Fix: second round value removal. (#9756)

### What problem does this PR solve?

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

agent/canvas.py

@@ -208,6 +208,8 @@ class Canvas:
         self.message_id = get_uuid()
         created_at = int(time.time())
         self.add_user_input(kwargs.get("query"))
+        for k, cpn in self.components.items():
+            self.components[k]["obj"].reset(True)
 
         for k in kwargs.keys():
             if k in ["query", "user_id", "files"] and kwargs[k]:

agent/component/base.py

@@ -448,9 +448,11 @@ class ComponentBase(ABC):
     def error(self):
         return self._param.outputs.get("_ERROR", {}).get("value")
 
-    def reset(self):
+    def reset(self, only_output=False):
         for k in self._param.outputs.keys():
             self._param.outputs[k]["value"] = None
+        if only_output:
+            return
         for k in self._param.inputs.keys():
             self._param.inputs[k]["value"] = None
         self._param.debug_inputs = {}

api/db/db_models.py

@@ -824,9 +824,8 @@ class UserCanvas(DataBaseModel):
 class CanvasTemplate(DataBaseModel):
     id = CharField(max_length=32, primary_key=True)
     avatar = TextField(null=True, help_text="avatar base64 string")
-    title = CharField(max_length=255, null=True, help_text="Canvas title")
-
-    description = TextField(null=True, help_text="Canvas description")
+    title = JSONField(null=True, default=dict, help_text="Canvas title")
+    description = JSONField(null=True, default=dict, help_text="Canvas description")
     canvas_type = CharField(max_length=32, null=True, help_text="Canvas type", index=True)
     dsl = JSONField(null=True, default={})
 
@@ -1021,4 +1020,13 @@ def migrate_db():
         migrate(migrator.add_column("dialog", "meta_data_filter", JSONField(null=True, default={})))
     except Exception:
         pass
+
+    try:
+        migrate(migrator.alter_column_type("canvas_template", "title", JSONField(null=True, default=dict, help_text="Canvas title")))
+    except Exception:
+        pass
+    try:
+        migrate(migrator.alter_column_type("canvas_template", "description", JSONField(null=True, default=dict, help_text="Canvas description")))
+    except Exception:
+        pass
     logging.disable(logging.NOTSET)