Fixed #28507 -- Made ValidationError.__eq__() ignore messages and params ordering.

Co-authored-by: caleb logan <clogan202@gmail.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/django/core/exceptions.py b/django/core/exceptions.py
index dc084b8692..2b3e55fe49 100644
--- a/django/core/exceptions.py
+++ b/django/core/exceptions.py
@@ -1,6 +1,9 @@
 """
 Global Django exception and warning classes.
 """
+import operator
+
+from django.utils.hashable import make_hashable
 
 
 class FieldDoesNotExist(Exception):
@@ -182,6 +185,23 @@ class ValidationError(Exception):
     def __repr__(self):
         return 'ValidationError(%s)' % self
 
+    def __eq__(self, other):
+        if not isinstance(other, ValidationError):
+            return NotImplemented
+        return hash(self) == hash(other)
+
+    def __hash__(self):
+        # Ignore params and messages ordering.
+        if hasattr(self, 'message'):
+            return hash((
+                self.message,
+                self.code,
+                tuple(sorted(make_hashable(self.params))) if self.params else None,
+            ))
+        if hasattr(self, 'error_dict'):
+            return hash(tuple(sorted(make_hashable(self.error_dict))))
+        return hash(tuple(sorted(self.error_list, key=operator.attrgetter('message'))))
+
 
 class EmptyResultSet(Exception):
     """A database query predicate is impossible."""