Warn on missing inverse relationships

lib/jsonapi/active_relation_retrieval.rb

@@ -304,10 +304,10 @@ def find_included_fragments(source_fragments, relationship, options)
       end
 
       def find_related_fragments_from_inverse(source, source_relationship, options, connect_source_identity)
-        relationship = source_relationship.resource_klass._relationship(source_relationship.inverse_relationship)
-        raise "missing inverse relationship" unless relationship.present?
+        inverse_relationship = source_relationship._inverse_relationship
+        return {} if inverse_relationship.blank?
 
-        parent_resource_klass = relationship.resource_klass
+        parent_resource_klass = inverse_relationship.resource_klass
 
         include_directives = options.fetch(:include_directives, {})
 
@@ -332,7 +332,7 @@ def find_related_fragments_from_inverse(source, source_relationship, options, co
         end
 
         join_manager = ActiveRelation::JoinManager.new(resource_klass: self,
-                                                       source_relationship: relationship,
+                                                       source_relationship: inverse_relationship,
                                                        relationships: linkage_relationships.collect(&:name),
                                                        sort_criteria: sort_criteria,
                                                        filters: filters)
@@ -352,7 +352,7 @@ def find_related_fragments_from_inverse(source, source_relationship, options, co
         if options[:cache]
           # This alias is going to be resolve down to the model's table name and will not actually be an alias
           resource_table_alias = self._table_name
-          parent_table_alias = join_manager.join_details_by_relationship(relationship)[:alias]
+          parent_table_alias = join_manager.join_details_by_relationship(inverse_relationship)[:alias]
 
           pluck_fields = [
             sql_field_with_alias(resource_table_alias, self._primary_key),
@@ -400,7 +400,7 @@ def find_related_fragments_from_inverse(source, source_relationship, options, co
             fragments[rid].add_related_from(parent_rid)
 
             if connect_source_identity
-              fragments[rid].add_related_identity(relationship.name, parent_rid)
+              fragments[rid].add_related_identity(inverse_relationship.name, parent_rid)
             end
 
             attributes_offset = 2
@@ -452,7 +452,7 @@ def find_related_fragments_from_inverse(source, source_relationship, options, co
             end
           end
 
-          parent_table_alias = join_manager.join_details_by_relationship(relationship)[:alias]
+          parent_table_alias = join_manager.join_details_by_relationship(inverse_relationship)[:alias]
           source_field = sql_field_with_fixed_alias(parent_table_alias, parent_resource_klass._primary_key, "jr_source_id")
 
           records = records.select(concat_table_field(_table_name, Arel.star), source_field)
@@ -471,7 +471,7 @@ def find_related_fragments_from_inverse(source, source_relationship, options, co
             parent_rid = JSONAPI::ResourceIdentity.new(parent_resource_klass, resource._model.attributes['jr_source_id'])
 
             if connect_source_identity
-              fragments[rid].add_related_identity(relationship.name, parent_rid)
+              fragments[rid].add_related_identity(inverse_relationship.name, parent_rid)
             end
 
             fragments[rid].add_related_from(parent_rid)
@@ -503,15 +503,16 @@ def count_related(source, relationship, options = {})
       end
 
       def count_related_from_inverse(source_resource, source_relationship, options = {})
-        relationship = source_relationship.resource_klass._relationship(source_relationship.inverse_relationship)
+        inverse_relationship = source_relationship._inverse_relationship
+        return -1 if inverse_relationship.blank?
 
-        related_klass = relationship.resource_klass
+        related_klass = inverse_relationship.resource_klass
 
         filters = options.fetch(:filters, {})
 
         # Joins in this case are related to the related_klass
         join_manager = ActiveRelation::JoinManager.new(resource_klass: self,
-                                                       source_relationship: relationship,
+                                                       source_relationship: inverse_relationship,
                                                        filters: filters)
 
         records = apply_request_settings_to_records(records: records(options),
@@ -521,7 +522,7 @@ def count_related_from_inverse(source_resource, source_relationship, options = {
                                                     filters: filters,
                                                     options: options)
 
