fix: prevent unique constraint error by handling unverified emails

Author: Mohmmde1

dj_rest_auth/registration/serializers.py

@@ -237,18 +237,20 @@ def validate_username(self, username):
 
     def validate_email(self, email):
         email = get_adapter().clean_email(email)
+
         if allauth_account_settings.UNIQUE_EMAIL:
             existing_email = EmailAddress.objects.filter(email=email).first()
+            
             if existing_email:
-                if existing_email.verified:
-                    raise serializers.ValidationError(
-                        "A user is already registered with this email address."
-                    )
-                elif allauth_account_settings.EMAIL_VERIFICATION == \
+                if not existing_email.verified and allauth_account_settings.EMAIL_VERIFICATION == \
                     allauth_account_settings.EmailVerificationMethod.MANDATORY:
                     raise serializers.ValidationError(
                         "This email is already in use but has not been verified."
                     )
+                raise serializers.ValidationError(
+                    "A user is already registered with this email address."
+                )
+
         return email
 
     def validate_password1(self, password):