[RUBY] [Rails] Creating a new project with rails new


Since I'm supposed to forget how to add options and specify the version every time, I will also summarize the rails new surroundings as a memorandum.

Create a new project

① Check the version of installed rails

$ gem search ^rails$ -l

*** LOCAL GEMS ***

rails (,,, 6.0.0)

You can use the version shown here to create a Rails application.

② Create a new project

$rails new Project name to create

You can launch a new project by entering the rails new command.

③ Move to the created project

$cd project name

Change to the directory of the project you created using the cd command.

④ Start the local server

rails server
rails s

You can set up a local server.

=> Booting Puma
=> Rails application starting in development 
=> Run `rails server --help` for more startup options
Puma starting in single mode...
* Version 3.12.6 (ruby 2.6.5-p114), codename: Llamas in Pajamas
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://localhost:3000
Use Ctrl-C to stop

Is displayed, the startup is successful.

⑤ Display the default page

In your browser http: // localhost: 3000 / To access If the You ’re on Rails !! screen appears, it's OK!

Delete project

① Delete database

$ rails db:drop

If you are creating a database, you must first delete it with this command.

② Delete the directory

rm -r directory name

You can delete it with this command. You can erase it with the viewfinder.

Frequently used options

Database specification

(When Mysql is specified)
Rails new project name-d mysql
Rails new project name — database=mysql

The default database is SQLite3. If you want to change to Mysql or potgresql, it is easy to specify it first.

Specifying the version

Rails _6.0.0_new project name

By default, the latest installed version of rails will be launched. If you need to specify the version, specify it first.

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