django - Model field required on -

i change "required" property field in model clean() method.

here's model:

class somemodel(models.model):     type = models.charfield()     attr1 = models.foreignkey(attr1, blank=true, null=true)     attrs2 = models.foreignkey(attr2, blank=true, null=true) 

right doing in modelform __init__ adding new parameter view. dynamically sets required fields.

can achieve same in models? using django-rest-framework api (it's using modelform) full_clean() (that includes clean_fields() , clean()) run.

say attr1/attr2 fields required if type starts string.

i know can check in model.clean() land non_field_errors then.

def clean(self):     if self.type.startswith("somestring"):         if self.attr1 none , self.attr2 none:             raise validationerror("attr1 , attr2 required..") 

i rather see these errors attached attr1 , attr2 field errors simple "this field required" (standard "required" django error).

here code example work fine me:

def clean(self):         is_current = self.cleaned_data.get('is_current',false)         if not is_current:             start_date = self.cleaned_data.get('start_date', false)             end_date   = self.cleaned_data.get('end_date', false)             if start_date , end_date , start_date >= end_date:                 self._errors['start_date'] = validationerror(_('start date should before end date.')).messages         else:             self.cleaned_data['end_date']=none         return self.cleaned_data