The inline foreign key did not match the parent instance primary key.

[Ajay Kumar]

I'm trying to set custom id for my model,

models.py

from django.db import models
import uuid


def get_ref_id():
 ref_id = str(uuid.uuid4())[:11].replace('-','').lower()
 try:
 id_exists = Sample.objecsts.get(ref_id = ref_id)
 get_ref_id()
 except:
 return ref_id


class Sample(models.Model):
 ref_id = models.CharField(max_length = 128, primary_key = True, default=get_ref_id)
 email = models.EmailField(max_length=128,unique=True)


 def __unicode__(self):
 return self.email


class MobileNumber(models.Model):
 sample = models.ForeignKey(Sample)
 mobile_number = models.CharField(max_length=128)

admin.py

from django.contrib import admin
from sample.models import Sample, MobileNumber


class MobileNumberInline(admin.StackedInline):
 model = MobileNumber
 extra = 1


class SampleAdmin(admin.ModelAdmin):
 inlines = [MobileNumberInline]


admin.site.register(Sample,SampleAdmin)

When i try to insert a record from admin it shows the error, But when i tried only with parent table it works.When i came to add child table its not working.Its just shows "Please correct the error below".And then i tried to save through userinterface views(out of admin) it shows the following error "The inline foreign key did not match the parent instance primary key".