Ruby on rails learning record -2020.10.03

Ruby on rails basic commands

Check rails version

Create a rails project

Start the server for Rails

Start rails Access "http: // localhost: 3000 or localhost: 3000".

Creating a bulletin board Automatically generate a bulletin board ``` $ rails generate scaffold article content:string $ rails db:migrate ```

Access the bulletin board to be created "Articles" describes the app name specified by the rails scaffold command in plural form. Go to "localhost: 3000 / articles". To do.

When representing multiple collections (collections of DB rows, etc.), they are plural, and when there is only one (class (model controller), etc.), they are singular.

Creating a Welcome page $ rails generate controller welcome [page name] index

Visit the Welcome page. 「localhost:3000/welcome/index」

Set on the top page.


Rails.application.routes.draw do
  get 'welcome/index'

  resources :articles
  root 'welcome#index'
  # For details on the DSL available within this file, see

How to modify a web page


<h1>Hello BBS</h1>
<p><%= %></p>
<%= link_to 'Show list', articles_path %>

-MVC architecture -Model: Holds and operates the data handled by the application. -View: Display the received data. -Controller: Handles requests from users, calls model views and returns results.

How to add columns Add name column to database articles table


$ rails db:migtare

Modify the view file


      <th colspan="3"></th>
    <% @articles.each do |article| %>
        <td><%= article.content %></td>
        <td><%= %></td>
        <td><%= link_to 'Show', article %></td>
        <td><%= link_to 'Edit', edit_article_path(article) %></td>
        <td><%= link_to 'Destroy', article, method: :delete, data: { confirm: 'Are you sure?' } %></td>
    <% end %>


  <%= %>


<div class="field">
  <%= f.label :name %>
  <%= f.text_field :name %>

Fix controller


def article_params
    params.require(:article).permit(:content, :name)

Reference Get started with Rails | Rails Guide

Ruby on Rails Tutorial: Learn Rails with Examples

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