Getting TypeError - Unable to Clone Symbol: Error while using active_model_serializer
So I have Ruby 2.1.3 with Rails 4.2.0 and I am using the active_model_serializer gem to send correct json data to AngularJs.
I didn't just upgrade today from Rails 4.1.6 to 4.2.0. The issue did not exist in the previous version.
The problem comes when I try to get json from my show show action:
def show
medium = Medium.find(params[:id])
respond_with medium, include: [{comments: :user}, :likes, :user]
end
And this is how the same action looked like before I updated the rails:
def show
medium = Medium.includes([{comments: :user}, :likes, :user]).find(params[:id])
respond_with medium
end
It used to have the ability to work the old way, but with new rails, it doesn't have ActiveModels enabled with the environment anymore in the json data sent.
So, I modified the code using the examples on this page: https://github.com/rails-api/active_model_serializers
This is what the media serializer looks like:
class MediumSerializer < ActiveModel::Serializer
attributes :id,
:text,
:image_video_file_name,
:image_video_croppable_url,
:image_video_thumb_url,
:image_video_big_url
has_one :user
has_many :comments, :likes
end
Before the update, it looked like this:
class MediumSerializer < ActiveModel::Serializer
attributes :id,
:text,
:image_video_file_name,
:image_video_croppable_url,
:image_video_thumb_url,
:image_video_big_url
has_one :user
has_many :comments, :likes
def include_user?
object.association(:user).loaded?
end
def include_comments?
object.association(:comments).loaded?
end
def include_associations?
object.association(:user, :comments, :likes).loaded?
end
end
So, when making a request for this show action, the error that the Rails app launches is this:
Started GET "/media/7.json" for 127.0.0.1 at 2014-12-25 18:13:43 +0200
Processing by Content::MediaController#show as JSON
Parameters: {"id"=>"7"}
Medium Load (0.4ms) SELECT "media".* FROM "media" WHERE "media"."id" = $1 LIMIT 1 [["id", 7]]
Comment Load (0.5ms) SELECT "comments".* FROM "comments" WHERE "comments"."medium_id" = $1 [["medium_id", 7]]
Completed 500 Internal Server Error in 59ms
TypeError - can't clone Symbol:
activesupport (4.2.0) lib/active_support/core_ext/object/try.rb:77:in `try!'
activesupport (4.2.0) lib/active_support/core_ext/object/try.rb:63:in `try'
activerecord (4.2.0) lib/active_record/serialization.rb:12:in `serializable_hash'
activemodel (4.2.0) lib/active_model/serialization.rb:114:in `block (2 levels) in serializable_hash'
activemodel (4.2.0) lib/active_model/serialization.rb:114:in `block in serializable_hash'
activemodel (4.2.0) lib/active_model/serialization.rb:158:in `block in serializable_add_includes'
activemodel (4.2.0) lib/active_model/serialization.rb:156:in `serializable_add_includes'
activemodel (4.2.0) lib/active_model/serialization.rb:112:in `serializable_hash'
activerecord (4.2.0) lib/active_record/serialization.rb:17:in `serializable_hash'
activemodel (4.2.0) lib/active_model/serializers/json.rb:99:in `as_json'
app/models/medium.rb:32:in `as_json'
activesupport (4.2.0) lib/active_support/json/encoding.rb:34:in `encode'
activesupport (4.2.0) lib/active_support/json/encoding.rb:21:in `encode'
activesupport (4.2.0) lib/active_support/core_ext/object/json.rb:37:in `to_json_with_active_support_encoder'
actionpack (4.2.0) lib/action_controller/metal/renderers.rb:116:in `block in <module:Renderers>'
actionpack (4.2.0) lib/action_controller/metal/renderers.rb:45:in `block in _render_to_body_with_renderer'
/home/kaspar/.rbenv/versions/2.1.3/lib/ruby/2.1.0/set.rb:263:in `each'
actionpack (4.2.0) lib/action_controller/metal/renderers.rb:41:in `_render_to_body_with_renderer'
actionpack (4.2.0) lib/action_controller/metal/renderers.rb:37:in `render_to_body'
actionpack (4.2.0) lib/abstract_controller/rendering.rb:25:in `render'
actionpack (4.2.0) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (4.2.0) lib/action_controller/metal/instrumentation.rb:41:in `block (2 levels) in render'
activesupport (4.2.0) lib/active_support/core_ext/benchmark.rb:12:in `block in ms'
