对于某些模型实例,DRF序列化器将字段更改为read_only [英] DRF serializer change field to read_only for some model instances
本文介绍了对于某些模型实例,DRF序列化器将字段更改为read_only的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有这个模型:
class Task(MPTTModel, TimeStampedModel, StartFinishModel):
name = models.CharField(max_length=256)
parent = TreeForeignKey('self',
on_delete=models.CASCADE,
related_name='children')
start_date = models.DateField()
finish_date = models.DateField()
@property
def is_stage(self):
if self.get_children():
return True
return False
和序列化器:
class TaskBaseSerializer(StartFinishSerializer, TimeStampedSerializer):
class Meta:
model = Task
fields = ('id', 'name', 'parent', 'start_date', 'finish_date', 'is_stage')
read_only_fields = ('is_stage')
如果 is_stage
属性为 True '开始日期'和'finish_date'
变为只读>.我该怎么办?
I want to make fields 'start_date'
and 'finish_date'
to become read_only if is_stage
property is True. How can I do that?
推荐答案
尝试覆盖这样的 __ init __()
方法:
class TaskBaseSerializer(StartFinishSerializer, TimeStampedSerializer):
class Meta:
model = Task
fields = ('id', 'name', 'parent', 'start_date', 'finish_date', 'is_stage')
read_only_fields = ('is_stage')
def __init__(self, *args, **kwargs):
super(TaskBaseSerializer, self).__init__(*args, **kwargs)
if self.instance and getattr(self.instance, 'is_stage', None):
self.fields['start_date'].read_only = True
self.fields['finish_date'].read_only = True
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