Rails 4 Unpermitted Parameters for Array

Question

I have an array field in my model and I\'m attempting to update it.

My strong parameter method is below

def post_params
  params[\"post\"][\"categor         


        

Answer 1

Try this

params.require(:post).permit(:name, :email, :categories => [])

(Disregard my comment, I don't think that matters)

Answer 2

I had the same problem but in my case I had also to change from:

<input type="checkbox" name="photographer[attending]" value="Baku">

to:

<input type="checkbox" name="photographer[attending][]" value="Baku">

Hope this is helping someone.

Answer 3

I had the same problem, but simply adding array to permit was not enough. I had to add type, too. This way:

params.require(:transaction).permit(:name, :tag_ids => [:id])

I am not sure if this is perfect solution, but after that, the 'Unpermitted parameters' log disappeared.

I found hint for that solution from this excellent post: http://patshaughnessy.net/2014/6/16/a-rule-of-thumb-for-strong-parameters

Answer 4

in rails 4, that would be,

params.require(:post).permit(:name, :email, {:categories => []})

Answer 5

The permitted scalar types are String, Symbol, NilClass, Numeric, TrueClass, FalseClass, Date, Time, DateTime, StringIO, IO, ActionDispatch::Http::UploadedFile and Rack::Test::UploadedFile.

To declare that the value in params must be an array of permitted scalar values map the key to an empty array:

params.permit(:id => [])

This is what the strong parameters documentation on Github says:

params.require(:post).permit(:name, :email, :categories => [])

I hope this works out for you.