Create a large number of records with one command using the Ruby on Rails seeds.rb file

What is seeds.rb?

A file in the app / db directory used to create records.

You don't have to manually register the data one by one when creating a record. Seeds.rb allows you to create a large number of records with a single command.

How to create a record using seeds.rb

  1. Describe the record creation process in the seeds.rb file
  2. Run rails db: seed
  3. Processing of seeds.rb file is executed

Example: Register names and email addresses for 100 people in the users table

Describe as follows in app / db / seeds.rb,

seeds.rb


100.times do |n|
  User.create(name: "name#{n}", email: "mail#{n}@gmail.com")
end

When you run ** rails db: seed **, The users table has name and email values respectively

"name0, [email protected]", "name1, [email protected]", ・ ・ ・ "name99, [email protected]"

100 records are registered as shown in.

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