Update app.py

app.py

@@ -12,6 +12,11 @@ from aimakerspace.vectordatabase import VectorDatabase
 from aimakerspace.openai_utils.chatmodel import ChatOpenAI
 import chainlit as cl
 
+# Get OpenAI API key from environment variables
+openai_api_key = os.getenv("OPENAI_API_KEY")
+if not openai_api_key:
+    raise ValueError("OPENAI_API_KEY environment variable is not set")
+
 system_template = """\
 Use the following context to answer a users question. If you cannot find the answer in the context, say you don't know the answer."""
 system_role_prompt = SystemRolePrompt(system_template)
@@ -111,7 +116,8 @@ async def on_chat_start():
     vector_db = VectorDatabase()
     vector_db = await vector_db.abuild_from_list(texts)
     
-    chat_openai = ChatOpenAI()
+    # Initialize ChatOpenAI with API key from environment variable
+    chat_openai = ChatOpenAI(api_key=openai_api_key)
 
     # Create a chain
     retrieval_augmented_qa_pipeline = RetrievalAugmentedQAPipeline(