chromaDB collection creation error in pdf embedding

[Aprilistic]

Hi, there!

Thank you for sharing the fastAPI tutorial.
Your code greatly helped our team in this hackathon.
However, there is a part of your code that needs improvement.

https://github.com/Ilevk/solar-backend-fastapi-advanced/blob/main/app/services/embedding.py

In app/services/embedding.py,

In lines 65-70, create_creation raises an error when you create with an existing collection name.

try:
   await client.create_collection(name=collection_name)
except Exception:
   logger.info(f"Collection {collection_name} already exists")

collection: Collection = await client.get_collection(collection_name)

Instead, we can fix the code like the following line.

collection: Collection = await client.get_or_create_collection(collection_name)