Python 向可翻译的Django模型动态添加属性
因此,我想向一个模型添加属性,类似于另一个模型的属性,该模型包含可翻译字段 我的模型:Python 向可翻译的Django模型动态添加属性,python,django,properties,model,Python,Django,Properties,Model,因此,我想向一个模型添加属性,类似于另一个模型的属性,该模型包含可翻译字段 我的模型: class MyModel(models.Model): ... fields ... class MyModelTranslation(models.Model): ... the fields I want on MyModel ... name = models.CharField() city = models.CharField() language = m
class MyModel(models.Model):
... fields ...
class MyModelTranslation(models.Model):
... the fields I want on MyModel ...
name = models.CharField()
city = models.CharField()
language = models.CharField()
mymodel = models.ForeignKey(MyModel)
所以我写了下面的\uuuu init\uuuu
class MyModel(models.Model):
...
def __init__(self, *args, **kwargs):
super(Model, self).__init__(*args, **kwargs)
# get_translation gets the object, that holds the translation fields for the
# current active language
trans = lambda c: c.get_translation()
setattr(self.__class__, 'translation', property(trans))
fget = lambda c: getattr(trans(c), 'name')
fset = lambda c, v: setattr(trans(c), 'name', v)
setattr(self.__class__, 'name', property(fget, fset))
fget = lambda c: getattr(trans(c), 'city')
fset = lambda c, v: setattr(trans(c), 'city', v)
setattr(self.__class__, 'city', property(fget, fset))
这很好用。然后,当我调用mymodel.name
时,我得到了活动语言的mymodeltransformation.name
。也可以设置此值
因为我想动态地创建它,以便在mixin中使用它,所以我将它添加到for循环中,如下所示:
def __init__(self, *args, **kwargs):
super(Model, self).__init__(*args, **kwargs)
trans = lambda c: c.get_translation()
setattr(self.__class__, 'translation', property(trans))
# returns all fields of the translation model
trans_fields = [field.name for field in [
related for related in self._meta.get_all_related_objects()
if "translation" in related.name
][0].model._meta.fields]
# should then assign all those fields dynamically
for name in trans_fields:
if not name == 'id' and not name == 'mymodel':
fget = lambda c: getattr(trans(c), name)
fset = lambda c, v: setattr(trans(c), name, v)
setattr(self.__class__, name, property(fget, fset))
所以我想,好吧,因为name
值类似于我以前手动添加的字段名称,所以它应该在for循环的每次运行中添加一个属性,其名称为name
。
但事实并非如此。当我调用mymodel.name
时,它返回模型实例(因此基本上self
)。我不知道有什么不同,当我在forloop中而不是全部手动执行时
有什么想法吗?你可以用django transmeta之类的东西。。。。有一些关于此问题的应用程序