Question

我是铁杆上的红宝石，所以请原谅这个问题。我尝试按照这个例子Rails sort tags by most used (tag.posts.count)但是仍然收到一个错误“项目：模块的未定义方法`顺序”。我正在尝试根据项目的喜好对项目列表进行排序。所以一个有5个喜欢的项目应放在一个只有3个喜欢的项目上方。我在下面列出了我的所有相关代码。非常感谢你们！

Like.rb

class Like < ApplicationRecord
belongs_to :item, :counter_cache => true
belongs_to :user
end

Likes_controller.rb

class Items::LikesController < ApplicationController
before_action :authenticate_user!
before_action :set_book

def create      
    @item.likes.where(user_id: current_user.id).first_or_create             
    respond_to do |format|
        format.html {redirect_to @item}
        format.js
    end
end 
def destroy
    @item.likes.where(user_id: current_user.id).destroy_all

    respond_to do |format|
        format.html {redirect_to @item}
        format.js
    end
end
private 
def set_book
    @item = Item.find(params[:item_id])
end
end

item.rb的

class Item < ApplicationRecord
has_many :likes, :counter_cache => true

users_controller.rb

class UsersController < ApplicationController
before_action :authenticate_user!
before_action :set_user, only: [:show, :edit, :update, :destroy]

def index
@items = Item.all   
Items.order('likes_count')
end

def show
@items = Item.find(params[:id])
end


private

def set_user
    @item = Item.find(params[:id])
end
end

index.html.erb

   <% @items.each do |item| %>
<%=  item.product %>
<div><%= image_tag(item.avatar.url(:thumb)) %></div>
<% end %>

迁移相关

class AddLikecountsToItem < ActiveRecord::Migration[5.0]
def change
add_column :items, :likes_count, :integer, :null => false, :default => 0
 end
end

class CreateLikes < ActiveRecord::Migration[5.0]
def change
create_table :likes do |t|
  t.integer :user_id
  t.integer :item_id

  t.timestamps
end

端端

Answer 1

在users_controller.rb

中

def index
  @items = Item.order('likes_count')
end

根据用户完成的喜欢对Rails中的项目列表进行排序

1 个答案: