V0 11 dev performance (#1431)

* Reduce number of string allocations in LinkBuilder

* Consistently access `include_related`

* Remove unused class variable

* Cache `id` after retrieving it from the model

* Cache `module_path`

* Cache resource_klass_for and resource_type_for

* Remove no longer used method _setup_relationship

* Delete nil values without creating a new object

* Rework resource naming for method caches

lib/jsonapi/link_builder.rb

@@ -49,8 +49,8 @@ def query_link(query_params)
 
     def relationships_related_link(source, relationship, query_params = {})
       if relationship._routed
-        url = "#{ self_link(source) }/#{ route_for_relationship(relationship) }"
-        url = "#{ url }?#{ query_params.to_query }" if query_params.present?
+        url = +"#{ self_link(source) }/#{ route_for_relationship(relationship) }"
+        url << "?#{ query_params.to_query }" if query_params.present?
         url
       else
         if JSONAPI.configuration.warn_on_missing_routes && !relationship._warned_missing_route
@@ -129,18 +129,14 @@ def resources_path(source_klass)
       @_resources_path[source_klass] ||= formatted_module_path_from_class(source_klass) + format_route(source_klass._type.to_s)
     end
 
-    def resource_path(source)
+    def resource_url(source)
       if source.class.singleton?
-        resources_path(source.class)
+        "#{ base_url }#{ engine_mount_point }#{ resources_path(source.class) }"
       else
-        "#{resources_path(source.class)}/#{source.id}"
+        "#{ base_url }#{ engine_mount_point }#{resources_path(source.class)}/#{source.id}"
       end
     end
 
-    def resource_url(source)
-      "#{ base_url }#{ engine_mount_point }#{ resource_path(source) }"
-    end
-
     def route_for_relationship(relationship)
       format_route(relationship.name)
     end

lib/jsonapi/resource_common.rb

@@ -39,7 +39,7 @@ def _model
     end
 
     def id
-      _model.public_send(self.class._primary_key)
+      @id ||= _model.public_send(self.class._primary_key)
     end
 
     def identity
@@ -510,7 +510,10 @@ def inherited(subclass)
         subclass._routed = false
         subclass._warned_missing_route = false
 
-        subclass._clear_cached_attribute_options
+        subclass._attribute_options_cache = {}
+        subclass._model_class_to_resource_type_cache = {}
+        subclass._resource_type_to_class_cache = {}
+
         subclass._clear_fields_cache
 
         subclass._resource_retrieval_strategy_loaded = @_resource_retrieval_strategy_loaded
@@ -533,15 +536,19 @@ def rebuild_relationships(relationships)
       end
 
       def resource_klass_for(type)
+        @_resource_type_to_class_cache ||= {}
         type = type.underscore
-        type_with_module = type.start_with?(module_path) ? type : module_path + type
 
-        resource_name = _resource_name_from_type(type_with_module)
-        resource = resource_name.safe_constantize if resource_name
-        if resource.nil?
-          fail NameError, "JSONAPI: Could not find resource '#{type}'. (Class #{resource_name} not found)"
+        @_resource_type_to_class_cache.fetch(type) do
+          type_with_module = type.start_with?(module_path) ? type : module_path + type
+
+          resource_name = _resource_name_from_type(type_with_module)
+          resource_klass = resource_name.safe_constantize if resource_name
+          if resource_klass.nil?
+            fail NameError, "JSONAPI: Could not find resource '#{type}'. (Class #{resource_name} not found)"
+          end
+          @_resource_type_to_class_cache[type] = resource_klass
         end
-        resource
       end
 
       def resource_klass_for_model(model)
@@ -553,17 +560,33 @@ def _resource_name_from_type(type)
       end
 
       def resource_type_for(model)
-        model_name = model.class.to_s.underscore
-        if _model_hints[model_name]
-          _model_hints[model_name]
-        else
-          model_name.rpartition('/').last
+        @_model_class_to_resource_type_cache.fetch(model.class) do
+          model_name = model.class.name.underscore
+
+          resource_type = if _model_hints[model_name]
+                            _model_hints[model_name]
+                          else
+                            model_name.rpartition('/').last
+                          end
+
+          @_model_class_to_resource_type_cache[model.class] = resource_type
         end
       end
 
-      attr_accessor :_attributes, :_relationships, :_type, :_model_hints, :_routed, :_warned_missing_route,
+      attr_accessor :_attributes,
+                    :_relationships,
+                    :_type,
+                    :_model_hints,
+                    :_routed,
+                    :_warned_missing_route,
                     :_resource_retrieval_strategy_loaded
-      attr_writer :_allowed_filters, :_paginator, :_allowed_sort
+
+      attr_writer :_allowed_filters,
+                  :_paginator,
+                  :_allowed_sort,
+                  :_model_class_to_resource_type_cache,
+                  :_resource_type_to_class_cache,
+                  :_attribute_options_cache
 
       def create(context)
         new(create_model, context)
@@ -590,7 +613,7 @@ def attributes(*attrs)
       end
 
       def attribute(attribute_name, options = {})
-        _clear_cached_attribute_options
+        _clear_attribute_options_cache
         _clear_fields_cache
 
         attr = attribute_name.to_sym
@@ -903,7 +926,7 @@ def verify_relationship_filter(filter, raw, _context = nil)
 
