如何用“枚举”迭代“ dict”

Question

I have the following code. This just show me one user instead of all the users I have inside my JSON, and also I have another problem, when I'm concatenating my strings it show me a "\\" after I put a '"':

def get(self, request, format=None):
    users = Caseworker.objects.all()
    response = self.serializer(users, many=True)
    for j in range(0,len(response.data)):
     dictionary = response.data[j]
     myresponse = ""


    for i, (val, v) in enumerate(dictionary.items()):
         myresponse = myresponse + '{"text":' + '"' + v + '"' + '}' + ','
         print(myresponse)
    # for i,(k,v) in enumerate(dictionary.items()):
    #   myresponse = myresponse + '{"text":' + '"' + v + '"' + '}' + ','
    #   print(myresponse)

    return HttpResponse(json.dumps({'messages': myresponse}), content_type='application/json')

I got registered two different users

With this code I need that all my users appear in http://127.0.0.1:8000/panel/api , but instead that, everytime I add a new one, is the unique that appear in here.

In this image is the example, I added a new one and is the unique user I can visualize.

Answer 1

The problem is that {'messages': myresponse} is a dictionary that has a string representing JSON* as a value to 'messages' , which is why you see the back-slash escapes behind the " character, because that is a json string , not a json-object. You should work entirely in the realm of python objects then deserialize at the end, don't mix the two, because you are getting exactly what you ask for. Instead:

myresponse = [{"text":v} for v in dictionary.values()]

*Really, that string isn't even json, but it looks like a "tuple" of JSON-objects.

To be more explicit, you are confusing the following two things, what you want is:

>>> d = {"foo":"bar"}
>>> json.dumps({"messeges":d})
'{"messeges": {"foo": "bar"}}'

What you are doing:

>>> json.dumps({"messeges":'{"foo":"bar"}'}) # notice '{"foo":"bar"}' is a string
'{"messeges": "{\\"foo\\":\\"bar\\"}"}'