ruby-on-rails,arrays , How to pass array in rails 4 strong parameters


How to pass array in rails 4 strong parameters

Question:

Tag: ruby-on-rails,arrays

I have to pass a array of food_item_ids in my order_controller. Every order will have many food_items. How can I pass these food_items_id as an array in strong parameters.

orders_controller.rb

def create  
        @order = Order.new(order_params)
        if @order.save
            render :json, @order, status:201, location: [:api, @order]
        else
            render :json, { errors: @order.errors }, status:422
        end
    end

private
  def order_params

    params.require(:order).permit(:customer_id, :order_id, :pos_id, :table_id, :order_number, 
          :order_status,:order_date, :food_item_id => [])
  end
end

Is this the right way to send an array in strong params :food_item_id => []


Answer:

According to the docs https://github.com/rails/strong_parameters#permitted-scalar-values:

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 => [])

If it is not working, you might have a misspelling... you have asked how to pass food_items_id, but you are permitting the :food_item_id => []. So, double check the params you are receiving in the controller, you might have to change:

:food_items_id => []

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