[Ruby on Rails] Since I finished all Rails Tutorial, I tried to implement an additional "stock function"


I implemented a function to stock articles like "qiita" in Rails, so I will summarize the method as a memorandum. (Basically the same way as the like function)

To implement

-Create a button to stock articles. -Display how much articles are in stock. -Allow stocked posts to be checked on the stock list page.

Create a Stock model

The first step in implementing the stock feature is to create a Stock model.

$ rails g model Stock

Create two columns. -Post_id column -User_id column Modify the migration file as follows.


class CreateStocks < ActiveRecord::Migration[6.0]
  def change
    create_table :stocks do |t|
      t.references :user, foreign_key: true
      t.references :post, foreign_key: true

    add_index :stocks, [:user_id, :post_id], unique: true
$ rails db:migrate

Add each of the two columns as a foreign key. This table will be used as an intermediate table to store information such as ** who stocked which post **. Also, set the index so that the combination of the user_id column and the post_id column is unique.

Set up an association

Set up the association as follows: Add validation to stock.rb in addition to the association.



has_many :stocks, dependent: :destroy



has_many :stocks, dependent: :destroy



belongs_to :user
belongs_to :post

validates :user_id, presence: true
validates :post_id, presence: true

Create a stock controller

Then create a stock controller.

$ rails g controller Stocks

Add processing to the controller

stocks_controller.rb After creating the stock controller, define the actions required for this implementation.


class StocksController < ApplicationController

  def create
    @stock = current_user.stocks.create(post_id: params[:post_id])
    redirect_back(fallback_location: root_path)
  def destroy
    @stock = Stock.find_by(
      post_id: params[:post_id],
      user_id: current_user.id
    redirect_back(fallback_location: root_path)

  def index
    @stocks = Stock.where(user_id: current_user.id)

posts_controller.rb Then add a variable to the ** show action ** part of the post controller. This is to display the stock button on the post/show page.


  def show
    @post = Post.find_by(id: params[:id])
    @stock = Stock.find_by(
      user_id: current_user.id,
      post_id: @post.id

Set up routing

Next, we will add the necessary routing. routes.rb


resources :stocks, only:[:create, :destroy, :index]

This time, in addition to the stocking function ** (create) ** and the stocking release function ** (destroy) **, ** "index" ** for displaying stocked articles is also added.

Add to the process of confirming whether it is in stock

Define a stock? Method so that the user can check if the article is already in stock. user.rb


  #Check if the user is already in stock
  def stock?(post)
    self.stocks.exists?(post_id: post.id)

Add & change View

In order to implement the stock button, we will first create three partials. shared/_stock.html.erb


<%= form_with(url:stocks_path, local: true) do |f| %>
  <div><%= hidden_field_tag :post_id, @post.id %></div>
 <%= f.submit "stock", class:"btn-sm" %>
<% end %>



<%= form_with(url: stock_path(@stock), html: {method: :delete}, local: true) do |f| %>
  <div><%= hidden_field_tag :post_id, @post.id %></div>
  <%= f.submit "Stop stocking", class:"btn-sm" %>
<% end %>



<% if current_user.stock?(@post) %>
  <%= render "shared/unstock" %>
<% else %>
  <%= render "shared/stock" %>
<% end %>
<%= @post.stocks.count %>

posts/show Add the following partial where you want to add the button.


<%= render "shared/stock_form" %>

stocks/index.html.erb Add a new indek page to display stocked articles.


<h1>Stock list</h1>
<h2>A list of portfolios you have stocked.</h2>

<% @stocks.each do |stock| %>
  <%= link_to stock.post.name, post_path(stock.post) %>
<% end %>

Completed picture


That is all. I don't care about the design at all because it describes how to implement the function. Please add the design as you like.

Click here for source code

I'm working on a portfolio. It is below. https://github.com/iittaa/Sharing_Portfolio

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