Django 1.7同步未迁移的应用程序

我开始制作我的模型：

class MyModel(models.Model):

    field_a = models.FloatField()
    field_b = models.FloatField()
    field_c = models.FloatField()

myapp.models.py

class MyModel(models.Model):

    field_a = models.FloatField()
    field_c = models.FloatField()

然后在我的新项目上运行了

/manage.py migrate

，一切都很好：

Operations to perform:
  Synchronize unmigrated apps: myapp
  Apply all migrations: admin, contenttypes, auth, sessions
Synchronizing apps without migrations:
  Creating tables...
    Creating table myapp_mymodel
  Installing custom SQL...
  Installing indexes...
Running migrations:
  Applying contenttypes.0001_initial... OK
  Applying auth.0001_initial... OK
  Applying admin.0001_initial... OK
  Applying sessions.0001_initial... OK

然后我改变了我的模型：

class MyModel(models.Model):

    field_a = models.FloatField()
    field_b = models.FloatField()
    field_c = models.FloatField()

我再次运行了

/manage.py migrate

，但什么也没发生

(project)$ ./manage.py migrate 
Operations to perform:
  Synchronize unmigrated apps: myapp
  Apply all migrations: admin, contenttypes, auth, sessions
Synchronizing apps without migrations:
  Creating tables...
  Installing custom SQL...
  Installing indexes...
Running migrations:
  No migrations to apply.

---

我想知道我需要做些什么才能让我的新应用迁移？

Ack，回答了我自己的问题

我需要做的是运行：

./manage.py makemigrations myapp

---

如果即使运行了makemigrations命令，也会发生这种情况，则需要检查migrations文件夹中是否存在\uuuu initial\uuuuuuuuuuuuy.py空文件。有一次，我通过在测试远程服务器上运行来创建迁移，尽管我已将所有创建的迁移复制到我的代码中，但我忘记复制占位符空文件，以帮助migrate命令识别要运行迁移的应用程序

希望它能帮助别人