How to set a like button in rails - ruby-on-rails

Question

Hello I have an exercise app where a user should be able to Like some products.
I could find a way to display the product he liked, but I really can't figure how to create and make work the like button.
I am not using any gem, I wan't to understand how to do it from Scratch.
Here are my models:
class User < ApplicationRecord
has_many :likes
has_many :liked_products, through: :likes, source: :product
end
class Product < ApplicationRecord
has_many :likes
end
class Like < ApplicationRecord
belongs_to :user
belongs_to :product
end
In my view product show where I want the like button:
<h1><%= #product.name %></h1>
<%= link_to "Like", product_likes_path(#product), method: :put, remote: true %>
my routes:
Rails.application.routes.draw do
root to: 'visitors#index'
devise_for :users
resources :users
resources :products do
resource :likes
end
end
That's my products controller, I think things must come in here but I don't know HOW!
class ProductsController < ApplicationController
before_action :find_product, only: :show
def index
#products = Product.all
end
def show
##product.like => gives an error 404
end
private
def find_product
#product = Product.find(params[:id])
end
end
I had created a likes controller but it seems it is not useful.... So... I gave up there...
class LikesController < ApplicationController
def new
#like = Like.new(like_params)
end
def create
#like = Like.new(like_params)
end
private
def like_params
params.require(:likes).permit(:user_id, :product_id)
end
end
I would really enjoy some light on this please :)

Answer 1

Finally found out how to set the controller
class LikesController < ApplicationController
def create
#user = current_user.id
#product = params[:product_id]
likes = {user_id: #user, product_id: #product}
#like = Like.new(likes)
#like.save!
if #like.save
redirect_to user_path(#user)
else
redirect_to product_path
end
end
end
the buttton
<%= link_to "Like", product_likes_path(#product), method: :post %>
routes
Rails.application.routes.draw do
root to: 'products#index'
devise_for :users
resources :users
resources :users do
resources :products do
resources :likes
end
end
end

Answer 2

You could try something along these lines:
Routes:
Rails.application.routes.draw do
root to: 'visitors#index'
devise_for :users
resources :users do
resources :products do
resources :likes
end
end
resources :products do
resource :likes
end
end
Which will give you something like:
... other routes ...
user_product_likes GET /users/:user_id/products/:product_id/likes(.:format) likes#index
POST /users/:user_id/products/:product_id/likes(.:format) likes#create
new_user_product_like GET /users/:user_id/products/:product_id/likes/new(.:format) likes#new
edit_user_product_like GET /users/:user_id/products/:product_id/likes/:id/edit(.:format) likes#edit
user_product_like GET /users/:user_id/products/:product_id/likes/:id(.:format) likes#show
PATCH /users/:user_id/products/:product_id/likes/:id(.:format) likes#update
PUT /users/:user_id/products/:product_id/likes/:id(.:format) likes#update
DELETE /users/:user_id/products/:product_id/likes/:id(.:format) likes#destroy
... other routes ...
Then:
<%= link_to "Like", user_product_likes_path(#user, #product), method: :post, remote: true %>
And in your LikesController:
class LikesController < ApplicationController
def new
#like = Like.new(like_params)
end
def create
#like = Like.new(like_params)
if #like.save
... do something happy
else
... do something sad
end
end
private
def like_params
params.require(:likes).permit(:user_id, :product_id)
end
end
Untested, so buyer beware. You might need to fiddle with your like_params and other stuff.