Question

从现有数据库开始，我想更新它的架构。我改变了我的一个模型，然后运行

python manage.py makemigrations myapp

创建迁移，正确定义新表和列。样本输出：

Migrations for 'myapp':
  0001_initial.py:
    - Create model Foo
    - Add field Bar
    - ...

然后我应用迁移：

python manage.py migrate --database mydb

我得到了这个输出：

Operations to perform:
  Apply all migrations: admin, myapp, contenttypes, sessions, auth
Running migrations:
  Rendering model states... DONE
  Applying admin.0002_logentry_remove_auto_add... OK
  Applying auth.0007_alter_validators_add_error_messages... OK

似乎有效。 Git告诉我sqlite文件对应于＆＃34; mydb＆＃34;已经改变。但是，它不是将我的新表和列放在里面，而是删除内容，留下带有旧模式的空表。

我做错了什么？

Answer 1

如果您有未应用迁移的旧数据库，则应创建'---------TIMER MACRO--------' 'PURPOSE: Determine how many seconds it took for code to completely run 'SOURCE: www.TheSpreadsheetGuru.com/the-code-vault Dim StartTime As Double Dim SecondsElapsed As Double Dim minutesElapsed As Double 'Remember time when macro starts StartTime = Timer '************************************* '------Start to run code--------' '************************************* Your code goes here '************************************* '----------End code----------' '************************************* 'Determine how many seconds code took to run 'If you want in seconds with two decimals, use this line: 'SecondsElapsed = Round(Timer - StartTime, 2) 'If you want with up to 7 decimals, use this line: SecondsElapsed = Timer - StartTime 'Notify user how long the macro took If SecondsElapsed > 60 Then minutesElapsed = Int(SecondsElapsed / 60) SecondsElapsed = Int(SecondsElapsed - (minutesElapsed * 60)) Msgbox "This code ran successfully in " & minutesElapsed & " minutes and " & SecondsElapsed & " seconds", vbInformation Else Msgbox "This code ran successfully in " & SecondsElapsed & " seconds", vbInformation End If而不进行任何更改：

initial migrations

然后运行“假”迁移

python manage.py makemigrations myapp

之后，您可以使用正常迁移。

Django迁移不会更新我的数据库

1 个答案: