Django Rest框架如何保存基于ID的相关字段的模型 [英] Django Rest Framework how to save a model with Related Field based on ID

问题描述

我很喜欢DRF。我有记录模型，如下所示：

 类记录（models.Model）：
 owner = models.ForeignKey （User，null = True）
 activity = models.ForeignKey（Activity，null = True）
 time_start = models.DateTimeField（null = True）
 time_end = models.DateTimeField（null = True ）
 
 ... 
  

RecordSerializer是这样的：

  class RecordSerializer（serializers.ModelSerializer）：
 
 now = datetime.today（）
 owner = serializers.Field（source ='owner.username'）
 time_start = serializers.DateTimeField（source ='now'）
 
 class Meta：
 model = Records 
 fields =（owner，activity，time_start）
  

这是视图：

  class StartApiView（generics.CreateAPIView）：
 model = Records 
 serializer_class = RecordSerializer 
 
 def pre_save（self，obj）：
 obj.owner = self.request.user 
  

POST请求是从Backbone发送的，包含一个包含活动ID的字段，例如{activity：12}。如果我希望视图保存记录，并将活动设置为12的ID为活动，该怎么办？

解决方案

Django REST框架提供一个 PrimaryKeyRelatedField 完全是这个用例。

  class RecordSerializer（serializers.ModelSerializer）：
 activity = serializers.PrimaryKeyRelatedField（）
 owner = serializers.CharField（read_only = True，source ='owner.username'）
 time_start = serializers.DateTimeField（source ='now'）
 
 class Meta：
 model = Records 
 fields =（owner，activity，time_start）
  

这将产生与您要查找的输出相似的输出，当您要更新它时，它将接受活动的 id 。

I'm kind of new to DRF. I have Record model that looks like this:

class Records(models.Model):
    owner = models.ForeignKey(User, null=True)
    activity = models.ForeignKey(Activity, null=True)
    time_start = models.DateTimeField(null=True)
    time_end = models.DateTimeField(null=True)

  ...

The RecordSerializer is this one:

class RecordSerializer(serializers.ModelSerializer):

    now = datetime.today()
    owner = serializers.Field(source='owner.username')
    time_start = serializers.DateTimeField(source='now')

    class Meta:
        model = Records
        fields = ("owner", "activity", "time_start")

And this is the view:

class StartApiView(generics.CreateAPIView):
    model = Records
    serializer_class = RecordSerializer

    def pre_save(self, obj):
        obj.owner = self.request.user

The POST request is sent from Backbone and it includes a field with the activity id, for example "{activity:12}". What should I do if I want the view to save the Record and set the activity to the Activity with the id of 12?

解决方案

Django REST Framework provides a PrimaryKeyRelatedField for exactly this use case.

class RecordSerializer(serializers.ModelSerializer):
    activity = serializers.PrimaryKeyRelatedField()
    owner = serializers.CharField(read_only=True, source='owner.username')
    time_start = serializers.DateTimeField(source='now')

    class Meta:
        model = Records
        fields = ("owner", "activity", "time_start")

This will produce output similar to what you are looking for, and it will accept the id of the activity when you want to update it.

这篇关于Django Rest框架如何保存基于ID的相关字段的模型的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！