Meal ordering system and associations - ruby-on-rails

Question

I'm doing meal ordering system in Rails, I made model for User, Restaurant, Meal and Order and I don't know which associations should I use to connect all these models together. For now my models looks like this:
class User < ApplicationRecord
has_many :orders
has_many :restaurants, through: :orders
end
class Order < ApplicationRecord
belongs_to :user
belongs_to :restaurant
end
class Meal < ApplicationRecord
belongs_to :restaurant
end
class Restaurant < ApplicationRecord
has_many :orders
has_many :meals
has_many :users, through: :orders
end
Now when I'm using form to order some meal and save this order in the database I'm getting error in log:
Parameters: {"utf8"=>"✓", "authenticity_token"=>"+pwoJ/82k/2SiS7z4X4nVHyaKCMMfWCECQe6TufnkpNaW9PEgvlwxlf3skAH2QQupSLIoe81Z/I0CleL/m9cjw==", "orders"=>{"restaurant_id"=>"2", "meal_id"=>"2", "suggestions"=>""}, "commit"=>"Place your order"}
Unpermitted parameters: restaurant_id, meal_id
(0.1ms) begin transaction
(0.1ms) rollback transaction
Redirected to http://localhost:3000/
Completed 302 Found in 8ms (ActiveRecord: 0.2ms)
My order controller looks like this:
class OrdersController < ApplicationController
def new
#order = Order.new
end
def create
#order = Order.new(order_params)
if #order.save
redirect_to root_path
flash[:success] = "Your order has been added"
else
flash[:danger] = "Error"
redirect_to root_path
end
end
private
def order_params
params.require(:orders).permit(:restaurant, :meal, :suggestions)
end
end
When I change def order_params to:
params.require(:orders).permit(:restaurant_id, :meal_id, :suggestions)
I'm getting
unknown attribute 'restaurant_id' for Order.
I assume that it's bad associations fault, can anyone help me?
* UPDATE *
Now I'm getting error in my log when I'm trying to save order:
Started POST "/new_order" for 127.0.0.1 at 2016-12-19 11:18:50 +0100
Processing by OrdersController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"nnDqY0FVzUslTJ1VoL57vnlO6aSTLcVuenT1GJwloJ8+txGAPJoucOAyAeZGGVjEoPYJJnBlwhhHeRjdha1ugw==", "orders"=>{"restaurant_id"=>"4", "meal_id"=>"26", "suggestions"=>""}, "commit"=>"Place your order"}
(0.1ms) begin transaction
Restaurant Load (0.1ms) SELECT "restaurants".* FROM "restaurants" WHERE "restaurants"."id" = ? LIMIT ? [["id", 4], ["LIMIT", 1]]
(0.1ms) rollback transaction
Redirected to http://localhost:3000/
Completed 302 Found in 6ms (ActiveRecord: 0.3ms)
* Update 2 *
When I change for #order.save! I get:
Validation failed: User must exist
With order.errors.inspect I just get:
(0.2ms) rollback transaction
No template found for OrdersController#create, rendering head :no_content
Completed 204 No Content in 97ms (ActiveRecord: 1.8ms)
I'm using omniauth to sign in before user can order a meal and this is only way to sign up or sign in. When I created Order model I used user:references, you think this can be a reason?

Answer 1

You said that you have a sign_in/sign_up, so I assume that you have a current_user in your controller.
In order to save your order you need to supply user_id, here is a one way to do it
def order_params
params.require(:orders).permit(:restaurant, :meal, :suggestions)
.merge(user_id: current_user.id)
end