� FIX: 修复RAG系统导入问题 - 更新LangChain依赖并添加调试信息

frontend/src/pages/Playground.tsx

@@ -1418,21 +1418,27 @@ function DocumentsTab({
     if (!files) return
 
     setIsUploading(true)
+    console.log('Starting file upload process...', files.length, 'files')
     
     try {
       const formData = new FormData()
       
       for (const file of Array.from(files)) {
+        console.log('Adding file to FormData:', file.name, 'type:', file.type)
         formData.append('files', file)
       }
 
+      console.log('Making API request to /rag/upload...')
       const response = await fetch('/rag/upload', {
         method: 'POST',
         body: formData,
       })
 
+      console.log('Upload response status:', response.status)
+      
       if (response.ok) {
         const result = await response.json()
+        console.log('Upload result:', result)
         
         // Add successfully processed files to the list
         const newFiles = result.results
@@ -1447,15 +1453,19 @@ function DocumentsTab({
             chunks: r.chunks
           }))
         
+        console.log('Successfully processed files:', newFiles)
         setUploadedFiles(prev => [...prev, ...newFiles])
         
         // Show errors for failed uploads
         const failedUploads = result.results.filter((r: any) => !r.success)
         if (failedUploads.length > 0) {
           console.error('Some files failed to upload:', failedUploads)
+        } else {
+          console.log('All files uploaded successfully!')
         }
       } else {
-        console.error('Upload failed:', response.statusText)
+        const errorText = await response.text()
+        console.error('Upload failed:', response.status, response.statusText, errorText)
       }
       
       // Reset input

rag_system.py

@@ -8,17 +8,18 @@ from pathlib import Path
 import uuid
 
 try:
-    from langchain.document_loaders import (
+    from langchain_community.document_loaders import (
         PyPDFLoader,
         TextLoader,
         UnstructuredWordDocumentLoader
     )
     from langchain.text_splitter import RecursiveCharacterTextSplitter
-    from langchain.embeddings import HuggingFaceEmbeddings
-    from langchain.vectorstores import FAISS
+    from langchain_huggingface import HuggingFaceEmbeddings
+    from langchain_community.vectorstores import FAISS
     from langchain.schema import Document
-except ImportError:
-    print("LangChain not installed. Install with: pip install langchain pypdf python-docx faiss-cpu sentence-transformers")
+except ImportError as e:
+    print(f"LangChain not installed or import error: {e}")
+    print("Install with: pip install langchain langchain-community langchain-huggingface pypdf python-docx faiss-cpu sentence-transformers")
     
 class SimpleRAGSystem:
     def __init__(self):

requirements.txt

@@ -11,6 +11,7 @@ python-dotenv>=1.0.0
 # RAG System Dependencies
 langchain>=0.1.0
 langchain-community>=0.0.10
+langchain-huggingface>=0.3.0
 pypdf>=3.17.0
 python-docx>=1.1.0
 faiss-cpu>=1.7.4