Django模型字段getter / setter [英] Django model fields getter / setter
问题描述
例如,我有一个文本字段,我需要在保存字符串之前进行字符串替换(在管理面板中,用于插入和更新操作)和做出另一个,不同的替换,每次读取。那些字符串替换是动态的,需要在保存和读取的时候完成。
当我使用python 2.5时,我不能使用python 2.6 getters / setters。
任何帮助?
您还可以覆盖setattr和getattr 。例如,假设你想标记一个字段脏,你可能会有这样的东西:
class MyModel:
_name_dirty = False
name = models.TextField()
def __setattr __(self,attrname,val):
super(MyModel,self).__ setattr __(attrname ,val)
self._name_dirty = True如果attrname =='name'
def __getattr __(self,attrname):
如果attrname = ='name'和self._name_dirty:
raise('你应该得到一个干净的副本或保存此对象')
返回超级(MyModel,self).__ getattr __(attrname)
is there something like getters and setters for django model's fields?
For example, I have a text field in which i need to make a string replace before it get saved (in the admin panel, for both insert and update operations) and make another, different replace each time it is read. Those string replace are dynamic and need to be done at the moment of saving and reading.
As I'm using python 2.5, I cannot use python 2.6 getters / setters.
Any help?
You can also override setattr and getattr. For example, say you wanted to mark a field dirty, you might have something like this:
class MyModel:
_name_dirty = False
name = models.TextField()
def __setattr__(self, attrname, val):
super(MyModel, self).__setattr__(attrname, val)
self._name_dirty = True if attrname == 'name'
def __getattr__(self, attrname):
if attrname == 'name' and self._name_dirty:
raise('You should get a clean copy or save this object.')
return super(MyModel, self).__getattr__(attrname)
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