Revert "rename context to serialization_context and add url helpers"

lib/active_model/serializer/adapter/json_api.rb

@@ -206,7 +206,7 @@ module ActiveModel
         end
 
         def links_for(serializer, options)
-          JsonApi::PaginationLinks.new(serializer.object, options[:serialization_context]).serializable_hash(options)
+          JsonApi::PaginationLinks.new(serializer.object, options[: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) || request_url
+            @url ||= options.fetch(:links, {}).fetch(:self, nil) || original_url
           end
 
-          def request_url
-            @request_url ||= context.request_url
+          def original_url
+            @original_url ||= context.original_url[/\A[^?]+/]
           end
 
           def query_parameters

lib/active_model/serializer/railtie.rb

@@ -7,18 +7,6 @@ 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'