NEWBIE：我正在尝试设置我网站的会员资格部分。我运行了以下命令：
git checkout development
git merge user_authentication
git checkout -b stripe_integration
bundle exec rails g migration CreatePlans
并收到此错误：
ActiveRecord::PendingMigrationError: Migrations are pending. To
resolve this issue, run: bin/rake db:migrate RAILS_ENV=development
我尝试过运行它和其他命令但没有成功。下面是该问题的其他Stack Overflow答案的链接，这些答案对我不起作用并且完整跟踪。
完整追踪：
kmcrayton7:~/workspace (stripe_integration) $ bin/rake db:migrate RAILS_ENV=development
== 20151209220651 AddDeviseToUsers: migrating =================================
-- change_table(:users)
rake aborted!
StandardError: An error has occurred, this and all later migrations canceled:
SQLite3::SQLException: duplicate column name: email: ALTER TABLE "users" ADD "email" varchar(255) DEFAULT '' NOT NULL/usr/local/rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `initialize'
/usr/local/rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `new'
/usr/local/rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `prepare'
/usr/local/rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:134:in `execute'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:331:in `block in execute'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract_adapter.rb:373:in `block in log'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.1.0/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract_adapter.rb:367:in `log'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:331:in `execute'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:375:in `add_column'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:454:in `add_column'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/schema_definitions.rb:490:in `block (3 levels) in <class:Table>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/schema_definitions.rb:489:in `each'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/schema_definitions.rb:489:in `block (2 levels) in <class:Table>'
/home/ubuntu/workspace/db/migrate/20151209220651_add_devise_to_users.rb:5:in `block in up'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:349:in `change_table'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:649:in `block in method_missing'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:621:in `block in say_with_time'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:621:in `say_with_time'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:641:in `method_missing'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:406:in `method_missing'
/home/ubuntu/workspace/db/migrate/20151209220651_add_devise_to_users.rb:3:in `up'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:558:in `up'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:598:in `exec_migration'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:579:in `block (2 levels) in migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:578:in `block in migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:294:in `with_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:577:in `migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:752:in `migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:992:in `block in execute_migration_in_transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:1038:in `block in ddl_transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `block in transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:219:in `within_new_transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/transactions.rb:208:in `transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:1038:in `ddl_transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:991:in `execute_migration_in_transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:953:in `block in migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:949:in `each'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:949:in `migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:807:in `up'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:785:in `migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/railties/databases.rake:34:in `block (2 levels) in <top (required)>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:241:in `load'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:241:in `block in load'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:232:in `load_dependency'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:241:in `load'
-e:1:in `<main>'
ActiveRecord::StatementInvalid: SQLite3::SQLException: duplicate column name: email: ALTER TABLE "users" ADD "email" varchar(255) DEFAULT '' NOT NULL
/usr/local/rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `initialize'
/usr/local/rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `new'
/usr/local/rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `prepare'
/usr/local/rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:134:in `execute'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:331:in `block in execute'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract_adapter.rb:373:in `block in log'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.1.0/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract_adapter.rb:367:in `log'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:331:in `execute'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:375:in `add_column'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:454:in `add_column'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/schema_definitions.rb:490:in `block (3 levels) in <class:Table>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/schema_definitions.rb:489:in `each'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/schema_definitions.rb:489:in `block (2 levels) in <class:Table>'
/home/ubuntu/workspace/db/migrate/20151209220651_add_devise_to_users.rb:5:in `block in up'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:349:in `change_table'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:649:in `block in method_missing'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:621:in `block in say_with_time'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:621:in `say_with_time'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:641:in `method_missing'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:406:in `method_missing'
