Database models for Firestore using Pydantic base models.
The package is available on PyPI:
pip install firedantic
In your application you will need to configure the firestore db client and optionally the collection prefix, which by default is empty.
from os import environ
from unittest.mock import Mock
import google.auth.credentials
from firedantic import configure
from google.cloud.firestore import Client
# Firestore emulator must be running if using locally.
if environ.get("FIRESTORE_EMULATOR_HOST"):
client = Client(
project="firedantic-test",
credentials=Mock(spec=google.auth.credentials.Credentials)
)
else:
client = Client()
configure(client, prefix="firedantic-test-")
Once that is done, you can start defining your Pydantic models, e.g:
from pydantic import BaseModel
from firedantic import Model
class Owner(BaseModel):
"""Dummy owner Pydantic model."""
first_name: str
last_name: str
class Company(Model):
"""Dummy company Firedantic model."""
__collection__ = "companies"
company_id: str
owner: Owner
# Now you can use the model to save it to Firestore
owner = Owner(first_name="John", last_name="Doe")
company = Company(company_id="1234567-8", owner=owner)
company.save()
# Prints out the firestore ID of the Company model
print(company.id)
# Reloads model data from the database
company.reload()
Querying is done via a MongoDB-like find():
from firedantic import Model
import firedantic.operators as op
from google.cloud.firestore import Query
class Product(Model):
__collection__ = "products"
product_id: str
stock: int
unit_value: int
Product.find({"product_id": "abc-123"})
Product.find({"stock": {">=": 3}})
# or
Product.find({"stock": {op.GTE: 3}})
Product.find({"stock": {">=": 1}}, order_by=[('unit_value', Query.ASCENDING)], limit=25, offset=50)
Product.find(order_by=[('unit_value', Query.ASCENDING), ('stock', Query.DESCENDING)], limit=2)
The query operators are found at https://firebase.google.com/docs/firestore/query-data/queries#query_operators.
Firedantic can also be used in an async way, like this:
import asyncio
from os import environ
from unittest.mock import Mock
import google.auth.credentials
from google.cloud.firestore import AsyncClient
from firedantic import AsyncModel, configure
# Firestore emulator must be running if using locally.
if environ.get("FIRESTORE_EMULATOR_HOST"):
client = AsyncClient(
project="firedantic-test",
credentials=Mock(spec=google.auth.credentials.Credentials),
)
else:
client = AsyncClient()
configure(client, prefix="firedantic-test-")
class Person(AsyncModel):
__collection__ = "persons"
name: str
async def main():
alice = Person(name="Alice")
await alice.save()
print(f"Saved Alice as {alice.id}")
bob = Person(name="Bob")
await bob.save()
print(f"Saved Bob as {bob.id}")
found_alice = await Person.find_one({"name": "Alice"})
print(f"Found Alice: {found_alice.id}")
assert alice.id == found_alice.id
found_bob = await Person.get_by_id(bob.id)
assert bob.id == found_bob.id
print(f"Found Bob: {found_bob.id}")
await alice.delete()
print("Deleted Alice")
await bob.delete()
print("Deleted Bob")
if __name__ == "__main__":
asyncio.run(main())
Subcollections in Firestore are basically dynamically named collections.
Firedantic supports them via the SubCollection and SubModel classes, by creating
dynamic classes with collection name determined based on the "parent" class it is in
reference to using the model_for() method.
from typing import Optional, Type
from firedantic import AsyncModel, AsyncSubCollection, AsyncSubModel, ModelNotFoundError
class UserStats(AsyncSubModel):
id: Optional[str] = None
purchases: int = 0
class Collection(AsyncSubCollection):
# Can use any properties of the "parent" model
__collection_tpl__ = "users/{id}/stats"
class User(AsyncModel):
__collection__ = "users"
name: str
async def get_user_purchases(user_id: str, period: str = "2021") -> int:
user = await User.get_by_id(user_id)
stats_model: Type[UserStats] = UserStats.model_for(user)
try:
stats = await stats_model.get_by_id(period)
except ModelNotFoundError:
stats = stats_model()
return stats.purchases
Firedantic has support for defining composite indexes and TTL policies as well as creating them.
