将flask改成fastapi

api/db/services/user_canvas_version.py

@@ -0,0 +1,63 @@
+from api.db.db_models import UserCanvasVersion, DB
+from api.db.services.common_service import CommonService
+from peewee import DoesNotExist
+
+class UserCanvasVersionService(CommonService):
+    model = UserCanvasVersion
+    
+    
+    @classmethod
+    @DB.connection_context()
+    def list_by_canvas_id(cls, user_canvas_id):
+        try:
+            user_canvas_version = cls.model.select(
+                *[cls.model.id, 
+                cls.model.create_time,
+                cls.model.title,
+                cls.model.create_date, 
+                cls.model.update_date,
+                cls.model.user_canvas_id, 
+                cls.model.update_time]
+            ).where(cls.model.user_canvas_id == user_canvas_id)
+            return user_canvas_version
+        except DoesNotExist:
+            return None
+        except Exception:
+            return None
+
+    @classmethod
+    @DB.connection_context()
+    def get_all_canvas_version_by_canvas_ids(cls, canvas_ids):
+        fields = [cls.model.id]
+        versions = cls.model.select(*fields).where(cls.model.user_canvas_id.in_(canvas_ids))
+        versions.order_by(cls.model.create_time.asc())
+        offset, limit = 0, 100
+        res = []
+        while True:
+            version_batch = versions.offset(offset).limit(limit)
+            _temp = list(version_batch.dicts())
+            if not _temp:
+                break
+            res.extend(_temp)
+            offset += limit
+        return res
+
+    @classmethod
+    @DB.connection_context()
+    def delete_all_versions(cls, user_canvas_id):
+        try:
+            user_canvas_version = cls.model.select().where(cls.model.user_canvas_id == user_canvas_id).order_by(cls.model.create_time.desc())
+            if user_canvas_version.count() > 20:
+                delete_ids = []
+                for i in range(20, user_canvas_version.count()):
+                    delete_ids.append(user_canvas_version[i].id)
+                
+                cls.delete_by_ids(delete_ids)
+            return True
+        except DoesNotExist:
+            return None
+        except Exception:
+            return None
+
+
+