Python 如何获取 Django 模型字段对象的值
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How to get the value of a Django Model Field object
提问by HuLu ViCa
I got a model field object using field_object = MyModel._meta.get_field(field_name). How can I get the value (content) of the field object?
我使用field_object = MyModel._meta.get_field(field_name). 如何获取字段对象的值（内容）？
回答by awesoon
Use value_from_object:
field_name = 'name'
obj = MyModel.objects.first()
field_object = MyModel._meta.get_field(field_name)
field_value = field_object.value_from_object(obj)
Which is the same as getattr:
这与以下内容相同getattr：
field_name = 'name'
obj = MyModel.objects.first()
field_object = MyModel._meta.get_field(field_name)
field_value = getattr(obj, field_object.attname)
Or if you know the field name and just want to get value using field name, you do not need to retrieve field object firstly:
或者，如果您知道字段名称并且只想使用字段名称获取值，则无需先检索字段对象：
field_name = 'name'
obj = MyModel.objects.first()
field_value = getattr(obj, field_name)
回答by JPG
Assuming you have a model as,
假设你有一个模型，
class SampleModel(models.Model):
name = models.CharField(max_length=120)Then you will get the value of namefield of model instance by,
然后你会得到name模型实例字段的值，
sample_instance = SampleModel.objects.get(id=1)
value_of_name = sample_instance.name回答by root
If you want to access it somewhere outside the model You can get it after making an object the Model. Using like this
如果您想在模型之外的某个地方访问它，您可以在将对象设为模型后获取它。像这样使用
OUSIDE THE MODEL CLAA:
在模型 CLAA 之外：
myModal = MyModel.objects.all()
print(myModel.field_object)
USING INSIDE MODEL CLASS
If you're using it inside class you can simply get it like this
使用内部模型类
如果你在类内部使用它，你可以像这样简单地得到它
print(self.field_object)
