update knowledge base db orm:

1. set default values for file_count, file_version, create_time.
2. fix bug: add_doc_to_db
3. make add_kb_to_db more flexiable with existing kb

server/db/models/knowledge_base_model.py

@@ -1,6 +1,6 @@
 from sqlalchemy import Column, Integer, String, DateTime
-
 from server.db.base import Base
+from datetime import datetime
 
 
 class KnowledgeBaseModel(Base):
@@ -12,8 +12,8 @@ class KnowledgeBaseModel(Base):
     kb_name = Column(String, comment='知识库名称')
     vs_type = Column(String, comment='嵌入模型类型')
     embed_model = Column(String, comment='嵌入模型名称')
-    file_count = Column(Integer, comment='文件数量')
-    create_time = Column(DateTime, comment='创建时间')
+    file_count = Column(Integer, comment='文件数量', default=0)
+    create_time = Column(DateTime, comment='创建时间', default=datetime.now)
 
     def __repr__(self):
         return f"<KnowledgeBase(id='{self.id}', kb_name='{self.kb_name}', vs_type='{self.vs_type}', embed_model='{self.embed_model}', file_count='{self.file_count}', create_time='{self.create_time}')>"

server/db/models/knowledge_file_model.py

@@ -1,7 +1,6 @@
 from sqlalchemy import Column, Integer, String, DateTime
-
 from server.db.base import Base
-
+from datetime import datetime
 
 class KnowledgeFileModel(Base):
     """
@@ -14,8 +13,8 @@ class KnowledgeFileModel(Base):
     kb_name = Column(String, comment='所属知识库名称')
     document_loader_name = Column(String, comment='文档加载器名称')
     text_splitter_name = Column(String, comment='文本分割器名称')
-    file_version = Column(Integer, comment='文件版本')
-    create_time = Column(DateTime, comment='创建时间')
+    file_version = Column(Integer, comment='文件版本', default=1)
+    create_time = Column(DateTime, comment='创建时间', default=datetime.now)
 
     def __repr__(self):
         return f"<KnowledgeFile(id='{self.id}', file_name='{self.file_name}', file_ext='{self.file_ext}', kb_name='{self.kb_name}', document_loader_name='{self.document_loader_name}', text_splitter_name='{self.text_splitter_name}', file_version='{self.file_version}', create_time='{self.create_time}')>"

server/db/repository/knowledge_base_repository.py

@@ -5,8 +5,10 @@ from server.db.session import with_session
 @with_session
 def add_kb_to_db(session, kb_name, vs_type, embed_model):
     # 创建知识库实例
-    kb = KnowledgeBaseModel(kb_name=kb_name, vs_type=vs_type, embed_model=embed_model)
-    session.add(kb)
+    kb = session.query(KnowledgeBaseModel).filter_by(kb_name=kb_name).first()
+    if not kb:
+        kb = KnowledgeBaseModel(kb_name=kb_name, vs_type=vs_type, embed_model=embed_model)
+        session.add(kb)
     return True
 
 

server/db/repository/knowledge_file_repository.py

@@ -20,10 +20,19 @@ def add_doc_to_db(session, kb_file: KnowledgeFile):
                                                                     kb_name=kb_file.kb_name).first()
         if existing_file:
             existing_file.file_version += 1
+            session.add(existing_file)
         # 否则，添加新文件
         else:
-            session.add(kb_file)
+            new_file = KnowledgeFileModel(
+                file_name=kb_file.filename,
+                file_ext=kb_file.ext,
+                kb_name=kb_file.kb_name,
+                document_loader_name=kb_file.document_loader_name,
+                text_splitter_name=kb_file.text_splitter_name,
+            )
             kb.file_count += 1
+            session.add(new_file)
+            session.add(kb)
     return True
 
 

server/knowledge_base/kb_doc_api.py

@@ -8,7 +8,6 @@ import json
 from server.knowledge_base.utils import KnowledgeFile, list_docs_from_folder
 from server.knowledge_base.kb_service.base import KBServiceFactory
 from server.knowledge_base.kb_service.base import SupportedVSType
-from server.knowledge_base.kb_service.faiss_kb_service import refresh_vs_cache
 from typing import Union
 
 
@@ -81,7 +80,6 @@ async def delete_doc(knowledge_base_name: str,
 
 async def update_doc():
     # TODO: 替换文件
-    # refresh_vs_cache(knowledge_base_name)
     pass
 
 
@@ -109,6 +107,7 @@ async def recreate_vector_store(
             return BaseResponse(code=404, msg=f"未找到知识库 {knowledge_base_name}")
 
     async def output(kb):
+        kb.create_kb()
         kb.clear_vs()
         print(f"start to recreate vector store of {kb.kb_name}")
         docs = list_docs_from_folder(knowledge_base_name)
@@ -126,7 +125,5 @@ async def recreate_vector_store(
                 kb.add_doc(kb_file)
             except ValueError as e:
                 print(e)
-        if kb.vs_type == SupportedVSType.FAISS:
-            refresh_vs_cache(knowledge_base_name)
 
     return StreamingResponse(output(kb), media_type="text/event-stream")