strong parameters not accepting array

Question

I have this in my view which is a multiselect checkbox

Model

class User < ActiveRecord::Base
  has_many :user_roles, :dependent =         


        

Answer 1

See the Rails Strong Parameters documentation regarding nested attributes.

The correct format is:

params.permit(:name, {:roles => []}, ...)

AnkitG's solution worked for me in Rails 4 using the Role Model gem for my user model. My user controller's implementation of _params ended up looking like:

def user_params
  # Bug with permit for nested arrays... @see https://stackoverflow.com/a/17880288/2631472
  params.require(:user).permit(:first_name, :last_name, :middle_name).tap do |whitelisted|
    whitelisted[:roles] = params[:user][:roles]
  end
end

Answer 2

This should work

params.require(:user).permit(:first_name, :role_ids => [])

Answer 3

Answering myself, I got it working not directly, but the below method from the Strong Parameters issues discussion helped me in converting a normal parameter to a whitelisted one.

def user_params
  params.require(:user).permit(:first_name).tap do |whitelisted|
    whitelisted[:role_ids] = params[:user][:role_ids]
  end
end