Django模型檢測用戶是否正在試圖改變一個字段

Question

我保存模型，我需要檢測用戶是否正在試圖改變一個領域，並顯示錯誤：

def save(self, *args, **kwargs): 

    if self.status is being changed: 
      error you cannot do that! 

豈今做的是Django的

Answer 1

看看django-dirtyfields包可以幫助你，引自文檔：

(ve)$ ./manage.py shell 
>>> from testing_app.models import TestModel 
>>> tm = TestModel(boolean=True,characters="testing") 
>>> tm.save() 
>>> tm.is_dirty() 
False 
>>> tm.get_dirty_fields() 
{} 
>>> tm.boolean = False 
>>> tm.is_dirty() 
True 
>>> tm.get_dirty_fields() 
{'boolean': True} 
>>> tm.characters = "have changed" 
>>> tm.is_dirty() 
True 
>>> tm.get_dirty_fields() 
{'boolean': True, 'characters': 'testing'} 
>>> tm.save() 
>>> tm.is_dirty() 
False 
>>> tm.get_dirty_fields() 
{} 
>>> 

另見：

• Django: Check If a Field has Changed
• Detect if a model has changed before calling save in Django
• In Django 1.4, do Form.has_changed() and Form.changed_data, which are undocumented, work as expected?

希望有所幫助。