rails db:migrateでエラーが出ました

Question

###わからないこと

rails db:migrateでエラーが出ました。

$ bin/rails db:migrate RAILS_ENV=test
== 20170227042251 CreateUsers: migrating ======================================
-- create_table(:users)
rails aborted!
StandardError: An error has occurred, this and all later migrations canceled:

SQLite3::SQLException: table "users" already exists: CREATE TABLE "users" ("id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, "name" varchar, "email" varchar, "created_at" datetime NOT NULL, "updated_at" datetime NOT NULL)
/home/vagrant/workspace/myblog/db/migrate/20170227042251_create_users.rb:3:in `change'
/home/vagrant/workspace/myblog/bin/rails:9:in `require'
/home/vagrant/workspace/myblog/bin/rails:9:in `<top (required)>'
/home/vagrant/workspace/myblog/bin/spring:15:in `<top (required)>'
bin/rails:3:in `load'
bin/rails:3:in `<main>'
ActiveRecord::StatementInvalid: SQLite3::SQLException: table "users" already exists: CREATE TABLE "users" ("id" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, "name" varchar, "email" varchar, "created_at" datetime NOT NULL, "updated_at" datetime NOT NULL)
/home/vagrant/workspace/myblog/db/migrate/20170227042251_create_users.rb:3:in `change'
/home/vagrant/workspace/myblog/bin/rails:9:in `require'
/home/vagrant/workspace/myblog/bin/rails:9:in `<top (required)>'
/home/vagrant/workspace/myblog/bin/spring:15:in `<top (required)>'
bin/rails:3:in `load'
bin/rails:3:in `<main>'
SQLite3::SQLException: table "users" already exists
/home/vagrant/workspace/myblog/db/migrate/20170227042251_create_users.rb:3:in `change'
/home/vagrant/workspace/myblog/bin/rails:9:in `require'
/home/vagrant/workspace/myblog/bin/rails:9:in `<top (required)>'
/home/vagrant/workspace/myblog/bin/spring:15:in `<top (required)>'
bin/rails:3:in `load'
bin/rails:3:in `<main>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)
[vagrant@localhost myblog]$ Mysql3::Error: Table 'users' already exists
-bash: Mysql3::Error:: コマンドが見つかりません

rails test ができなくて、よくみたらmigrateでエラーが出ていました。
教えてくれると助かります。

###追記
<database.yml>

default: &default
  adapter: sqlite3
  pool: 5
  timeout: 5000

development:
  <<: *default
  database: db/development.sqlite3
test:
  <<: *default
  database: db/test.sqlite3

production:
  <<: *default
  database: db/production.sqlite3

Answer 1

昨日同じような質問に答えた気もしますが
testとdevelopmentとproduction
で同じデータベースを参照している場合（database.ymlを確認してみてください）

bin/rails db:migrate RAILS_ENV=test
同じデータベースに同じ名前のテーブルを作ろうとする
ことになります。
つまりそれはデータを全て消すということに異ならないので
エラーが出るわけです。
そもそも、testとproductionのデータベースが同じことが間違っていると思いますが。
それで問題がないのなら（テスト時にデータが消えて問題ないなら）
bin/rails db:migrate RAILS_ENV=test
が成功しなくても次のステップに進んで問題ありません。

Comments

[miiichat]

回答ありがとうございます！
rails tutorialをやっていて、rails t ができないのですがなにか原因があるのでしょうか？

$ rails test
Running via Spring preloader in process 17137
/home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.1/lib/active_record/migration.rb:573:in `check_pending!': (ActiveRecord::PendingMigrationError)

Migrations are pending. To resolve this issue, run:

bin/rails db:migrate RAILS_ENV=test

from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.1/lib/active_record/migration.rb:586:in `load_schema_if_pending!'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.1/lib/active_record/migration.rb:592:in `block in maintain_test_schema!'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.1/lib/active_record/migration.rb:823:in `suppress_messages'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.1/lib/active_record/migration.rb:597:in `method_missing'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activerecord-5.0.1/lib/active_record/migration.rb:592:in `maintain_test_schema!'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.1/lib/rails/test_help.rb:15:in `<top (required)>'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `block in require'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
from /home/vagrant/workspace/myblog/test/test_helper.rb:3:in `<top (required)>'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `block in require'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
from /home/vagrant/workspace/myblog/test/controllers/account_activations_controller_test.rb:1:in `<top (required)>'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `block in require'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:259:in `load_dependency'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-5.0.1/lib/active_support/dependencies.rb:293:in `require'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.1/lib/rails/test_unit/test_requirer.rb:11:in `block in require_files'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.1/lib/rails/test_unit/test_requirer.rb:10:in `each'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.1/lib/rails/test_unit/test_requirer.rb:10:in `require_files'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.1/lib/rails/test_unit/minitest_plugin.rb:86:in `plugin_rails_init'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/minitest-5.10.1/lib/minitest.rb:80:in `block in init_plugins'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/minitest-5.10.1/lib/minitest.rb:78:in `each'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/minitest-5.10.1/lib/minitest.rb:78:in `init_plugins'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/minitest-5.10.1/lib/minitest.rb:129:in `run'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/railties-5.0.1/lib/rails/test_unit/minitest_plugin.rb:73:in `run'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/minitest-5.10.1/lib/minitest.rb:62:in `block in autorun'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from /home/vagrant/.rbenv/versions/2.3.1/lib/ruby/2.3.0/rubygems/core_ext/kernel_require.rb:55:in `require'
from -e:1:in `<main>'

[moke]

すみません、嘘ついたかもしれないです。
とりあえずtest用のdbを作成して
config/database.yml
のtestの項目をtest用のdatabaseに指定してください
指定されている場合はtest用databaseのすべてのテーブルを削除し
てもう一度migrationを行なってください

やってみてわからなかった場合はdatabase.ymlを質問に追記してください

[miiichat]

回答ありがとうございます！
とりあえず載せときます。

test用databaseの作り方は、これでいいでしょうか？
rake db:create RAILS_ENV=test

今, rails tutorialをやっているのですが、そのような指示はなかったと思います。

[miiichat]

rails t　をすると、
ActiveRecord::PendingMigrationError
とでますが、関係ありますか？

[miiichat]

githubに置いてあったものを持ってきてやり直しました。