Add old_id to account_user

apps/account/models.py

@@ -94,6 +94,8 @@ class User(AbstractUser):
     unconfirmed_email = models.EmailField(_('unconfirmed email'), blank=True, null=True, default=None)
     email_confirmed = models.BooleanField(_('email status'), default=False)
     newsletter = models.NullBooleanField(default=True)
+    old_id = models.IntegerField(null=True, blank=True, default=None)
+
 
     EMAIL_FIELD = 'email'
     USERNAME_FIELD = 'username'

apps/transfer/serializers/account.py

@@ -6,17 +6,20 @@ class UserSerializer(serializers.ModelSerializer):
     nickname = serializers.CharField()
     email = serializers.CharField()
     confirmed_at = serializers.DateTimeField()
+    id = serializers.CharField()
 
     class Meta:
         model = User
 
         fields = (
+            "id",
             "nickname",
             "email",
             "confirmed_at"
         )
 
     def validate(self, data):
+        data["old_id"] = data.pop("id")
         data["username"] = self.get_username(data)
         data["email_confirmed"] = self.get_email_confirmed(data)
         data.pop("nickname")