-        related_alias = join_manager.join_details_by_relationship(relationship)[:alias]
+        related_alias = join_manager.join_details_by_relationship(inverse_relationship)[:alias]
 
         records = records.select(Arel.sql("#{concat_table_field(related_alias, related_klass._primary_key)}"))
 

lib/jsonapi/active_relation_retrieval_v09.rb

@@ -287,7 +287,9 @@ def load_resources_to_fragments(fragments, related_resources, source_resource, s
           if source_resource
             source_resource.add_related_identity(source_relationship.name, related_resource.identity)
             fragment.add_related_from(source_resource.identity)
-            fragment.add_related_identity(source_relationship.inverse_relationship, source_resource.identity)
+
+            inverse_relationship = source_relationship._inverse_relationship
+            fragment.add_related_identity(inverse_relationship.name, source_resource.identity) if inverse_relationship.present?
           end
         end
       end

lib/jsonapi/active_relation_retrieval_v10.rb

@@ -464,10 +464,8 @@ def find_related_monomorphic_fragments(source_fragments, relationship, options,
           end
 
           if connect_source_identity
-            related_relationship = resource_klass._relationship(relationship.inverse_relationship)
-            if related_relationship
-              fragments[rid].add_related_identity(related_relationship.name, source_rid)
-            end
+            inverse_relationship = relationship._inverse_relationship
+            fragments[rid].add_related_identity(inverse_relationship.name, source_rid) if inverse_relationship``.present?
           end
         end
 
@@ -598,10 +596,8 @@ def find_related_polymorphic_fragments(source_fragments, relationship, options,
             related_fragments[rid].add_related_from(source_rid)
 
             if connect_source_identity
-              related_relationship = related_klass._relationship(relationship.inverse_relationship)
-              if related_relationship
-                related_fragments[rid].add_related_identity(related_relationship.name, source_rid)
-              end
+              inverse_relationship = relationship._inverse_relationship
+              related_fragments[rid].add_related_identity(inverse_relationship.name, source_rid) if inverse_relationship.present?
             end
 
             relation_position = relation_positions[row[2].underscore.pluralize]

lib/jsonapi/configuration.rb

@@ -14,6 +14,8 @@ class Configuration
                 :warn_on_missing_routes,
                 :warn_on_performance_issues,
                 :warn_on_eager_loading_disabled,
+                :warn_on_missing_relationships,
+                :raise_on_missing_relationships,
                 :default_allow_include_to_one,
                 :default_allow_include_to_many,
                 :allow_sort,
@@ -69,6 +71,11 @@ def initialize
       self.warn_on_missing_routes = true
       self.warn_on_performance_issues = true
       self.warn_on_eager_loading_disabled = true
+      self.warn_on_missing_relationships = true
+      # If this is set to true an error will be raised if a resource is found to be missing a relationship
+      # If this is set to false a warning will be logged (see warn_on_missing_relationships) and related resouces for
+      # this relationship will not be included in the response.
+      self.raise_on_missing_relationships = false
 
       # :none, :offset, :paged, or a custom paginator name
       self.default_paginator = :none
@@ -330,6 +337,10 @@ def allow_include=(allow_include)
 
     attr_writer :warn_on_eager_loading_disabled
 
+    attr_writer :warn_on_missing_relationships
+
+    attr_writer :raise_on_missing_relationships
+
     attr_writer :use_relationship_reflection
 
