如何在rails中设置一个like按钮

Question

您好，我有一个锻炼应用程序，用户应该可以在其中喜欢某些产品。 我可以找到一种方法来展示他喜欢的产品，但我真的不知道如何创建 like 按钮。 我没有使用任何 gem，我不知道如何从头开始。

这是我的模型：

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

在我的视图产品中显示我想要喜欢按钮的位置：

<h1><%= @product.name %></h1>

<%= link_to "Like", product_likes_path(@product), method: :put, remote: true %>

我的路线：

Rails.application.routes.draw do
  root to: 'visitors#index'
  devise_for :users
  resources :users

  resources :products do
    resource :likes
  end
end

那是我的产品控制器，我认为这里必须有东西，但我不知道如何！

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

我创建了一个点赞控制器，但它似乎没有用......所以......我放弃了......

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

我真的很想了解一下这个问题:)

Answer 1

终于知道怎么设置控制器了

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

按钮

<%= link_to "Like", product_likes_path(@product), method: :post %>

路线

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

您可以尝试以下方法：

路线：

  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

这会给你类似的东西：

  ... 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 ...

然后：

  <%= link_to "Like", user_product_likes_path(@user, @product), method: :post, remote: true %>

在你的 LikesController 中：

  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

未经测试，所以买家要小心。你可能需要摆弄你的 like_params 和其他东西。