如何在两个Django应用程序之间移动模型（Django 1.7） [英] How to move a model between two Django apps (Django 1.7)

问题描述

所以大约一年前，我开始一个项目，像所有的新开发人员一样，我并没有把重点放在结构上，但是现在我和Django一起开始出现，我的项目布局主要是我的模型可怕的结构。

我的模型主要是在一个单一的应用程序，真的大多数这些模型应该在自己的个人应用程序，我尝试解决这个并移动他们与南方，但我发现它很棘手，真的很困难，因为外键等。

然而由于Django 1.7和内置的支持迁移是有更好的方式做这是现在吗？

提前感谢您的帮助。

解决方案

注意： ozan answer 比我的更好。请使用该方法

CREATING APPS&模型

1）创建两个应用程序， app1 & app2 。

  $ python manage.py startapp app1 
 $ python manage.py startapp app2 
  

2）创建两个模型 model1 & model2 。

app1 / model1.py

 从django.db导入模型
 
 class model1（models.Model）：
 name = models。 CharField（max_length = 100）
  

app2 / model2.py

从$ d $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ .CharField（max_length = 100）
  

3）应用迁移。 p>

  $ python manage.py makemigrations app1&& python migrate app1 
 $ python manage.py makemigrations app2&& python迁移app2 
  

Django将创建2个表 app1_model & app2_model2 。您可以向模型添加数据。

让我们在模型中添加一些数据，以确保在移动模型时保留数据。

 在[1]中：from apps.app1.models import model1 
 
在[2]中：model1.objects.create（）
 Out [2]：< model1：model1 object> 
 
在[3]中：model1.objects.create（）
 Out [3]：< model1：model1 object> 
  

MIGRATING MODEL

让我们来看看如何执行实际的迁移。

4）重命名Table&移动源代码
转到数据库并将 app1_model 重命名为 app2_model1 。将 model1 的源代码从 app1 移动到 app2 &添加元选项。

app1 / model1.py

 code>从django.db导入模型
  

app2 / model2.py

 从django.db导入模型
 
 class model2（models.Model）：
 name = models.CharField（max_length = 100）
 
 class model1（models.Model）：
 name = models.CharField（max_length = 100）
 
类Meta：
 managed = False 
 db_table ='app2_model1'
  

5）应用迁移。
应用两个应用的迁移。

  $ python manage.py makemigrations app2& python manage.py migrate app2 
 $ python manage.py makemigrations app1&& python manage.py migrate --fake app1 
  

迁移完成后，您可以检查模型。

 在[1]中：from apps.app2.models import model1 
 
在[2 ]：model1.objects.all（）
 Out [2]：[< model1：model1 object>< model1：model1 object>] 
  

So about a year ago I started a project and like all new developers I didn't really focus to much on the structure, however now I am further along with Django it has started to appear that my project layout mainly my models are horrible in structure.

I have models mainly held in a single app and really most of these models should be in their own individual apps, I did try and resolve this and move them with south however I found it tricky and really difficult due to foreign keys ect.

However due to Django 1.7 and built in support for migrations is there a better way to do this now?

Thank you in advance for any help.

解决方案

Note: ozan answer is better than mine. Please use that method

CREATING APPS & MODELS

1) Create two apps, app1 & app2.

$ python manage.py startapp app1
$ python manage.py startapp app2

2) Create two models model1 & model2.

app1/model1.py

from django.db import models

class model1(models.Model):
    name  = models.CharField(max_length=100)

app2/model2.py

from django.db import models

class model1(models.Model):
    name  = models.CharField(max_length=100)

3) Apply migrations.

$ python manage.py makemigrations app1 && python migrate app1
$ python manage.py makemigrations app2 && python migrate app2

Django will create 2 tables app1_model & app2_model2. You can add data to models.

Lets add little data into our models, to make sure we preserve data while moving model.

In [1]: from apps.app1.models import model1

In [2]: model1.objects.create()
Out[2]: <model1: model1 object>

In [3]: model1.objects.create()
Out[3]: <model1: model1 object>

MIGRATING MODEL

Lets look how to perform the actual migration.

4) Rename Table & Move Source Code Go to your database and rename app1_model to app2_model1. Move source code for model1 from app1 to app2 & add meta options.

app1/model1.py

from django.db import models

app2/model2.py

from django.db import models

class model2(models.Model):
    name = models.CharField(max_length=100)

class model1(models.Model):
    name  = models.CharField(max_length=100)

class Meta:
    managed = False
    db_table = 'app2_model1'

5) Apply Migrations. Apply migrations for both apps.

$ python manage.py makemigrations app2 && python manage.py migrate app2
$ python manage.py makemigrations app1 && python manage.py migrate --fake app1

Once migrations are completed, you can check the data in the model.

In [1]: from apps.app2.models import model1

In [2]: model1.objects.all()
Out[2]: [<model1: model1 object>, <model1: model1 object>]

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