'Why am I getting "Unpermitted parameter: format"?

I'm getting these parameters in my Rails controller:

Parameters: {"id"=>"238", "user_id"=>1, "group_id"=>43, "title"=>"asdasdasd 1111 ultadas ult asdas", "description"=>"asdssss", "state_id"=>nil, "allow_anonymous_answer"=>false, "initial_message"=>"asdasdsadas", "final_message"=>"dasdasdsad", "poll_pages"=>[{"id"=>382, "poll_id"=>238, "title"=>"Pagina 1", "description"=>"Pagina 1", "position"=>1, "created_at"=>"2016-05-06T14:25:56.795Z", "updated_at"=>"2016-05-06T14:25:56.795Z"}], "poll"=>{"id"=>"238", "user_id"=>1, "group_id"=>43, "title"=>"asdasdasd 1111 ultadas ult asdas", "description"=>"asdssss", "state_id"=>nil, "allow_anonymous_answer"=>false, "initial_message"=>"asdasdsadas", "final_message"=>"dasdasdsad"}}

Yet I get this message: Unpermitted parameter: format

Even though I'm using:

params.permit(:id, :user_id, :title, :description, :state_id, :group_id, :allow_anonymous_answer, :initial_message, :final_message, poll: [:id, :user_id, :title, :description, :state_id, :group_id, :allow_anonymous_answer, :initial_message, :final_message], poll_pages: [:id, :poll_id, :title, :description, :position, :created_at, :updated_at])
ruby-on-railsruby-on-rails-4parameters


Solution 1:[1]

you need to send correct format like:

params.require(:MODEL).permit(:id, :user_id, :title, :description, :state_id, :group_id, :allow_anonymous_answer, :initial_message, :final_message, poll_attributes: [:id, :user_id, :title, :description, :state_id, :group_id, :allow_anonymous_answer, :initial_message, :final_message], poll_pages_attributes: [:id, :poll_id, :title, :description, :position, :created_at, :updated_at])

And also _attributes for the nested attributes in your permit params : 

poll_attributes: [:id, :user_id, :title, :description, :state_id, :group_id, :allow_anonymous_answer, :initial_message, :final_message]

Solution 2:[2]

You need permitte in strong params the "format", it is in form, but can`t save any value until permitte this.

Solution 3:[3]

This is because when your request is for a specific format, for instance, json (ie: /some_controller/some_method.json), Rails sends a format param:

 #<ActionDispatch::Request:0x000000011b5e3898>, params: {"controller"=>"some_controller", "action"=>"some_method", "format"=>"json"} }

There is a global setting that can be set to always permit format params. In Rails 7 looks like:

config.action_controller.always_permitted_parameters = %w( controller action format )

According to the comments in Rails 6, it's like:

config.always_permitted_parameters = %w( controller action format )

Solution 4:[4]

I know this question is old, but I was having a similar problem and found a solution. In addition to what Sunny mentioned, I had to use the "inverse_of" helper method within my two models.

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Kaushlendra Tomar
Solution 2 Elton Santos
Solution 3 yorch
Solution 4 Clifton Regis

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