使用ListField序列化多个InMemoryUploadedFile:Django REST Framework [英] Serialize multiple InMemoryUploadedFile using ListField : Django REST Framework
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问题描述
如何序列化多个 InMemoryUploadedFile
使用 serializers.ListField()
??
How can I serialize multiple InMemoryUploadedFile
using serializers.ListField()
??
代码段
#views.py
@api_view(['POST', 'GET'])
def create_post(request):
if request.method == 'POST':
altered_request_data = request.data.copy()
in_memory_upload_files_list = [value for value in request.FILES.values()]
altered_request_data['files'] = in_memory_upload_files_list
serializer = PostSerializer(data=altered_request_data)
serializer.is_valid(raise_exception=True)
serializer.save()
return Response(data=serializer.data, status=201)
else:
qs = Post.objects.all()
serializer = PostSerializer(qs, many=True)
return Response(serializer.data)
#serilizers.py
class PostSerializer(serializers.ModelSerializer):
files = serializers.ListField(child=serializers.FileField(), write_only=True)
class Meta:
fields = '__all__'
model = Post
当前响应
{
"files": {
"0": [
"The submitted data was not a file. Check the encoding type on the form."
]
}
}
推荐答案
问题出在这一行,
altered_request_data['files'] = in_memory_upload_files_list
此处 altered_request_data
是 QueryDict
对象,因此,如果我们为其分配任何内容,则会调用
here the altered_request_data
is a QueryDict
object, so if we assign anything to it will call the __setitem__()
method
In [6]: from django.http import QueryDict
In [7]: qd = QueryDict('a=1&a=2&c=3',mutable=True)
In [8]: qd
Out[8]: <QueryDict: {'a': ['1', '2'], 'c': ['3']}>
In [9]: my_list = [i for i in range(10)]
In [10]: my_list
Out[10]: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
In [11]: qd['foo']=my_list
In [12]: qd
Out[12]: <QueryDict: {'a': ['1', '2'], 'c': ['3'], 'foo': [[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]]}>
看到了吗? qd['foo']
成为 列表列表 .也就是说,分配给 QueryDict
的所有内容都将存储在list
对象中.
See that? qd['foo']
become a list of list. That is, anything assigning to a QueryDict
will be stored inside a list
object.
QueryDict
类具有方法 QueryDict.setlist
会完成工作
QueryDict
class has a method QueryDict.setlist
will do the job
In [15]: qd__new
Out[15]:
In [16]: qd__new = QueryDict('a=1&a=2&c=3',mutable=True)
In [17]: qd__new
Out[17]: <QueryDict: {'a': ['1', '2'], 'c': ['3']}>
In [18]: my_list
Out[18]: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
In [19]: qd__new.setlist('foo_new',my_list)
In [20]: qd__new
Out[20]: <QueryDict: {'a': ['1', '2'], 'c': ['3'], 'foo_new': [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]}>
代码段
views.py
@api_view(['POST', 'GET'])
def create_post(request):
if request.method == 'POST':
altered_request_data = request.data.copy()
in_memory_upload_files_list = [value for value in request.FILES.dict().values()]
altered_request_data.setlist('files', in_memory_upload_files_list)
serializer = PostSerializer(data=altered_request_data)
serializer.is_valid(raise_exception=True)
serializer.save()
return Response(data=serializer.data, status=201)
else:
qs = Post.objects.all()
serializer = PostSerializer(qs, many=True)
return Response(serializer.data)
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