djfapi

djfapi

A utility library to integrate and use fastapi with the django orm.

🚧 This project is WIP and is subject to change at any time

This project is currently in the alpha state, even though it can be used in production with some caution. Make sure to fix the version in your requirements.txt and review changes frequently.

Installation

pip install djfapi

Features

Sentry

Provides optional sentry integration.

djdantic usage

See djdantic for schema usage.

Automatic Route Generation

Declare routes without having to write routes using the djfapi.routing.django.DjangoRouterSchema.

The DjangoRouterSchema will supply a router, which just has to be included in the FastAPI app.

Example for Routes

from djfapi.routing.django import DjangoRouterSchema, SecurityScopes


transaction_token = JWTToken(scheme_name="Transaction Token")


def company_objects_filter(access: Access) -> Q:
    q = Q(tenant_id=access.tenant_id)
    if access.scope.selector != 'any':
        q &= Q(employees__user_id=access.user_id, employees__type__in=[models.Employee.EmployeeType.OWNER, models.Employee.EmployeeType.ADMIN])

    return q


router = DjangoRouterSchema(
    name='companies',
    model=models.Company,
    get=schemas.response.Company,
    create=schemas.request.CompanyCreate,
    update=schemas.request.CompanyUpdate,
    security=transaction_token,
    security_scopes=SecurityScopes(
        get=['business.companies.read.any', 'business.companies.read.own',],
        post=['business.companies.create',],
        patch=['business.companies.update.any', 'business.companies.update.own',],
        put=['business.companies.update.any', 'business.companies.update.own',],
        delete=['business.companies.delete.any', 'business.companies.delete.own',],
    ),
    objects_filter=company_objects_filter,
    children=[
        DjangoRouterSchema(
            name='departments',
            model=models.CompanyDepartment,
            get=schemas.response.CompanyDepartment,
            create=schemas.request.CompanyDepartmentCreate,
            update=schemas.request.CompanyDepartmentUpdate,
            children=[
                DjangoRouterSchema(
                    name='teams',
                    model=models.CompanyDepartmentTeam,
                    get=schemas.response.CompanyDepartmentTeam,
                    create=schemas.request.CompanyDepartmentTeamCreate,
                    update=schemas.request.CompanyDepartmentTeamUpdate,
                ),
            ]
        ),
        DjangoRouterSchema(
            name='costcenters',
            model=models.CompanyCostcenter,
            get=schemas.response.CompanyCostcenter,
            create=schemas.request.CompanyCostcenterCreate,
            update=schemas.request.CompanyCostcenterUpdate,
        ),
    ]
)

Info for using FastAPI and Django

⚠️ Database Connection Leaks

When using FastAPI with Django and performing django db operations from within a FastAPI Endpoint, required signals regarding request handling from django are not called. The Django signals django.core.signals.request_started and django.core.signals.request_finished need to be called prior and after every request (which uses the django orm in it's endpoint), otherwise database connections are leaked undefinedly. Those signals must be called from the same thread, in which the orm is used.

There is a method decorator provided by djfapi in djfapi.utils.fastapi_django.request_signalling, which can be applied to any (sync) endpoints. For autogenerated endpoints or manual endpoints decorated with a DjangoRouterSchema.endpoint, this is already done.