[英]Django rest framework represent flatten nested object
I have a parent and a one-to-one related child model and I would like to render the fields from the child flat in the parent representation ( read only
). 我有一个父级和一对一相关的子模型,我想在父级表示形式中将子级的字段呈现为平面(
read only
)。 Currently, I have achieved that with a custom to_representation
implementation but that seems very involved and I wonder if there is no easier way to achieve this. 目前,我已经通过自定义
to_representation
实现实现了这一点,但是这似乎非常to_representation
,我想知道是否没有更简单的方法可以实现这一点。
It is made more complicated by the fact that my related model is connected via a property. 我的相关模型通过属性连接的事实使情况变得更加复杂。
So here is the concrete example: By default a related object would be rendered like: 因此,这是一个具体示例:默认情况下,一个相关对象将呈现为:
{
parent_name:'Bob',
child:{
name:'Alice'
}
}
This is what I want and currently get with my to_representation
: 这就是我想要的,目前与我的
to_representation
:
{
parent_name:'Bob',
child_name:'Alice'
}
My models look like this: 我的模型如下所示:
class ChildModel(models.Model):
name = models.CharField(max_length=100, null=True)
class ParentModel(models.Model):
name = models.CharField(max_length=100, null=True)
_child = models.ForeignKey('ChildModel', null=True)
@property
def child(self):
return self._most_recent_status
@name.setter
def child(self, value):
self._child = value
Here are my serializers: 这是我的序列化器:
class FlatChildField(serializers.RelatedField):
def to_representation(self, value):
return value.name
class FlatParentSerializer(serializers.ModelSerializer):
parent_name = serializers.CharField(source='name', read_only=True)
child_name = FlatChildField(source='_child', read_only=True)
class Meta:
model = Parent
fields = ('name', 'child_name')
For a simpler solution to get a flat representation of related models I would be grateful. 对于一个更简单的解决方案来获得相关模型的统一表示,我将不胜感激。
For completeness, I would be interested to hear if there is a simpler solution for "normal" related models (ie not property model fields as well). 为了完整起见,我想听听是否有一种针对“常规”相关模型(即,也没有属性模型字段)的简单解决方案。 I was looking for the equivalent of the django model query syntax of
related_model__field
, but I cannot find that. 我一直在寻找的Django的模型查询语法相当于
related_model__field
,但我无法找到。 Does that exist for django rest framework? django rest框架是否存在?
Many thanks 非常感谢
The simplest means would be to use source : 最简单的方法是使用source :
class FlatParentSerializer(serializers.ModelSerializer):
parent_name = serializers.CharField(source='name', read_only=True)
child_name = serializers.CharField(source='_child.name', read_only=True)
class Meta:
model = Parent
fields = ('name', 'child_name')
You can use SerializerMethodField , it saves you really a lot of work and it's so clean and trivial: 您可以使用SerializerMethodField ,它确实为您节省了很多工作,而且非常简洁:
class FlatParentSerializer(serializers.ModelSerializer):
parent_name = serializers.CharField(source='name', read_only=True)
child_name = serializers.SerializerMethodField('get_child_name')
class Meta:
model = Parent
fields = ('name', 'child_name')
def get_child_name(self, obj):
return obj._child.name
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