【发布时间】：2019-04-17 17:23:00
【问题描述】：
我正在使用“rake db:migrate”并收到以下错误消息： 请帮我解决这个问题：
# rake db:migrate rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:
Directly inheriting from ActiveRecord::Migration is not supported. Please specify the Rails release the migration was written for:
class CreateUsers < ActiveRecord::Migration[4.2]
/var/lib/gems/2.3.0/gems/activerecord-5.2.1/lib/active_record/migration.rb:528:in `inherited'
/root/genieacs-gui/db/migrate/20160202145722_create_users.rb:1:in `<top (required)>'
/var/lib/gems/2.3.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `require'
/var/lib/gems/2.3.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `block in require'
/var/lib/gems/2.3.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:253:in `load_dependency'
/var/lib/gems/2.3.0/gems/activesupport-5.2.1/lib/active_support/dependencies.rb:287:in `require'
/var/lib/gems/2.3.0/gems/activerecord-5.2.1/lib/active_record/migration.rb:986:in `load_migration'
/var/lib/gems/2.3.0/gems/activerecord-5.2.1/lib/active_record/migration.rb:982:in `migration'
/var/lib/gems/2.3.0/gems/activerecord-5.2.1/lib/active_record/migration.rb:977:in `disable_ddl_transaction'
/var/lib/gems/2.3.0/gems/activerecord-5.2.1/lib/active_record/migration.rb:1350:in `use_transaction?'
/var/lib/gems/2.3.0/gems/activerecord-5.2.1/lib/active_record/migration.rb:1342:in `ddl_transaction'
/var/lib/gems/2.3.0/gems/activerecord-5.2.1/lib/active_record/migration.rb:1291:in `execute_migration_in_transaction'
/var/lib/gems/2.3.0/gems/activerecord-5.2.1/lib/active_record/migration.rb:1263:in `block in migrate_without_lock'
/var/lib/gems/2.3.0/gems/activerecord-5.2.1/lib/active_record/migration.rb:1262:in `each'
/var/lib/gems/2.3.0/gems/activerecord-5.2.1/lib/active_record/migration.rb:1262:in `migrate_without_lock'
/var/lib/gems/2.3.0/gems/activerecord-5.2.1/lib/active_record/migration.rb:1212:in `migrate'
/var/lib/gems/2.3.0/gems/activerecord-5.2.1/lib/active_record/migration.rb:1036:in `up'
/var/lib/gems/2.3.0/gems/activerecord-5.2.1/lib/active_record/migration.rb:1011:in `migrate'
/var/lib/gems/2.3.0/gems/activerecord-5.2.1/lib/active_record/tasks/database_tasks.rb:172:in `migrate'
/var/lib/gems/2.3.0/gems/activerecord-5.2.1/lib/active_record/railties/databases.rake:60:in `block (2 levels) in <top (required)>'
/var/lib/gems/2.3.0/gems/rake-12.3.1/exe/rake:27:in `<top (required)>'
#...
Tasks: TOP => db:migrate
【问题讨论】：
-
错误的第一行解释了要做什么
标签： ruby-on-rails ruby rubygems rake-task dbmigrate