[RUBY] Utilization of seed file

What is a seed file?

What defines the data that you want to put in the database in advance By defining the data in advance, you can easily put the data in the database with a command.

Defined in seed file

db/seeds.rb

Category.create(name:'mens')
Category.create(name:'Women')
Category.create(name:'Kids')

Command execution

% rails db:seed

Success if the database contains data

• In the above case, you have to create the name column after creating the category model.