/home/kaspar/.rbenv/versions/2.1.3/lib/ruby/2.1.0/benchmark.rb:294:in `realtime'
activesupport (4.2.0) lib/active_support/core_ext/benchmark.rb:12:in `ms'
actionpack (4.2.0) lib/action_controller/metal/instrumentation.rb:41:in `block in render'
actionpack (4.2.0) lib/action_controller/metal/instrumentation.rb:84:in `cleanup_view_runtime'
activerecord (4.2.0) lib/active_record/railties/controller_runtime.rb:25:in `cleanup_view_runtime'
actionpack (4.2.0) lib/action_controller/metal/instrumentation.rb:40:in `render'
responders (2.0.2) lib/action_controller/responder.rb:258:in `display'
responders (2.0.2) lib/action_controller/responder.rb:212:in `api_behavior'
responders (2.0.2) lib/action_controller/responder.rb:191:in `rescue in to_format'
responders (2.0.2) lib/action_controller/responder.rb:185:in `to_format'
responders (2.0.2) lib/action_controller/responder.rb:163:in `respond'
responders (2.0.2) lib/action_controller/responder.rb:156:in `call'
responders (2.0.2) lib/action_controller/respond_with.rb:203:in `respond_with'
app/controllers/content/media_controller.rb:17:in `show'
actionpack (4.2.0) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
actionpack (4.2.0) lib/abstract_controller/base.rb:198:in `process_action'
actionpack (4.2.0) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (4.2.0) lib/abstract_controller/callbacks.rb:20:in `block in process_action'
activesupport (4.2.0) lib/active_support/callbacks.rb:117:in `call'
activesupport (4.2.0) lib/active_support/callbacks.rb:151:in `block in halting_and_conditional'
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `block in halting'
activesupport (4.2.0) lib/active_support/callbacks.rb:151:in `block in halting_and_conditional'
activesupport (4.2.0) lib/active_support/callbacks.rb:234:in `block in halting'
activesupport (4.2.0) lib/active_support/callbacks.rb:234:in `block in halting'
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `block in halting'
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `block in halting'
activesupport (4.2.0) lib/active_support/callbacks.rb:169:in `block in halting'
activesupport (4.2.0) lib/active_support/callbacks.rb:92:in `_run_callbacks'
activesupport (4.2.0) lib/active_support/callbacks.rb:734:in `_run_process_action_callbacks'
activesupport (4.2.0) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.0) lib/abstract_controller/callbacks.rb:19:in `process_action'
actionpack (4.2.0) lib/action_controller/metal/rescue.rb:29:in `process_action'
actionpack (4.2.0) lib/action_controller/metal/instrumentation.rb:31:in `block in process_action'
activesupport (4.2.0) lib/active_support/notifications.rb:164:in `block in instrument'
activesupport (4.2.0) lib/active_support/notifications/instrumenter.rb:20:in `instrument'
activesupport (4.2.0) lib/active_support/notifications.rb:164:in `instrument'
actionpack (4.2.0) lib/action_controller/metal/instrumentation.rb:30:in `process_action'
actionpack (4.2.0) lib/action_controller/metal/params_wrapper.rb:250:in `process_action'
activerecord (4.2.0) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (4.2.0) lib/abstract_controller/base.rb:137:in `process'
actionview (4.2.0) lib/action_view/rendering.rb:30:in `process'
actionpack (4.2.0) lib/action_controller/metal.rb:195:in `dispatch'
actionpack (4.2.0) lib/action_controller/metal/rack_delegation.rb:13:in `dispatch'
actionpack (4.2.0) lib/action_controller/metal.rb:236:in `block in action'
actionpack (4.2.0) lib/action_dispatch/routing/route_set.rb:73:in `dispatch'
actionpack (4.2.0) lib/action_dispatch/routing/route_set.rb:42:in `serve'
actionpack (4.2.0) lib/action_dispatch/journey/router.rb:43:in `block in serve'
actionpack (4.2.0) lib/action_dispatch/journey/router.rb:30:in `serve'
actionpack (4.2.0) lib/action_dispatch/routing/route_set.rb:802:in `call'
warden (1.2.3) lib/warden/manager.rb:35:in `block in call'
warden (1.2.3) lib/warden/manager.rb:34:in `call'
rack (1.6.0) lib/rack/etag.rb:24:in `call'
rack (1.6.0) lib/rack/conditionalget.rb:25:in `call'
