迁移在 Ruby On Rails 中不起作用

Question

出于某种原因，我的 Ruby on Rails 应用程序告诉我它无法运行迁移。我不确定如何解决这个问题。我偶然创建了一个没有信息的表。然后我尝试删除迁移文件和它创建的表。当我尝试运行迁移命令时，它给了我这个错误：

rails aborted!
Don't know how to build task 'db:migration' (see --tasks)
/usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/railties-5.0.0/lib/rails/commands/rake_proxy.rb:13:in `block in run_rake_task'
/usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/railties-5.0.0/lib/rails/commands/rake_proxy.rb:10:in `run_rake_task'
/usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/railties-5.0.0/lib/rails/commands/commands_tasks.rb:51:in `run_command!'
/usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/railties-5.0.0/lib/rails/commands.rb:18:in `<top (required)>'
/home/ubuntu/workspace/saasapp/bin/rails:9:in `require'
/home/ubuntu/workspace/saasapp/bin/rails:9:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/spring-1.7.2/lib/spring/client/rails.rb:28:in `load'
/usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/spring-1.7.2/lib/spring/client/rails.rb:28:in `call'
/usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/spring-1.7.2/lib/spring/client/command.rb:7:in `call'
/usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/spring-1.7.2/lib/spring/client.rb:30:in `run'
/usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/spring-1.7.2/bin/spring:49:in `<top (required)>'
/usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/spring-1.7.2/lib/spring/binstub.rb:11:in `load'
/usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/spring-1.7.2/lib/spring/binstub.rb:11:in `<top (required)>'
/home/ubuntu/workspace/saasapp/bin/spring:15:in `require'
/home/ubuntu/workspace/saasapp/bin/spring:15:in `<top (required)>'
bin/rails:3:in `load'
bin/rails:3:in `<main>'
(See full trace by running task with --trace)

谁能帮我解决这个问题。我需要删除现有表，以便创建正确的表。它不会填充我的架构文件。

这是我在运行 rake db:migrate 时遇到的错误

rake db:migrate

== 20170322214259 CreateProfiles：迁移 =================================== -- change_table(:profiles) 耙中止！ StandardError：发生错误，此迁移和所有后续迁移已取消：