       # quasi private class methods
       def _attribute_options(attr)
-        @_cached_attribute_options[attr] ||= default_attribute_options.merge(@_attributes[attr])
+        @_attribute_options_cache[attr] ||= default_attribute_options.merge(@_attributes[attr])
       end
 
       def _attribute_delegated_name(attr)
@@ -915,11 +938,11 @@ def _has_attribute?(attr)
       end
 
       def _updatable_attributes
-        _attributes.map { |key, options| key unless options[:readonly] }.compact
+        _attributes.map { |key, options| key unless options[:readonly] }.delete_if {|v| v.nil? }
       end
 
       def _updatable_relationships
-        @_relationships.map { |key, relationship| key unless relationship.readonly? }.compact
+        @_relationships.map { |key, relationship| key unless relationship.readonly? }.delete_if {|v| v.nil? }
       end
 
       def _relationship(type)
@@ -1132,11 +1155,11 @@ def _has_sort?(sorting)
       end
 
       def module_path
-        if name == 'JSONAPI::Resource'
-          ''
-        else
-          name =~ /::[^:]+\Z/ ? ($`.freeze.gsub('::', '/') + '/').underscore : ''
-        end
+        @module_path ||= if name == 'JSONAPI::Resource'
+                           ''
+                         else
+                           name =~ /::[^:]+\Z/ ? ($`.freeze.gsub('::', '/') + '/').underscore : ''
+                         end
       end
 
       def default_sort
@@ -1169,18 +1192,6 @@ def _add_relationship(klass, *attrs)
         end
       end
 
-      def _setup_relationship(klass, *attrs)
-        _clear_fields_cache
-
-        options = attrs.extract_options!
-        options[:parent_resource] = self
-
-        relationship_name = attrs[0].to_sym
-        check_duplicate_relationship_name(relationship_name)
-
-        define_relationship_methods(relationship_name.to_sym, klass, options)
-      end
-
       # ResourceBuilder methods
       def define_relationship_methods(relationship_name, relationship_klass, options)
         relationship = register_relationship(
@@ -1214,8 +1225,16 @@ def register_relationship(name, relationship_object)
         @_relationships[name] = relationship_object
       end
 
-      def _clear_cached_attribute_options
-        @_cached_attribute_options = {}
+      def _clear_attribute_options_cache
+        @_attribute_options_cache&.clear
+      end
+
+      def _clear_model_to_resource_type_cache
+        @_model_class_to_resource_type_cache&.clear
+      end
+
+      def _clear_resource_type_to_klass_cache
+        @_resource_type_to_class_cache&.clear
       end
 
       def _clear_fields_cache

lib/jsonapi/resource_serializer.rb

@@ -262,7 +262,7 @@ def links_hash(source)
       if !links.key?('self') && !source.class.exclude_link?(:self)
         links['self'] = link_builder.self_link(source)
       end
-      links.compact
+      links.delete_if {|k,v| v.nil? }
     end
 
     def custom_links_hash(source)
@@ -340,7 +340,7 @@ def default_relationship_links(source, relationship)
       links = {}
       links['self'] = self_link(source, relationship) unless relationship.exclude_link?(:self)
       links['related'] = related_link(source, relationship) unless relationship.exclude_link?(:related)
-      links.compact
+      links.delete_if {|k,v| v.nil? }
     end
 
     def to_many_linkage(rids)

lib/jsonapi/resource_tree.rb

@@ -68,13 +68,13 @@ def add_resource(resource, include_related)
     private
 
     def init_included_relationships(fragment, include_related)
-      include_related && include_related.each_key do |relationship_name|
+      include_related&.each_key do |relationship_name|
         fragment.initialize_related(relationship_name)
       end
     end
 
     def load_included(resource_klass, source_resource_tree, include_related, options)
-       include_related.try(:each_key) do |key|
+       include_related&.each_key do |key|
         relationship = resource_klass._relationship(key)
         relationship_name = relationship.name.to_sym
 
@@ -159,7 +159,6 @@ def initialize(parent_relationship, source_resource_tree)
       @related_resource_trees ||= {}
 
       @parent_relationship = parent_relationship
-      @parent_relationship_name = parent_relationship.name.to_sym
       @source_resource_tree = source_resource_tree
     end
 

test/controllers/controller_test.rb

@@ -4028,6 +4028,8 @@ def test_immutable_update_not_supported
 
 class Api::V7::ClientsControllerTest < ActionController::TestCase
   def test_get_namespaced_model_not_matching_resource_using_model_hint
+    Api::V7::ClientResource._clear_model_to_resource_type_cache
+    Api::V7::ClientResource._clear_resource_type_to_klass_cache
     assert_cacheable_get :index
     assert_response :success
     assert_equal 'clients', json_response['data'][0]['type']
@@ -4037,6 +4039,8 @@ def test_get_namespaced_model_not_matching_resource_using_model_hint
 
   def test_get_namespaced_model_not_matching_resource_not_using_model_hint
     Api::V7::ClientResource._model_hints.delete('api/v7/customer')
+    Api::V7::ClientResource._clear_model_to_resource_type_cache
+    Api::V7::ClientResource._clear_resource_type_to_klass_cache
     assert_cacheable_get :index
     assert_response :success
     assert_equal 'customers', json_response['data'][0]['type']