rack (1.6.0) lib/rack/head.rb:13:in `call'
actionpack (4.2.0) lib/action_dispatch/middleware/params_parser.rb:27:in `call'
actionpack (4.2.0) lib/action_dispatch/middleware/flash.rb:260:in `call'
rack (1.6.0) lib/rack/session/abstract/id.rb:225:in `context'
rack (1.6.0) lib/rack/session/abstract/id.rb:220:in `call'
actionpack (4.2.0) lib/action_dispatch/middleware/cookies.rb:560:in `call'
activerecord (4.2.0) lib/active_record/query_cache.rb:36:in `call'
activerecord (4.2.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:647:in `call'
activerecord (4.2.0) lib/active_record/migration.rb:378:in `call'
actionpack (4.2.0) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (4.2.0) lib/active_support/callbacks.rb:88:in `_run_callbacks'
activesupport (4.2.0) lib/active_support/callbacks.rb:734:in `_run_call_callbacks'
activesupport (4.2.0) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (4.2.0) lib/action_dispatch/middleware/callbacks.rb:27:in `call'
actionpack (4.2.0) lib/action_dispatch/middleware/reloader.rb:73:in `call'
actionpack (4.2.0) lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
better_errors (2.1.0) lib/better_errors/middleware.rb:84:in `protected_app_call'
better_errors (2.1.0) lib/better_errors/middleware.rb:79:in `better_errors_call'
better_errors (2.1.0) lib/better_errors/middleware.rb:57:in `call'
actionpack (4.2.0) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
actionpack (4.2.0) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
railties (4.2.0) lib/rails/rack/logger.rb:38:in `call_app'
railties (4.2.0) lib/rails/rack/logger.rb:20:in `block in call'
activesupport (4.2.0) lib/active_support/tagged_logging.rb:68:in `block in tagged'
activesupport (4.2.0) lib/active_support/tagged_logging.rb:26:in `tagged'
activesupport (4.2.0) lib/active_support/tagged_logging.rb:68:in `tagged'
railties (4.2.0) lib/rails/rack/logger.rb:20:in `call'
quiet_assets (1.1.0) lib/quiet_assets.rb:27:in `call_with_quiet_assets'
actionpack (4.2.0) lib/action_dispatch/middleware/request_id.rb:21:in `call'
rack (1.6.0) lib/rack/methodoverride.rb:22:in `call'
rack (1.6.0) lib/rack/runtime.rb:18:in `call'
activesupport (4.2.0) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
rack (1.6.0) lib/rack/lock.rb:17:in `call'
actionpack (4.2.0) lib/action_dispatch/middleware/static.rb:113:in `call'
rack (1.6.0) lib/rack/sendfile.rb:113:in `call'
railties (4.2.0) lib/rails/engine.rb:518:in `call'
railties (4.2.0) lib/rails/application.rb:164:in `call'
passenger (4.0.56) lib/phusion_passenger/rack/thread_handler_extension.rb:74:in `process_request'
passenger (4.0.56) lib/phusion_passenger/request_handler/thread_handler.rb:141:in `accept_and_process_next_request'
passenger (4.0.56) lib/phusion_passenger/request_handler/thread_handler.rb:109:in `main_loop'
passenger (4.0.56) lib/phusion_passenger/request_handler.rb:455:in `block (3 levels) in start_threads'
It's worth noting that if I remove both from: user includes the new method include:
, then everything works. But I want every comment to also include the user who created it and the environments to include the user who uploaded it.
What could be the problem? Let me know if more information is needed.
EDIT: The problem seems to be related only to :user
for comments:
.
Posting comments on the serializer here:
class CommentSerializer < ActiveModel::Serializer
attributes :id,
:text,
:user_id,
:medium_id
has_one :user
end
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1 answer
I faced the same error using the built-in ActiveModel serializer for JSON. You can overwrite the method as_json
with similar syntax for your call respond_with
. Using your models, I had
include: [{comments: :user} ... ]
when i needed
include: [{comments: {include: [:user]}}, ... ]
See if the following change fixes your problem (if you still have).
Edit
respond_with medium, include: [{comments: :user}, :likes, :user]
to
respond_with medium, include: [{comments: {include: [:user]}}, :likes, :user]
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