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AssertionError: `HyperlinkedIdentityField` requires the request in the serializer context. Add `context={'request': request}` when instantiating the serializer.

老師這個報錯是什么情況

慕運維2186032

2021-03-08

源自：Django REST framework前后端分離框架實踐 3-4

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慕妹4270370
2021-03-08

class?CourseSerializer(serializers.ModelSerializer):
????teacher?=?serializers.ReadOnlyField(source='teacher.username')?#?外鍵字段只讀
????class?Meta:
????????model?=?Course
????????#?exclude?=?("id",)?#?注意元組中只有1個元素時不能寫成("id")
????????#?fields?=?('name',?'introduction',?'teacher',?'price')
????????fields?=?'__all__'
????????depth?=?2

#?class?CourseSerializer(serializers.HyperlinkedModelSerializer):
#?????teacher?=?serializers.ReadOnlyField(source='teacher.username')?#?外鍵字段只讀
#?????class?Meta:
#?????????model?=?Course
#?????????#?url是默認值，?可在settings.py中設置URL_FIELD_NAME使全局生效
#?????????fields?=?('id','url',?'name',?'introduction',?'teacher',?'price')

用上面的