Roughly the flow of web application development with Rails.

Perfect for myself.

Version change of ruby with rvm

terminal.

$ rvm install 2.5.1
$ rvm use 2.5.1

Create an app with Rails by specifying the version

terminal.

$ gem install rails -v 5.2.1 -N #6 for 6 series.0.2.1 or whatever.
$ rails _5.2.1_ new < app name >

Install the required gems

Gemfile.

gem 'bootstrap', '~> 4.1.1'
gem 'jquery-rails', '~> 4.3.1'

gem 'bycript' #Since it is prepared from the beginning, uncomment it

Other useful gems

・ Pagination gem'kaminari' 「kaminari x Rails6」

-User authentication implementation gem'device' "How to use device"

Other summary articles etc. ・ 15 Ruby on Rails Gem that you will definitely want to use for beginners ・ Qiita article "Convenient Gem you should know if you do Rails"

Finally

terminal.

$ bundle install 

Set up a server and check with a browser

terminal.

$ rails s -p Arbitrary port number#-It is ok even if there is no less than p. If not specified, it will be 3000

Access localhost: 3000 (or the specified port number) with a browser, and if the following page is displayed, it is ok

Modeling

For login system and user authentication function

terminal.

$ rails generate model User name:string email:string password_digest:string

For content such as blogs

terminal.

$ rails generate model Articles title:string description:text 

I want to add it later (for example, adding user_id to the Articles model)

Add the following to the created migrate file

class AddUserIdToArticles < ActiveRecord::Migration[5.1]
  def change
    add_column :articles, :user_id, :int
  end
end

Finally

terminal.

$ rails db:migrate

Controller and view creation

terminal.

$rails g controller Users index(If you make a user list) new edit

$rails g controller Home index

$rails g controller Sessions new #For login

Push to Github

$ git init #Create a local repository
$ git add .
$ git commit -m "first commit"
$git remote add origin URL of the repository created on Github
$ git push origin master

Branch commands

~ Create a new branch ~
$git branch Any branch name

~ Check for existing branches ~
$ git branch

~ Move to the branch you want to write ~
$git checkout The name of the branch you want to move

~ Push to the branch destination ~
$ git add .
$ git commit -m "first commit"
$git push origin The name of the branch you want to write

Merge commands

== Select the import destination branch ==
$ git checkout master

== Combine the branches you want to integrate into mater ==
$git merge The name of the branch you want to merge

== Send join information to GitHub ==
$ git push origin master

Ruby code summary that tends to be written in the view

hoge.html.erb

#link_to
<%= link_to 'top page', root_path %>
<%= link_to “Move to Yahoo”, “http://www.yahoo.co.jp/” %>
<%= link_to “Delete”, member_path(params[:id]), method: :delete %>