generators' do |app|
       app.load_generators
       require 'generators/serializer/resource_override'

lib/active_model_serializers.rb

@@ -7,6 +7,8 @@ module ActiveModelSerializers
   mattr_accessor :logger
   self.logger = Rails.logger || Logger.new(IO::NULL)
 
+  mattr_accessor :url_helpers
+
   extend ActiveSupport::Autoload
   autoload :Model
 

test/adapter/json_api/pagination_links_test.rb

@@ -22,10 +22,10 @@ module ActiveModel
 
           def mock_request(query_parameters = {}, original_url = URI)
             context = Minitest::Mock.new
-            context.expect(:original_url, original_url)
+            context.expect(:request_url, original_url)
             context.expect(:query_parameters, query_parameters)
             @options = {}
-            @options[:context] = context
+            @options[:serialization_context] = context
           end
 
           def load_adapter(paginated_collection, options = {})