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

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.