fix: File upload is missing hash value

Author: shaohuzhang1

apps/knowledge/models/knowledge.py

@@ -346,7 +346,7 @@ def save(self, bytea=None, force_insert=False, force_update=False, using=None, u
             raise ValueError("bytea参数不能为空")
 
         sha256_hash = get_sha256_hash(bytea)
-
+        self.sha256_hash = sha256_hash
         existing_file = QuerySet(File).filter(sha256_hash=sha256_hash).first()
         if existing_file:
             self.loid = existing_file.loid