我創建了一個名爲「users」的模型,並且我創建了一個新的遷移,將一些列添加到users表中。現在,當我運行耙分貝:遷移,我得到下面的二/三它試圖創建用戶表再次創建遷移以添加列到表的Rails導致運行rake數據庫時出錯:遷移
$ 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`.....
爲什麼嘗試重新創建表的錯誤?
這是我用來創建新的遷移
$ 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
新的遷移看起來像這樣的命令:
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
編輯
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
個
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
從輸出看起來好像在DeviseCreateUsers期間發生錯誤,而不是在您的新遷移中。您是否有另一個(舊的)遷移已經創建了Users表? – fwalch
是的,我願意。但我認爲我應該能夠像我一樣添加新的遷移並運行rake數據庫:遷移應該只運行尚未運行的遷移。 – Catfish
新遷移甚至沒有運行;好像你有另外兩個都試圖創建用戶表('DeviseCreateUsers'和一個較老的遷移)。你應該改變'DeviseCreateUsers'來使用'add_column's而不是試圖創建表。 – fwalch