Add caller field

nplusone/core/listeners.py

@@ -1,5 +1,6 @@
 # -*- coding: utf-8 -*-
 
+from nplusone.core.stack import get_caller
 import six
 import fnmatch
 from collections import defaultdict
@@ -39,13 +40,15 @@ class Message(object):
     def __init__(self, model, field):
         self.model = model
         self.field = field
+        self.caller = get_caller()
 
     @property
     def message(self):
         return self.formatter.format(
             label=self.label,
             model=self.model.__name__,
             field=self.field,
+            caller=f"{self.caller.filename}:{self.caller.lineno} in {self.caller.function}",
         )
 
     def match(self, rules):
@@ -57,7 +60,7 @@ def match(self, rules):
 
 class LazyLoadMessage(Message):
     label = 'n_plus_one'
-    formatter = 'Potential n+1 query detected on `{model}.{field}`'
+    formatter = 'Potential n+1 query detected on `{model}.{field}` at {caller}'
 
 
 class EagerLoadMessage(Message):