fastastra 0.1.38

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fastastra

fastastra is modeled after fastlite and it allows you to use FastHTML with AstraDB (Cassandra).

Installation

poetry add fastastra

or

pip install fastastra

To connect:

from fastastra.fastastra import AstraDatabase
db = AstraDatabase(token, dbid) # get your token and dbid from https://astra.datastax.com

Basic usage

List tables

db.t

Create a table

cats = db.t.cats
if cats not in db.t:
    cats.create(cat_id=uuid.uuid1, name=str, partition_keys='cat_id')

Insert a row

cat_timeuuid = uuid.uuid1()
cats.update(cat_id=cat_timeuuid, name="fluffy")

List all rows

rows = cats()

ANN / vector search

db = AstraDatabase(token, dbid, embedding_model="embed-english-v3.0") # supports all embedding models in LiteLLM using env vars
dogs = db.t.dogs
if dogs not in db.t:
    #dogs.create(id=int, name=str, good_boy=bool, embedding=(list[float], 2), pk='id') # specify dimensions in create
    dogs.create(id=int, name=str, good_boy=bool, embedding=list[float], pk='id') # infer dimensions from db.embedding_model
    dogs.c.good_boy.index()
    dogs.c.embedding.index()

dogs.insert(id=2, good_boy=True, name="spike", embedding=[0.1, 0.2])

index_lookukp = dogs.xtra(good_boy=True)
ann_matches = dogs.xtra(embedding=[0.2, 0.2])

Get dataclass and pydantic model

dataclass = cats.dataclass()
model = cats.pydantic_model()

Get a row

print(cats[cat_timeuuid])

Delete a row

cats.delete(cat_timeuuid)

or

cats.delete(str(cat_timeuuid))

Run a FastHTML example:

This example was taken almost verbatim from the FastHTML examples repo. The only change was the dependency, the db connection string, and changing the id from int to uuid1.

uv sync

uv run python examples/todo.py