Refs #373, Refs #24121 -- Added ColPairs.__repr__().

django/db/models/expressions.py

@@ -1342,6 +1342,12 @@ class ColPairs(Expression):
     def __iter__(self):
         return iter(self.get_cols())
 
+    def __repr__(self):
+        return (
+            f"{self.__class__.__name__}({self.alias!r}, {self.targets!r}, "
+            f"{self.sources!r}, {self.output_field!r})"
+        )
+
     def get_cols(self):
         return [
             Col(self.alias, target, source)

tests/expressions/tests.py

@@ -47,6 +47,7 @@ from django.db.models import (
 )
 from django.db.models.expressions import (
     Col,
+    ColPairs,
     Combinable,
     CombinedExpression,
     NegatedExpression,
@@ -2466,6 +2467,10 @@ class ReprTests(SimpleTestCase):
             "<When: WHEN <Q: (AND: ('age__gte', 18))> THEN Value('legal')>",
         )
         self.assertEqual(repr(Col("alias", "field")), "Col(alias, field)")
+        self.assertEqual(
+            repr(ColPairs("alias", ["t1", "t2"], ["s1", "s2"], "f")),
+            "ColPairs('alias', ['t1', 't2'], ['s1', 's2'], 'f')",
+        )
         self.assertEqual(repr(F("published")), "F(published)")
         self.assertEqual(
             repr(F("cost") + F("tax")), "<CombinedExpression: F(cost) + F(tax)>"