SQLite3::SQLException: 无法添加默认值为 NULL 的 NOT NULL 列：ALTER TABLE "profiles" ADD "created_at" datetime NOT NULL /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:91:in initialize' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:91:innew' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:91:in prepare' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:137:inexecute' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:232:in block in execute' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract_adapter.rb:566:inblock in log' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activesupport-5.0.0/lib/active_support/notifications/instrumenter.rb:21:in instrument' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract_adapter.rb:560:inlog' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:232:in execute' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:547:inadd_column' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:373:in add_column' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:1096:inadd_timestamps' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/schema_definitions.rb:525:in timestamps' /home/ubuntu/workspace/saasapp/db/migrate/20170322214259_create_profiles.rb:11:inblock in change' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:443:in change_table' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:845:inblock in method_missing' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:814:in block in say_with_time' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:814:insay_with_time' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:834:in method_missing' /home/ubuntu/workspace/saasapp/db/migrate/20170322214259_create_profiles.rb:3:inchange' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:788:in exec_migration' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:772:inblock (2 级) in migrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:771:in block in migrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:398:inwith_connection' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:770:in migrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:950:inmigrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1211:in block in execute_migration_in_transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1279:inblock in ddl_transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/database_statements.rb:232:in block in transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/transaction.rb:189:inwithin_new_transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/database_statements.rb:232:in transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/transactions.rb:211:intransaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1279:in ddl_transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1210:inexecute_migration_in_transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1183:in block in migrate_without_lock' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1182:ineach' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1182:in migrate_without_lock' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1133:inmigrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1005:in up' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:983:inmigrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/tasks/database_tasks.rb:161:in migrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/railties/databases.rake:58:inblock（2级）在' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/rake-12.0.0/exe/rake:27:in <top (required)>' /usr/local/rvm/gems/ruby-2.3.0@saasapp/bin/ruby_executable_hooks:15:ineval' /usr/local/rvm/gems/ruby-2.3.0@saasapp/bin/ruby_executable_hooks:15:in <main>' ActiveRecord::StatementInvalid: SQLite3::SQLException: Cannot add a NOT NULL column with default value NULL: ALTER TABLE "profiles" ADD "created_at" datetime NOT NULL /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:91:ininitialize' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:91:in new' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:91:inprepare' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:137:in execute' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:232:inblock 在执行' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract_adapter.rb:566:in block in log' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activesupport-5.0.0/lib/active_support/notifications/instrumenter.rb:21:ininstrument' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract_adapter.rb:560:in log' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:232:inexecute' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:547:in add_column' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:373:inadd_column' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:1096:in add_timestamps' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/schema_definitions.rb:525:intimestamps' /home/ubuntu/workspace/saasapp/db/migrate/20170322214259_create_profiles.rb:11:in block in change' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:443:inchange_table' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:845:in block in method_missing' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:814:inblock in say_with_time' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:814:in say_with_time' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:834:inmethod_missing' /home/ubuntu/workspace/saasapp/db/migrate/20170322214259_create_profiles.rb:3:in change' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:788:inexec_migration' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:772:in block (2 levels) in migrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:771:inblock in migrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:398:in with_connection' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:770:inmigrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:950:in migrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1211:inblock in execute_migration_in_transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1279:in block in ddl_transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/database_statements.rb:232:inblock in transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/transaction.rb:189:in within_new_transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/database_statements.rb:232:intransaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/transactions.rb:211:in transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1279:inddl_transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1210:in execute_migration_in_transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1183:inblock in migrate_without_lock' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1182:in each' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1182:inmigrate_without_lock' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1133:in migrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1005:inup' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:983:in migrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/tasks/database_tasks.rb:161:inmigrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/railties/databases.rake:58:in block (2 levels) in <top (required)>' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/rake-12.0.0/exe/rake:27:in' /usr/local/rvm/gems/ruby-2.3.0@saasapp/bin/ruby_executable_hooks:15:in eval' /usr/local/rvm/gems/ruby-2.3.0@saasapp/bin/ruby_executable_hooks:15:in' SQLite3::SQLException：无法添加默认值为 NULL 的 NOT NULL 列 /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:91:in initialize' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:91:innew' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:91:in prepare' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/sqlite3-1.3.13/lib/sqlite3/database.rb:137:inexecute' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:232:in block in execute' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract_adapter.rb:566:inblock in log' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activesupport-5.0.0/lib/active_support/notifications/instrumenter.rb:21:in instrument' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract_adapter.rb:560:inlog' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:232:in execute' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:547:inadd_column' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:373:in add_column' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:1096:inadd_timestamps' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/schema_definitions.rb:525:in timestamps' /home/ubuntu/workspace/saasapp/db/migrate/20170322214259_create_profiles.rb:11:inblock in change' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:443:in change_table' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:845:inblock in method_missing' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:814:in block in say_with_time' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:814:insay_with_time' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:834:in method_missing' /home/ubuntu/workspace/saasapp/db/migrate/20170322214259_create_profiles.rb:3:inchange' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:788:in exec_migration' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:772:inblock (2 个级别) in migrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:771:in block in migrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:398:inwith_connection' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:770:in migrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:950:inmigrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1211:in block in execute_migration_in_transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1279:inblock in ddl_transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/database_statements.rb:232:in block in transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/transaction.rb:189:inwithin_new_transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/connection_adapters/abstract/database_statements.rb:232:in transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/transactions.rb:211:intransaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1279:in ddl_transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1210:inexecute_migration_in_transaction' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1183:in block in migrate_without_lock' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1182:ineach' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1182:in migrate_without_lock' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1133:inmigrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:1005:in up' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/migration.rb:983:inmigrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/tasks/database_tasks.rb:161:in migrate' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/activerecord-5.0.0/lib/active_record/railties/databases.rake:58:inblock（2级）在' /usr/local/rvm/gems/ruby-2.3.0@saasapp/gems/rake-12.0.0/exe/rake:27:in <top (required)>' /usr/local/rvm/gems/ruby-2.3.0@saasapp/bin/ruby_executable_hooks:15:ineval' /usr/local/rvm/gems/ruby-2.3.0@saasapp/bin/ruby_executable_hooks:15:in `' 任务：TOP => db:migrate （通过使用 --trace 运行任务查看完整跟踪）

Answer 1

除了我建议您使用rake db:migrate 而不是rake db:migration 的评论：

如果您发现自己在生成模型/迁移时犯了错误，我还建议您查看 rake db:rollback。

Answer 2

我相信您使用的是迁移而不是迁移 rake db:migrate