/home/ubuntu/workspace/db/migrate/20151209220651_add_devise_to_users.rb:3:in `up'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:558:in `up'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:598:in `exec_migration'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:579:in `block (2 levels) in migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:578:in `block in migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:294:in `with_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:577:in `migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:752:in `migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:992:in `block in execute_migration_in_transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:1038:in `block in ddl_transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `block in transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:219:in `within_new_transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/transactions.rb:208:in `transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:1038:in `ddl_transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:991:in `execute_migration_in_transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:953:in `block in migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:949:in `each'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:949:in `migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:807:in `up'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:785:in `migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/railties/databases.rake:34:in `block (2 levels) in <top (required)>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:241:in `load'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:241:in `block in load'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:232:in `load_dependency'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:241:in `load'
-e:1:in `<main>'
SQLite3::SQLException: duplicate column name: email
/usr/local/rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `initialize'
/usr/local/rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `new'
/usr/local/rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:91:in `prepare'
/usr/local/rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.11/lib/sqlite3/database.rb:134:in `execute'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:331:in `block in execute'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract_adapter.rb:373:in `block in log'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.1.0/lib/active_support/notifications/instrumenter.rb:20:in `instrument'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract_adapter.rb:367:in `log'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:331:in `execute'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:375:in `add_column'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/sqlite3_adapter.rb:454:in `add_column'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/schema_definitions.rb:490:in `block (3 levels) in <class:Table>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/schema_definitions.rb:489:in `each'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/schema_definitions.rb:489:in `block (2 levels) in <class:Table>'
/home/ubuntu/workspace/db/migrate/20151209220651_add_devise_to_users.rb:5:in `block in up'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/schema_statements.rb:349:in `change_table'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:649:in `block in method_missing'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:621:in `block in say_with_time'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:621:in `say_with_time'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:641:in `method_missing'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:406:in `method_missing'
/home/ubuntu/workspace/db/migrate/20151209220651_add_devise_to_users.rb:3:in `up'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:558:in `up'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:598:in `exec_migration'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:579:in `block (2 levels) in migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:578:in `block in migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/connection_pool.rb:294:in `with_connection'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:577:in `migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:752:in `migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:992:in `block in execute_migration_in_transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:1038:in `block in ddl_transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `block in transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:219:in `within_new_transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/connection_adapters/abstract/database_statements.rb:211:in `transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/transactions.rb:208:in `transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:1038:in `ddl_transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:991:in `execute_migration_in_transaction'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:953:in `block in migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:949:in `each'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:949:in `migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:807:in `up'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/migration.rb:785:in `migrate'
/usr/local/rvm/gems/ruby-2.2.1/gems/activerecord-4.1.0/lib/active_record/railties/databases.rake:34:in `block (2 levels) in <top (required)>'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:241:in `load'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:241:in `block in load'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:232:in `load_dependency'
/usr/local/rvm/gems/ruby-2.2.1/gems/activesupport-4.1.0/lib/active_support/dependencies.rb:241:in `load'
-e:1:in `<main>'
Tasks: TOP => db:migrate
(See full trace by running task with --trace)
我应该从add_devise_to_user.rb文件中删除哪个电子邮件？
class AddDeviseToUsers < ActiveRecord::Migration
def self.up
change_table(:users) do |t|
## Database authenticatable
t.string :email, null: false, default: ""
t.string :encrypted_password, null: false, default: ""
## Recoverable
t.string :reset_password_token
t.datetime :reset_password_sent_at
## Rememberable
t.datetime :remember_created_at
## Trackable
t.integer :sign_in_count, default: 0, null: false
t.datetime :current_sign_in_at
t.datetime :last_sign_in_at
t.string :current_sign_in_ip
t.string :last_sign_in_ip
## Confirmable
# t.string :confirmation_token
# t.datetime :confirmed_at
# t.datetime :confirmation_sent_at
# t.string :unconfirmed_email # Only if using reconfirmable
## Lockable
# t.integer :failed_attempts, default: 0, null: false # Only if lock strategy is :failed_attempts
# t.string :unlock_token # Only if unlock strategy is :email or :both
# t.datetime :locked_at
# Uncomment below if timestamps were not included in your original model.
# t.timestamps
end
add_index :users, :email, unique: true
add_index :users, :reset_password_token, unique: true
# add_index :users, :confirmation_token, unique: true
# add_index :users, :unlock_token, unique: true
end
def self.down
# By default, we don't want to make any assumption about how to roll back a migration when your
# model already existed. Please edit below which fields you would like to remove in this migration.
raise ActiveRecord::IrreversibleMigration
end
end
答案 0 :(得分：1)
查看AddDeviseToUsers迁移错误堆栈跟踪，您可能会注意到您有一个重复的电子邮件列。您已在users表上有一个电子邮件列，并且特定的迁移正在尝试添加另一个。
我建议您编辑AddDeviseToUsers以删除电子邮件列创建。如果您不熟悉Rails目录结构，可以在db/migrate/xxxxxxxxxxx_add_devise_to_users.rb
我希望它有所帮助。