is not JSON serializable

Question

I have the following ListView  import json class CountryListView ListView        model   Country      def render to response self  context    response kwargs             return json dumps self get queryset   values list  code   flat True     But I get following error    u ae   u ag   u ai   u al   u am    u ao   u ar   u at   u au   u aw    u az   u ba   u bb   u bd   u be   u bg    u bh   u bl   u bm   u bn        remaining elements truncated        is not JSON serializable   Any ideas

User · Answer

class CountryListView ListView        model   Country      def render to response self  context    response kwargs             return HttpResponse json dumps list self get queryset   values list  code   flat True    mimetype  application json      fixed the problem  also mimetype is important

User · Answer

It s worth noting that the QuerySet values list   method doesn t actually return a list  but an object of type django db models query ValuesListQuerySet  in order to maintain Django s goal of lazy evaluation  i e  the DB query required to generate the  list  isn t actually performed until the object is evaluated   Somewhat irritatingly  though  this object has a custom   repr   method which makes it look like a list when printed out  so it s not always obvious that the object isn t really a list   The exception in the question is caused by the fact that custom objects cannot be serialized in JSON  so you ll have to convert it to a list first  with     my list   list self get queryset   values list  code   flat True        then you can convert it to JSON with     json data   json dumps my list    You ll also have to place the resulting JSON data in an HttpResponse object  which  apparently  should have a Content-Type of application json  with     response   HttpResponse json data  content type  application json        which you can then return from your function

[python] is not JSON serializable

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