执行rake db：migrate命令时，我一直收到以下错误：
耙子流产了！ 发生错误，此以及所有后续迁移都已取消： SQLite3 :: SQLException：重复的列名：email：ALTER TABLE“users”ADD“email”varchar（255）DEFAULT''NOT NULL我也尝试过命令 - bundle exec rake db：migrate。我跑了--trace并得到了信息。下面。
**调用db：migrate（first_time） **调用环境（first_time） **执行环境 **调用db：load_config（first_time） **执行db：load_config **执行db：migrate == AddDeviseToUsers：迁移============================================= == - change_table（：用户） 耙子流产了！ 发生错误，此操作和所有后续迁移都已取消：
SQLite3 :: SQLException：重复的列名：email：ALTER TABLE“users”ADD“email”varchar（255）DEFAULT''NOT NULL
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/sqlite3-1.3.7/lib/sqlite3/database.rb:91:in initialize'
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/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activesupport-3.2.12/lib/active_support/notifications/instrumenter.rb:20:in instrument'
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/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/schema_statements.rb:264:in add_column'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/connection_adapters/sqlite_adapter.rb:400:in add_column'
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/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/schema_definitions.rb:468:in string'
/Users/ddorrick/code/onrails/db/migrate/20130321170702_add_devise_to_users.rb:5:in block in up'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/schema_statements.rb:243:in change_table'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:466:in block in method_missing'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:438:in阻止在say_with_time'
/usr/local/rvm/rubies/ruby-1.9.3-p392/lib/ruby/1.9.1/benchmark.rb:280:in measure'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:438:in say_with_time'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:458:in method_missing'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:334:in method_missing'
/Users/ddorrick/code/onrails/db/migrate/20130321170702_add_devise_to_users.rb:3:in up'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:370:in up'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:410:in block (2 levels) in migrate'
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/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:410:in block in migrate'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/connection_pool.rb:129:in with_connection'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:389:in migrate'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:528:in migrate'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:720:in block (2 levels) in migrate'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:775:in call'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:775:in block in ddl_transaction'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/connection_adapters/abstract/database_statements.rb:192:in transaction'
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/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:775:in ddl_transaction'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:719:in block in migrate'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:700:in each'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:700:in migrate'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:570:in up'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/migration.rb:551:in migrate'
/usr/local/rvm/gems/ruby-1.9.3-p392/gems/activerecord-3.2.12/lib/active_record/railties/databases.rake:179:in阻止（2级）
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任务：TOP =＆gt;分贝：迁移
答案 0 :(得分：0)
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