Ruby on Rails5 Quick Learning Practice Guide chapter2

2-6-1-1 Create a new Rails application

$ rails new scaffold_app -d postgresql

rails new: Create a new Rails file scaffold_app: file name -d postgresql: SQL specification (-d means postgreSQL)

2-6-1-2 Create a template for user management functions

$ bin/rails generate scaffold user name:string address:string age:integer

bin/rails： scaffold: A tool that makes it easy to put together the work of creating an app user: model name (user model) name: string address: string age: integer: Create a table by putting 3 pieces of information into the table.

Column YAML basics

YAML is a format for representing structured data.

animal: &animal
 cat: 'cat'
 dog: 'Dog'

animal_shop_1:
  <<: *animal
  hamster: 'hamster'

animal_shop_2:
  <<: *animal
  parrot: 'Parrot'

Keep animal as & animal So & animal = cat:'cat' dog:'dog'

animal_shop_1 is <<: *animal hamster:'hamster'

In other words & Animal and hamster:'hamster' cat:'cat' dog:'dog' hamster: become'hamster'

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