耙分贝：迁移返回错误

Question

我跑耙分贝：迁移和我在终端

SQLite3::SQLException: no such table: admin_users: ALTER TABLE "admin_users" ADD "username" varchar(25)/Users/IsaiahxD/.rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.10/lib/sqlite3/database.rb:91:in `initialize' 
/Users/IsaiahxD/.rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.10/lib/sqlite3/database.rb:91:in `new' 
/Users/IsaiahxD/.rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.10/lib/sqlite3/database.rb:91:in `prepare' 
/Users/IsaiahxD/.rvm/gems/ruby-2.2.1/gems/sqlite3-1.3.10/lib/sqlite3/database.rb:134:in `execute' 
/Users/IsaiahxD/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.3/lib/active_record/connection_adapters/sqlite3_adapter.rb:329:in `block in execute' 
/Users/IsaiahxD/.rvm/gems/ruby-2.2.1/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract_adapter.rb:473:in `block in log' 

碰到这个错误就我看着我的alter_user.rb文件class AlterUsers < ActiveRecord::Migration

这是文件20150825065823_alter_users。 RB

def up 
    rename_table("users", "admin_users.broken") 
    add_column("admin_users", "username", :string, :limit => 25, :after => "email") 
    change_column("admin_users", "email", :string, :limit => 100) 
    rename_column("admin_users", "broken", "hashed_password") 
    puts "*** Adding an index is next ***" 
    add_index("admin_users", "username") 
end 

def down 
    remove_index("admin_users", "username") 
    rename_column("admin_users", "hashed_password", "password") 
    change_column("admin_users", "email", :string, :default => "" , :null => false) 
    remove_column("admin_users", "username") 
    rename_table("admin_users", "users") 
end 

Answer 1

在你#up方法，您要添加列admin_users但你没有定义的表呢。

相反的：

rename_table("users", "admin_users.broken")

尝试：

rename_table("users", "admin_users")