DJANGO: object of type map is not JSON serializable

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Hello my fellow brothers and sisters, i have been trying to take an integer value in the database and add/remove +/- 1, whenever i click on a button, its been killing me heating my head back and forth would appreciate the help. Thank YOU.

MYVIEWS.PY

<br />
def subs(request, pk):<br />
	sw = Swimmers.objects.filter(id=pk).values('sessions')<br />
	sw_list = map(int,sw)<br />
	sw_list = map(lambda x: x + 1, sw_list)<br />
	return JsonResponse(sw_list, safe=False)</pre><br />

MYMODELS.PY

<br />
<pre>class Swimmers(models.Model):<br />
	name = models.CharField(max_length=200, blank=False)<br />
	lastname = models.CharField(max_length=200, blank=False)<br />
	idno = models.CharField(max_length=200, blank=False, null=True)<br />
	sessions = models.IntegerField(blank=False)<br />
	totalsessions = models.CharField(max_length=200, blank=False )<br />
	dateofpayment = models.CharField(max_length=200, blank=False)<br />
	session = models.ForeignKey(Session, on_delete=models.SET_NULL, null=True)<br />
<br />
	def __str__(self):<br />
		return self.name</pre><br />

What I have tried:

i have tried making calculations on the model side but i works automatically rather than when i click on a button, so i tried to move my code to the VIEWS.PY

Posted 8-Apr-22 21:29pm

crevs ftb

Updated 8-Apr-22 23:08pm

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markkuk · Accepted Answer · 2022-04-08T23:08:00

Solution 1

The map() function[^] returns an iterator and you must convert it to a list before you can serialize it.

Python

return JsonResponse(list(sw_list), safe=False)

Posted 8-Apr-22 23:08pm

markkuk

Comments

crevs ftb 9-Apr-22 6:10am

Thank YOU For The Reply, i added list but encountered an error:

int() argument must be a string, a bytes-like object or a number, not 'dict'

crevs ftb 9-Apr-22 6:12am

def subs(request, pk):
sw = Swimmers.objects.filter(id=pk).values('sessions')
sw_list = map(int, sw)
sw_list = map(lambda x: x + 1, sw_list)
return JsonResponse(list(sw_list), safe=False)

crevs ftb 9-Apr-22 10:40am

Hello Thank YOU Again, I managed to sort out the error by adding an index to int, but i am faced with a new error: invalid literal for int() with base 10: 'sessions'

MYNEWCODE
def subs(request, pk):
sw = Swimmers.objects.filter(id=pk).values('sessions')
sw_list = map(int, sw [0])
sw_list = map(lambda x: x + 1, sw_list )
return JsonResponse(list(sw_list), safe=False)