#はじめに
Userモデルで書いてみます。
#書き方
###timesを使って書いてみる。
seeds.rb
if Rails.env == "development"
10.times do |i|
User.create!(email: "test#{i + 1}@example.com", password: "password", password_confirmation: "password")
end
end
作成したユーザー↓
[1] pry(main)> User.all
User Load (1.2ms) SELECT "users".* FROM "users"
=> [#<User id: 1, email: "test1@example.com", created_at: "2019-07-11 02:13:55", updated_at: "2019-07-11 02:13:55">,
#<User id: 2, email: "test2@example.com", created_at: "2019-07-11 02:13:55", updated_at: "2019-07-11 02:13:55">,
#<User id: 3, email: "test3@example.com", created_at: "2019-07-11 02:13:56", updated_at: "2019-07-11 02:13:56">,
#<User id: 4, email: "test4@example.com", created_at: "2019-07-11 02:13:56", updated_at: "2019-07-11 02:13:56">,
#<User id: 5, email: "test5@example.com", created_at: "2019-07-11 02:13:56", updated_at: "2019-07-11 02:13:56">,
#<User id: 6, email: "test6@example.com", created_at: "2019-07-11 02:13:56", updated_at: "2019-07-11 02:13:56">,
#<User id: 7, email: "test7@example.com", created_at: "2019-07-11 02:13:56", updated_at: "2019-07-11 02:13:56">,
#<User id: 8, email: "test8@example.com", created_at: "2019-07-11 02:13:56", updated_at: "2019-07-11 02:13:56">,
#<User id: 9, email: "test9@example.com", created_at: "2019-07-11 02:13:56", updated_at: "2019-07-11 02:13:56">,
#<User id: 10, email: "test10@example.com", created_at: "2019-07-11 02:13:56", updated_at: "2019-07-11 02:13:56">]
###範囲オブジェクトを使って書いて見る
上と同じ結果になります。
seeds.rb
if Rails.env == "development"
(1..10).each do |i|
User.create!(email: "test#{i}@example.com", password: "password", password_confirmation: "password")
end
end
#create と create!
create!を使ったほうがいいと思います。
createだとvalidationに失敗したときに例外が発生しないため、思わぬ不具合が起きました。
今回、emailのバリデーションに一意性を追加しているのですが、createではエラーが出ず、ユーザーも最初の１人しか作成されませんでした。
###createでrails db:seedを実行する
seeds.rb
if Rails.env == "development"
(1..10).each do |i|
User.create(email: "test@example.com", password: "password", password_confirmation: "password")
end
end
$ rails db:seed
$
作成したユーザー↓
[1] pry(main)> User.all
User Load (2.9ms) SELECT "users".* FROM "users"
=> [#<User id: 1, email: "test@example.com", created_at: "2019-07-11 02:33:34", updated_at: "2019-07-11 02:33:34">]
###create!でrails db:seedを実行
create!であればちゃんとエラーが出ました。
seeds.rb
if Rails.env == "development"
(1..10).each do |i|
User.create!(email: "test@example.com", password: "password", password_confirmation: "password")
end
end
$ rails db:seed
rails aborted!
ActiveRecord::RecordInvalid: Validation failed: Email has already been taken
/Users/sakakin/rails/sample_sql/db/seeds.rb:3:in `block in <main>'
/Users/sakakin/rails/sample_sql/db/seeds.rb:2:in `<main>'
/Users/sakakin/rails/sample_sql/bin/rails:9:in `<top (required)>'
/Users/sakakin/rails/sample_sql/bin/spring:15:in `<top (required)>'
bin/rails:3:in `load'
bin/rails:3:in `<main>'
Tasks: TOP => db:seed
(See full trace by running task with --trace)
以上です。