mongoid - NoMethodError - undefined method `empty?' for #<ActionDispatch::Http::UploadedFile:0x007f985c1f4298> -

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i have user model, have defined

include mongoid::paperclip   has_mongoid_attached_file :profile_pic

in users controller apis have defined upload method

def upload_profile_pic     @user = user.where(uuid: params[:id]).first     if @user.update_attributes(params[:profile_pic])       upload_status = {status: 'successfully uploaded'}     else       upload_status = {status: 'error'}     end     respond_with upload_status   end

when tried calling method using route, give me error

i calling method using post method, using rest-client using ruby script

require 'rest_client'   jsondata = {     profile_pic: file.new('test.png'),     version: '1'  }   response = restclient.post("http://localhost:3000/api/v2/users/my_user_id/upload_profile_pic", jsondata)  puts response  nomethoderror - undefined method `empty?' #<actiondispatch::http::uploadedfile:0x007f985c1f4298>

i have installed imagemagick in machine using apt-get

i using rails 4.2.0, mongoid

full error trace.

nomethoderror - undefined method `empty?' #<actiondispatch::http::uploadedfile:0x007f985c1f4298>:    () home/joel/.rvm/gems/ruby-2.2.0@project/bundler/gems/mongoid-45dbee4f77db/lib/mongoid/attributes/processing.rb:21:in `process_attributes'    () home/joel/.rvm/gems/ruby-2.2.0@project/bundler/gems/mongoid-45dbee4f77db/lib/mongoid/attributes.rb:205:in `block in assign_attributes'    () home/joel/.rvm/gems/ruby-2.2.0@project/bundler/gems/mongoid-45dbee4f77db/lib/mongoid/threaded/lifecycle.rb:26:in `_assigning'    () home/joel/.rvm/gems/ruby-2.2.0@project/bundler/gems/mongoid-45dbee4f77db/lib/mongoid/attributes.rb:204:in `assign_attributes'    () home/joel/.rvm/gems/ruby-2.2.0@project/bundler/gems/mongoid-45dbee4f77db/lib/mongoid/persistable/updatable.rb:51:in `update'   app/controllers/api/v2/users_controller.rb:15:in `upload_profile_pic'   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:151:in `block in halting_and_conditional'   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:234: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'   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'   mobme-infrastructure-splunk-logger (2.0.0) lib/mobme/infrastructure/splunk_logger/middleware.rb:17:in `call'   rack (1.6.0) lib/rack/etag.rb:24:in `call'   rack (1.6.0) lib/rack/conditionalget.rb:38: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'   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 (2.1.1) lib/better_errors/middleware.rb:84:in `protected_app_call'   better_errors (2.1.1) lib/better_errors/middleware.rb:79:in `better_errors_call'   better_errors (2.1.1) 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'   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'   rack (1.6.0) lib/rack/lock.rb:17:in `call'   rack (1.6.0) lib/rack/content_length.rb:15:in `call'   rack (1.6.0) lib/rack/handler/webrick.rb:89:in `service'   /home/joel/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/httpserver.rb:138:in `service'   /home/joel/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/httpserver.rb:94:in `run'   /home/joel/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/webrick/server.rb:294:in `block in start_thread'


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