Output Django queryset as JSON

Question

I want to serialize my queryset  and I want it in a format as this view outputs   class JSONListView ListView       queryset   Users objects all        def get self  request   args    kwargs           return HttpResponse json dumps   data      bar   foo   bar   foo     foo   bar   foo   bar      indent 4   content type  application json     I simply don t know how to output the queryset instead of the manual data in the example   I ve tried  json dumps   data   self get queryset       and  serializers serialize  json     data   self get queryset       but it wont work  What am I doing wrong  Do I need to make a custom JSON Encoder

User · Answer

Try this   class JSONListView ListView       queryset   Users objects all         def get self  request   args    kwargs           data              data  users     get json list queryset          return JSONResponse data    def get json list query set       list objects          for obj in query set          dict obj              for field in obj  meta get fields                try                  if field many to many                      dict obj field name    get json list getattr obj  field name  all                        continue                 dict obj field name    getattr obj  field name              except AttributeError                  continue         list objects append dict obj      return list objects

User · Answer

To return the queryset you retrieved with queryset   Users objects all    you first need to serialize them  Serialization is the process of converting one data structure to another  Using Class-Based Views  you could return JSON like this  from django core serializers import serialize from django http import JsonResponse from django views generic import View  class JSONListView View       def get self  request   args    kwargs           qs   User objects all           data   serialize  quot json quot   qs          return JsonResponse data   This will output a list of JSON  For more detail on how this works  check out my blog article How to return a JSON Response with Django  It goes into more detail on how you would go about this

User · Answer

from django http import JsonResponse def SomeFunction    dict1         obj   list  Mymodel objects values         dict1  data   obj  return JsonResponse dict1  Try this code for Django

User · Answer

If the goal is to build an API that allow you to access your models in JSON format I recommend you to use the django-restframework that is an enormously popular package within the Django community to achieve this type of tasks   Django Rest Framework Website Github  It include useful features such as Pagination  Defining Serializers  Nested models relations and more  Even if you only want to do minor Javascript tasks and Ajax calls I would still suggest you to build a proper API using the Django Rest Framework instead of manually defining the JSON response

User · Answer

For a efficient solution  you can use  values   function to get a list of dict objects and then dump it to json response by using i e  JsonResponse  remember to set safe False    Once you have your desired queryset object  transform it to JSON response like this       data   list queryset values    return JsonResponse data  safe False    You can specify field names in  values   function in order to return only wanted fields  the example above will return all model fields in json objects

User · Answer

You can use JsonResponse with values  Simple example   from django http import JsonResponse  def some view request       data   list SomeModel objects values       wrap in list    because QuerySet is not JSON serializable     return JsonResponse data  safe False     or JsonResponse   data   data     Or another approach with Django s built-in serializers   from django core import serializers from django http import HttpResponse  def some view request       qs   SomeModel objects all       qs json   serializers serialize  json   qs      return HttpResponse qs json  content type  application json     In this case result is slightly different  without indent by default                     model    some app some model            pk   1           fields                  name    Elon                age   48                                               I have to say  it is good practice to use something like marshmallow to serialize queryset      and a few notes for better performance    use pagination if your queryset is big  use objects values   to specify list of required fields to avoid serialization and sending to client unnecessary model s fields  you also can pass fields to serializers serialize

User · Answer

It didn t work  because QuerySets are not JSON serializable   1  In case of json dumps you have to explicitely convert your QuerySet to JSON serializable objects   class Model model Model       def as dict self           return                id   self id                other stuff             And the serialization   dictionaries     obj as dict   for obj in self get queryset     return HttpResponse json dumps   data   dictionaries    content type  application json     2  In case of serializers  Serializers accept either JSON serializable object or QuerySet  but a dictionary containing a QuerySet is neither  Try this   serializers serialize  json   self get queryset      Read more about it here   https   docs djangoproject com en dev topics serialization

[django] Output Django queryset as JSON

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