Composite indexes of a collection are defined in __composite_indexes__, which is a
list of all indexes to be created.
To define an index, you can use collection_index or collection_group_index,
depending on the query scope of the index. Each of these takes in an arbitrary amount of
tuples, where the first element is the field name and the second is the order
(ASCENDING/DESCENDING).
The set_up_composite_indexes and async_set_up_composite_indexes functions are used
to create indexes.
For more details, see the example further down.
The field used for the TTL policy should be a datetime field and the name of the field
should be defined in __ttl_field__. The set_up_ttl_policies and
async_set_up_ttl_policies functions are used to set up the policies.
Note: The TTL policies can not be set up in the Firestore emulator.
Below are examples (both sync and async) to show how to use Firedantic to set up composite indexes and TTL policies.
The examples use async_set_up_composite_indexes_and_ttl_policies and
set_up_composite_indexes_and_ttl_policies functions to set up both composite indexes
and TTL policies. However, you can use separate functions to set up only either one of
them.
from datetime import datetime
from firedantic import (
collection_index,
collection_group_index,
configure,
get_all_subclasses,
Model,
set_up_composite_indexes_and_ttl_policies,
)
from google.cloud.firestore import Client, Query
from google.cloud.firestore_admin_v1 import FirestoreAdminClient
class ExpiringModel(Model):
__collection__ = "expiringModel"
__ttl_field__ = "expire"
__composite_indexes__ = [
collection_index(("content", Query.ASCENDING), ("expire", Query.DESCENDING)),
collection_group_index(("content", Query.DESCENDING), ("expire", Query.ASCENDING)),
]
expire: datetime
content: str
def main():
configure(Client(), prefix="firedantic-test-")
set_up_composite_indexes_and_ttl_policies(
gcloud_project="my-project",
models=get_all_subclasses(Model),
client=FirestoreAdminClient(),
)
# or use set_up_composite_indexes / set_up_ttl_policies functions separately
if __name__ == "__main__":
main()
import asyncio
from datetime import datetime
from firedantic import (
AsyncModel,
async_set_up_composite_indexes_and_ttl_policies,
collection_index,
collection_group_index,
configure,
get_all_subclasses,
)
from google.cloud.firestore import AsyncClient, Query
from google.cloud.firestore_admin_v1.services.firestore_admin import (
FirestoreAdminAsyncClient,
)
class ExpiringModel(AsyncModel):
__collection__ = "expiringModel"
__ttl_field__ = "expire"
__composite_indexes__ = [
collection_index(("content", Query.ASCENDING), ("expire", Query.DESCENDING)),
collection_group_index(("content", Query.DESCENDING), ("expire", Query.ASCENDING)),
]
expire: datetime
content: str
async def main():
configure(AsyncClient(), prefix="firedantic-test-")
await async_set_up_composite_indexes_and_ttl_policies(
gcloud_project="my-project",
models=get_all_subclasses(AsyncModel),
client=FirestoreAdminAsyncClient(),
)
# or await async_set_up_composite_indexes / async_set_up_ttl_policies separately
if __name__ == "__main__":
asyncio.run(main())
PRs are welcome!
To run tests locally, you should run:
poetry install
poetry run invoke test
To run the Firestore emulator locally you will need:
To install the firebase CLI run:
npm install -g firebase-tools
Run the Firestore emulator with a predictable port:
./start_emulator.sh
# or on Windows run the .bat file
start_emulator
Although this library provides both sync and async versions of models, please keep in mind that you need to explicitly maintain only async version of it. The synchronous version is generated automatically by invoke task:
poetry run invoke unasync
We decided to go this way in order to:
Thus, please make sure you don't modify any of files under
firedantic/_sync and
firedantic/tests/tests_sync by hands. unasync is also
running as part of pre-commit hooks, but in order to run the latest version of tests you
have to run it manually.
After you have increased the version number in pyproject.toml, please run the following command to generate a changelog placeholder and fill in the relevant information about the release in CHANGELOG.md:
poetry run invoke make-changelog
This code is released under the BSD 3-Clause license. Details in the LICENSE file.
FAQs
Pydantic base models for Firestore
We found that firedantic demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 3 open source maintainers collaborating on the project.
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