rails のカラムの型を変更したい

Question

現在integer のカラムの型をstringに変更しようとしたのですがエラーが出てしまい行うことが出来ません

rails g migration change_datatype_user_id _ of _ user

class ChangeDatatypeuser_idofUsers < ActiveRecord::Migration[5.2]
  def change
    change_column :users, :user_Id,:string
  end
end

rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:

SQLite3::ConstraintException: FOREIGN KEY constraint failed: DROP TABLE "users"
/Library/Ruby/Gems/2.3.0/gems/sqlite3-1.4.1/lib/sqlite3/resultset.rb:170:in `step'
/Library/Ruby/Gems/2.3.0/gems/sqlite3-1.4.1/lib/sqlite3/resultset.rb:170:in `next_hash'
/Library/Ruby/Gems/2.3.0/gems/sqlite3-1.4.1/lib/sqlite3/resultset.rb:105:in `next'
/Library/Ruby/Gems/2.3.0/gems/sqlite3-1.4.1/lib/sqlite3/resultset.rb:133:in `each'
/Library/Ruby/Gems/2.3.0/gems/sqlite3-1.4.1/lib/sqlite3/database.rb:202:in `to_a'
/Library/Ruby/Gems/2.3.0/gems/sqlite3-1.4.1/lib/sqlite3/database.rb:202:in `block in execute'
/Library/Ruby/Gems/2.3.0/gems/sqlite3-1.4.1/lib/sqlite3/database.rb:151:in `prepare'
/Library/Ruby/Gems/2.3.0/gems/sqlite3-1.4.1/lib/sqlite3/database.rb:193:in `execute'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/sqlite3_adapter.rb:255:in `block (2 levels) in execute'
/Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.3/lib/active_support/dependencies/interlock.rb:48:in `block in permit_concurrent_loads'
/Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.3/lib/active_support/concurrency/share_lock.rb:187:in `yield_shares'
/Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.3/lib/active_support/dependencies/interlock.rb:47:in `permit_concurrent_loads'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/sqlite3_adapter.rb:254:in `block in execute'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract_adapter.rb:581:in `block (2 levels) in log'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract_adapter.rb:580:in `block in log'
/Library/Ruby/Gems/2.3.0/gems/activesupport-5.2.3/lib/active_support/notifications/instrumenter.rb:23:in `instrument'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract_adapter.rb:571:in `log'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/sqlite3_adapter.rb:253:in `execute'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract/schema_statements.rb:496:in `drop_table'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/sqlite3_adapter.rb:421:in `move_table'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/sqlite3_adapter.rb:413:in `block in alter_table'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract/database_statements.rb:265:in `transaction'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/sqlite3_adapter.rb:412:in `alter_table'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/sqlite3_adapter.rb:332:in `change_column'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:871:in `block in method_missing'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:840:in `block in say_with_time'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:840:in `say_with_time'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:860:in `method_missing'
/Users/nakagawajo/nexceed/project/Tool_management/db/migrate/20190722064806_change_datatype_rf_idof_tools.rb:3:in `change'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:814:in `exec_migration'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:798:in `block (2 levels) in migrate'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:797:in `block in migrate'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:416:in `with_connection'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:796:in `migrate'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:977:in `migrate'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:1292:in `block in execute_migration_in_transaction'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:1343:in `block in ddl_transaction'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract/database_statements.rb:267:in `block in transaction'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract/transaction.rb:239:in `block in within_new_transaction'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract/transaction.rb:236:in `within_new_transaction'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/connection_adapters/abstract/database_statements.rb:267:in `transaction'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/transactions.rb:212:in `transaction'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:1343:in `ddl_transaction'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:1291:in `execute_migration_in_transaction'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:1263:in `block in migrate_without_lock'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:1262:in `each'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:1262:in `migrate_without_lock'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:1212:in `migrate'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:1036:in `up'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/migration.rb:1011:in `migrate'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/tasks/database_tasks.rb:172:in `migrate'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/railties/databases.rake:60:in `block (2 levels) in <main>'
/Library/Ruby/Gems/2.3.0/gems/rake-12.3.2/exe/rake:27:in `<top (required)>'

Caused by:
ActiveRecord::InvalidForeignKey: SQLite3::ConstraintException: FOREIGN KEY constraint failed: DROP TABLE "users"
Caused by:
SQLite3::ConstraintException: FOREIGN KEY constraint failed

/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/tasks/database_tasks.rb:172:in `migrate'
/Library/Ruby/Gems/2.3.0/gems/activerecord-5.2.3/lib/active_record/railties/databases.rake:60:in `block (2 levels) in <main>'
/Library/Ruby/Gems/2.3.0/gems/rake-12.3.2/exe/rake:27:in `<top (required)>'
Tasks: TOP => db:migrate

わかる方いればよろしくお願いしたします

Answer 1

似たような話があります。

Answer 2

ログに出力されていますが、

SQLite3::ConstraintException: FOREIGN KEY constraint failed: DROP TABLE "users"

カラムの型を変更するために users テーブルをドロップして作り直そうとして外部キー制約に引っかかっているようですね。
おそらく users テーブルを参照しているテーブルも参照しているIDの型を変更する必要がありますからドロップすることになるでしょう。

Comments

[jotaku]

なぜエラーになるか分かりました
中間テーブルにproject_user tableがあるからですかね
どのようにすれば変更可能になりますかね？

[mather]

「あとから変更」ではなく一度作り直してはいかがでしょうか。
すでに公開されているサービスであればそうも行かないでしょうが…。

[jotaku]

作り直すと言いますとDB設計のところをというところですかね？

[mather]

create_tableを修正して
rake db:migrate:reset
などで drop, create, migrate を実施すれば良いと思います。

[jotaku]

resetをかけることで完了いたしました