     attr_writer :resource_cache

lib/jsonapi/link_builder.rb

@@ -34,7 +34,7 @@ def primary_resources_url
         @primary_resources_url_cached ||= "#{ base_url }#{ engine_mount_point }#{ primary_resources_path }"
       else
         if JSONAPI.configuration.warn_on_missing_routes && !@primary_resource_klass._warned_missing_route
-          warn "primary_resources_url for #{@primary_resource_klass} could not be generated"
+          warn "primary_resources_url for #{@primary_resource_klass.name} could not be generated"
           @primary_resource_klass._warned_missing_route = true
         end
         nil
@@ -54,7 +54,7 @@ def relationships_related_link(source, relationship, query_params = {})
         url
       else
         if JSONAPI.configuration.warn_on_missing_routes && !relationship._warned_missing_route
-          warn "related_link for #{relationship} could not be generated"
+          warn "related_link for #{relationship.display_name} could not be generated"
           relationship._warned_missing_route = true
         end
         nil
@@ -66,7 +66,7 @@ def relationships_self_link(source, relationship)
         "#{ self_link(source) }/relationships/#{ route_for_relationship(relationship) }"
       else
         if JSONAPI.configuration.warn_on_missing_routes && !relationship._warned_missing_route
-          warn "self_link for #{relationship} could not be generated"
+          warn "self_link for #{relationship.display_name} could not be generated"
           relationship._warned_missing_route = true
         end
         nil
@@ -78,7 +78,7 @@ def self_link(source)
         resource_url(source)
       else
         if JSONAPI.configuration.warn_on_missing_routes && !source.class._warned_missing_route
-          warn "self_link for #{source.class} could not be generated"
+          warn "self_link for #{source.class.name} could not be generated"
           source.class._warned_missing_route = true
         end
         nil

lib/jsonapi/relationship.rb

@@ -9,7 +9,7 @@ class Relationship
 
     attr_writer :allow_include
 
-    attr_accessor :_routed, :_warned_missing_route
+    attr_accessor :_routed, :_warned_missing_route, :_warned_missing_inverse_relationship
 
     def initialize(name, options = {})
       @name = name.to_s
@@ -47,6 +47,7 @@ def initialize(name, options = {})
 
       @_routed = false
       @_warned_missing_route = false
+      @_warned_missing_inverse_relationship = false
 
       exclude_links(options.fetch(:exclude_links, JSONAPI.configuration.default_exclude_links))
 
@@ -162,6 +163,22 @@ def _relation_name
       @relation_name || @name
     end
 
+    def to_s
+      display_name
+    end
+
+    def _inverse_relationship
+      @inverse_relationship_klass ||= self.resource_klass._relationship(self.inverse_relationship)
+      if @inverse_relationship_klass.blank?
+        message = "Missing inverse relationship detected for: #{self}"
+        warn message if JSONAPI.configuration.warn_on_missing_relationships && !@_warned_missing_inverse_relationship
+        @_warned_missing_inverse_relationship = true
+
+        raise message if JSONAPI.configuration.raise_on_missing_relationships
+      end
+      @inverse_relationship_klass
+    end
+
     class ToOne < Relationship
       attr_reader :foreign_key_on
 
@@ -182,9 +199,9 @@ def initialize(name, options = {})
         @polymorphic_type_relationship_for = options[:polymorphic_type_relationship_for]
       end
 
-      def to_s
+      def display_name
         # :nocov: useful for debugging
-        "#{parent_resource}.#{name}(#{belongs_to? ? 'BelongsToOne' : 'ToOne'})"
+        "#{parent_resource.name}.#{name}(#{belongs_to? ? 'BelongsToOne' : 'ToOne'})"
         # :nocov:
       end
 
@@ -247,9 +264,9 @@ def initialize(name, options = {})
         # end
       end
 
-      def to_s
+      def display_name
         # :nocov: useful for debugging
-        "#{parent_resource_klass}.#{name}(ToMany)"
+        "#{parent_resource.name}.#{name}(ToMany)"
         # :nocov:
       end
 

lib/jsonapi/resource_identity.rb

@@ -58,7 +58,7 @@ def <=>(other_identity)
     # Creates a string representation of the identifier.
     def to_s
       # :nocov:
-      "#{resource_klass}:#{id}"
+      "#{resource_klass.name}:#{id}"
       # :nocov:
     end
   end

test/unit/serializer/link_builder_test.rb

@@ -248,7 +248,7 @@ def test_relationships_related_link_not_routed
       link = builder.relationships_related_link(source, relationship)
       assert_nil link
     end
-    assert_equal(err, "related_link for Api::Secret::PostResource.author(BelongsToOne) could not be generated\n")
+    assert_equal("related_link for Api::Secret::PostResource.author(BelongsToOne) could not be generated\n", err)
 
     # should only warn once
     builder = JSONAPI::LinkBuilder.new(config)