fix: image text when retrieve chat histories (#3220)

api/models/model.py

@@ -815,7 +815,7 @@ class Message(db.Model):
     @property
     def workflow_run(self):
         if self.workflow_run_id:
-            from api.models.workflow import WorkflowRun
+            from .workflow import WorkflowRun
             return db.session.query(WorkflowRun).filter(WorkflowRun.id == self.workflow_run_id).first()
 
         return None

api/models/workflow.py

@@ -299,6 +299,10 @@ class WorkflowRun(db.Model):
             Message.workflow_run_id == self.id
         ).first()
 
+    @property
+    def workflow(self):
+        return db.session.query(Workflow).filter(Workflow.id == self.workflow_id).first()
+
 
 class WorkflowNodeExecutionTriggeredFrom(Enum):
     """