如何在Rails控制器的表单参数中添加user_id

Question

I have this model, called products , that has an id , user_id and product_name . I have a simple form_for to pass to my product_controller the product_name param. In this same controller, I have access to the current_user , which I have to pass in order to create a new Product . The problem is that the user_id always has to be the current user logged in, so I can't allow the user to send me this param in my form_for , thus I can't permit it as well. What I'm doing right now is to create a new hash with the user_id param, and merge the params that comes from the form .

products_controller.rb:

  def create
    product_user_id_param = { "user_id": current_user.id.to_s }
    @product = Product.new(product_user_id_param.merge(params[:product_name]))
    ...
  end

Is there a more convenient or Rails way to do this?

Answer 1

Solution #1

Product has user_id which means product belongs_to :user and user has_many :products

Hence it can be written as

current_user.products.new(product_name: params[:product_name])

Solution#2

Set current_user explicitly

@product = Product.new(product_name: params[:product_name])
@product.user_id = current_user.id
#@product.user = current_user
@product.save

Answer 2

You can create you product with you current_user reference, this is the more convenient way in my opinion:

current_user.produtcs.create(name: params[:product_name])

But, to above code works, you have to construct you relations correctly, like the following:

class User < ActiveRecord::Base
   has_many :products
end

class Product < ActiveRecord::Base
   belogs_to :user
end

Now, you can do it!

You can read more about it, in https://guides.rubyonrails.org/v3.2/association_basics.html , the docs recommeds this way!