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-rw-r--r--django/contrib/mongodb/compiler.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/django/contrib/mongodb/compiler.py b/django/contrib/mongodb/compiler.py
index c2a8c11b23..1851967ba9 100644
--- a/django/contrib/mongodb/compiler.py
+++ b/django/contrib/mongodb/compiler.py
@@ -172,6 +172,10 @@ class SQLUpdateCompiler(SQLCompiler):
vals = {}
for field, o, value in self.query.values:
+ if hasattr(value, 'prepare_database_save'):
+ value = value.prepare_database_save(field)
+ else:
+ value = field.get_db_prep_save(value, connection=self.connection)
if hasattr(value, "evaluate"):
assert value.connector in (value.ADD, value.SUB)
assert not value.negated