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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Fields filtering with include","articleBody":"Version `0.9.12`\n\nWhen using `fields[events]=name` + `include=establishment` the key `relationships` disappear from the response hash. \n\nBasic association is `events belongs_to establishment`\n\nIssue is coming from here:\n\n```ruby\n\n# JSONAPI::ResourceSerializer#supplying_relationship_fields\n\ndef supplying_relationship_fields(resource_klass)\n        @_supplying_relationship_fields.fetch resource_klass do\n          relationships = Set.new(resource_klass._relationships.keys.map(\u0026:to_sym))\n          cur = resource_klass\n          while cur != JSONAPI::Resource\n            if @fields.has_key?(cur._type)\n              # here... \n              # It always empty the Set\n              #relationships \u0026= @fields[cur._type]\n              break\n            end\n            cur = cur.superclass\n          end\n          @_supplying_relationship_fields[resource_klass] = relationships\n        end\n      end\n```\n\nCommenting `relationships \u0026= @fields[cur._type]` solves this issue. @DavidMikeSimon could you describe your mind here? I know it was a [loooong time ago](https://github.com/cerebris/jsonapi-resources/blame/6a10162ada6f2b020db418520b674c2c3af948f6/lib/jsonapi/resource_serializer.rb) but your help might help to correctly fix this issue. ","author":{"url":"https://github.com/brcebn","@type":"Person","name":"brcebn"},"datePublished":"2025-09-22T13:57:26.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/1475/jsonapi-resources/issues/1475"}