我创建了一个名为“users”的模型,并创建了一个新的迁移以将一些列添加到 users 表中。现在,当我运行 rake db:migrate 时,我在 b/c 下面得到错误,它正在尝试再次创建用户表
$ rake db:migrate
== DeviseCreateUsers: migrating ==============================================
-- create_table(:users)
rake aborted!
An error has occurred, all later migrations canceled:
Mysql::Error: Table 'users' already exists: CREATE TABLE `users`.....
为什么它试图再次创建表?
这是我用来创建新迁移的命令
$ rails generate migration AddDetailsToUsers home_phone:decimal cell_phone:decimal work_phone:decimal birthday:date home_address:text work_address:text position:string company:string
新的迁移如下所示:
class AddDetailsToUsers < ActiveRecord::Migration
def change
add_column :users, :home_phone, :decimal
add_column :users, :cell_phone, :decimal
add_column :users, :work_phone, :decimal
add_column :users, :birthday, :date
add_column :users, :home_address, :text
add_column :users, :work_address, :text
add_column :users, :position, :string
add_column :users, :company, :string
end
end
编辑
20120511224920_devise_create_users
class DeviseCreateUsers < ActiveRecord::Migration
def change
create_table(:users) do |t|
## Database authenticatable
t.string :email, :null => false, :default => ""
t.string :username, :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
t.datetime :current_sign_in_at
t.datetime :last_sign_in_at
t.string :current_sign_in_ip
t.string :last_sign_in_ip
## Encryptable
# t.string :password_salt
## 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 # Only if lock strategy is :failed_attempts
# t.string :unlock_token # Only if unlock strategy is :email or :both
# t.datetime :locked_at
## Token authenticatable
# t.string :authentication_token
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
# add_index :users, :authentication_token, :unique => true
end
end
20120619023856_add_name_to_users
class AddNameToUsers < ActiveRecord::Migration
def change
add_column :users, :first_name, :string
add_column :users, :last_name, :string
end
end
20121031174720_add_details_to_users.rb
class AddDetailsToUsers < ActiveRecord::Migration
def change
add_column :users, :home_phone, :decimal
add_column :users, :cell_phone, :decimal
add_column :users, :work_phone, :decimal
add_column :users, :birthday, :date
add_column :users, :home_address, :text
add_column :users, :work_address, :text
add_column :users, :position, :string
add_column :users, :company, :string
end
end