英文:
django - get serializer output into another serializer
问题
我想将一个序列化器 'RoomSerializer' 的输出放入 'JoinRoomSerializer' 的字段中。
我尝试将 'RoomSerializer' 作为一个变量传递给 'JoinRoomSerializer'，然后在 'fields' 中传递它，但是我得到了以下错误：在序列化器 'JoinedRoomSerializer' 上尝试获取字段 'room_extends' 的值时出现了 AttributeError。
序列化器字段的命名可能不正确，与 'UserRoom' 实例上的任何属性或键不匹配。
原始异常文本为：'UserRoom' 对象没有属性 'room_extends'。
Room 模型有一个字段名，JoinRoom 模型有一个对 room 的外键。
我的序列化器：
class RoomSerializer(serializers.ModelSerializer):
"""Serializer for displaying all fields of the Room"""
class Meta():
model = Room
fields = ['name']
class JoinedRoomSerializer(serializers.ModelSerializer):
"""Serializer for displaying the following fields of the joined UserRoom table"""
room_extends = RoomSerializer(many=True)
class Meta():
model = UserRoom
fields = ['room_extends', 'date_joined']
英文:
I want to get the output of one serializer 'RoomSerializer' into 'JoinRoomSerializer's fields.
I have tried to get the 'RoomSerializer' as a variable into 'JoinRoomSerializer' and then pass it in 'fields', but im getting the following error: Got AttributeError when attempting to get a value for field room_extends on serializer JoinedRoomSerializer.
The serializer field might be named incorrectly and not match any attribute or key on the UserRoom instance.
Original exception text was: 'UserRoom' object has no attribute 'room_extends'.
The Room model has field name and JoinRoom model has foreign key to room
My serializers:
class RoomSerializer(serializers.ModelSerializer):
"""Serializer for displaying all fields of the Room"""
class Meta():
model = Room
fields = ['name']
class JoinedRoomSerializer(serializers.ModelSerializer):
"""Serializer for displaying the following fields of the joined UserRoom table"""
room_extends = RoomSerializer(many=True)
class Meta():
model = UserRoom
fields = ['room_extends', 'date_joined']
答案1
得分: 0
你正在使用ModelSerializer，所以在Meta类中，你必须指定模型拥有的字段。我几乎可以确定，在你的情况下，外键字段的名称不是room_extends，这导致了错误。
class RoomSerializer(serializers.ModelSerializer):
"""用于显示Room所有字段的序列化器"""
class Meta:
model = Room
fields = ['name']
class JoinedRoomSerializer(serializers.ModelSerializer):
"""用于显示已加入的UserRoom表的以下字段的序列化器"""
room = RoomSerializer(many=True) # 变量名与UserRoom模型中的相同
class Meta:
model = UserRoom
fields = ['room', 'date_joined']
或者你可以使用source：
class RoomSerializer(serializers.ModelSerializer):
"""用于显示Room所有字段的序列化器"""
class Meta:
model = Room
fields = ['name']
class JoinedRoomSerializer(serializers.ModelSerializer):
"""用于显示已加入的UserRoom表的以下字段的序列化器"""
room_extends = RoomSerializer(many=True, source='room') # room或者是外键字段的名称
class Meta:
model = UserRoom
fields = ['room_extends', 'date_joined']
英文:
You are using ModelSerializer so you in Meta class you have to specify fields that your model has. I am almost sure in your case foreign key field is not named room_extends and this cases the error
class RoomSerializer(serializers.ModelSerializer):
"""Serializer for displaying all fields of the Room"""
class Meta():
model = Room
fields = ['name']
class JoinedRoomSerializer(serializers.ModelSerializer):
"""Serializer for displaying the following fields of the joined UserRoom table"""
room = RoomSerializer(many=True) # name of variable same as in UserRoom model
class Meta():
model = UserRoom
fields = ['room', 'date_joined']
Or you can use source
class RoomSerializer(serializers.ModelSerializer):
"""Serializer for displaying all fields of the Room"""
class Meta():
model = Room
fields = ['name']
class JoinedRoomSerializer(serializers.ModelSerializer):
"""Serializer for displaying the following fields of the joined UserRoom table"""
room_extends = RoomSerializer(many=True, source='room') # room or whatever is foreignkey field name
class Meta():
model = UserRoom
fields = ['room_extends', 'date_joined']
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