python - multiplechoicefield - how to update the list of choices on each page load -

i have multiplechoicefield shown here:

 ratesheets = serializers.multiplechoicefield(choices=ratesheet_choices, allow_blank=false) 

and ratesheet_choices populated here (also showing above in context):

class ratesheetscomparisonserializer(serializers.hyperlinkedmodelserializer):      ratesheet_choices = []      def __init__(self, *args, **kwargs):         rs in ratesheet.objects.all():             self.ratesheet_choices.append((rs.pk, rs.title))         super(ratesheetscomparisonserializer, self).__init__(*args, **kwargs)  ...      ratesheets = serializers.multiplechoicefield(choices=ratesheet_choices, allow_blank=false) 

the problem i'm having multiplechoicefield stays same until restart server. how update choices each time load page. need put same code somewhere else? it's taken me long time here , can't find kind of stuff seem me. thanks!

add ratesheets field not class variable (which static!) in __init__ method:

class ratesheetscomparisonserializer(serializers.hyperlinkedmodelserializer):      def __init__(self, *args, **kwargs):         super(ratesheetscomparisonserializer, self).__init__(*args, **kwargs)         rateshield_choices = []         rs in ratesheet.objects.all():             ratesheet_choices.append((rs.pk, rs.title))         self.fields['ratesheets'] = serializers.multiplechoicefield(choices=ratesheet_choices, allow_blank=false) 

(i'm assuming these serializers work similar django forms, self.fields guess , dictionary might named differently)

edit: 1 more thing needed

change meta class from:

class meta:     model = ratesheetscomparison     fields = ('created', 'ratesheets',)     read_only_fields = ('created',) 

to:

class meta:     model = ratesheetscomparison     fields = ('created',)     read_only_fields = ('created',) 

or else you'll importerror because thought ratesheets existed couldn't find it.