由于某种原因，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。我创建了一张没有任何信息的表格。然后，我尝试删除迁移文件及其创建的表。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)
有人可以帮我解决这个问题。我需要删除现有的表，以便我可以创建正确的表。它不会填充我的模式文件。
这是我运行rake db：migrate
时得到的错误rake db:migrate
== 20170322214259 CreateProfiles：迁移=================================== - change_table（：个人资料） 耙子流产了！ StandardError：发生错误，此以及所有后续迁移都已取消：
SQLite3 :: SQLException：无法添加具有默认值NULL的NOT NULL列：ALTER TABLE＆＃34; profiles＆＃34; ADD＆＃34; created_at＆＃34; 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:in new＆＃39;
/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:in执行＆＃39;
/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:in阻止日志＆＃39;
/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:in log＆＃39;
/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:in add_column＆＃39;
/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:in add_timestamps＆＃39;
/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:in阻止变化＆＃39 ;
/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:in阻止method_missing＆＃39 ;
/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:in say_with_time＆＃39;
/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:in更改＆＃39;
/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:in阻止（2级）迁移＆＃39 ;
/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:in with_connection＆＃39;
/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:in migrate＆＃39;
/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:in阻止ddl_transaction＆＃39;
/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:in within_new_transaction＆＃39;
/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:in transaction＆＃39;
/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:in execute_migration_in_transaction＆＃39;
/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:in每个＆＃39;
/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:in migrate＆＃39;
/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:in migrate＆＃39;
/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:in阻止（2级）＆ ＃39;
/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:in eval＆＃39;
/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:in初始化＆＃39;
/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:in准备＆＃39;
/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:in阻止执行＆＃39;
/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:in instrument＆＃39;
/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:in执行＆＃39;
/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:in add_column＆＃39;
/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:in时间戳＆＃39;
/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:in change_table＆＃39;
/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:in阻止在say_with_time＆＃39;
/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:in method_missing＆＃39;
/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:in exec_migration＆＃39;
/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:in阻止迁移＆＃39;
/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:in migrate＆＃39;
/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:in块中的execute_migration_in_transaction＆＃39;
/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:in阻止交易＆＃39;
/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:in transaction＆＃39;
/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:in ddl_transaction＆＃39;
/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:in阻止在migrate_without_lock＆＃39;
/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:in migrate_without_lock＆＃39;
/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:in up＆＃39;
/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:in migrate＆＃39;
/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＆＃39;
/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＆＃39;
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:in new＆＃39;
/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:in执行＆＃39;
/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:in阻止日志＆＃39;
/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:in log＆＃39;
/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:in add_column＆＃39;
/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:in add_timestamps＆＃39;
/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:in阻止变化＆＃39 ;
/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:in阻止method_missing＆＃39 ;
/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:in say_with_time＆＃39;
/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:in更改＆＃39;
/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:in阻止（2级）迁移＆＃39 ;
/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:in with_connection＆＃39;
/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:in migrate＆＃39;
/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:in阻止ddl_transaction＆＃39;
/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:in within_new_transaction＆＃39;
/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:in transaction＆＃39;
/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:in execute_migration_in_transaction＆＃39;
/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:in每个＆＃39;
/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:in migrate＆＃39;
/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:in migrate＆＃39;
/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:in阻止（2级）＆ ＃39;
/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:in eval＆＃39;
/usr/local/rvm/gems/ruby-2.3.0@saasapp/bin/ruby_executable_hooks：15：in`＆＃39;
任务：TOP =＆gt; DB：迁移
（通过使用--trace运行任务查看完整跟踪）
答案 0 :(得分：0)
我相信您已使用迁移而非迁移
rake db:migrate
答案 1 :(得分：0)
除了我的评论，建议您使用rake db:migrate代替rake db:migration：
如果您在生成模型/迁移时发现错误，我还建议您查看rake db:rollback。