How can I get Django inside a docker compose network to recognize the postgres service name while using PyCharm?

I've been fiddling with my Dockerfile and Docker Compose to try and get PyCharm to be able to run and debug my django application. I've identified that I need all services to be on the same network, and have put them on the same network, but when I go to execute the runserver command through my PyCharm configuration, I get an error that django.db.utils.OperationalError: could not translate host name "postgres" to address: Name or service not known

I've tried adjusting the Dockerfile to expose environment variables inside of it, instead of in the compose file. As well as grouping all the services into the same network. I'm at a bit of a loss as to where to go from here, as most other StackOverflow questions relating to this tell me to do things I've already tried.

docker-compose.yml

version: "2"
services:
    redis:
        image: redis:latest # redis
        restart: always
        logging:
            driver: "none"
        networks:
            - integration

    postgres:
        image: postgres:latest
        restart: always
        ports:
            - "5400:5399"
        volumes:
            - /usr/lib/postgresql
            - ./tmp:/dmp:ro
            - ./load.sh:/usr/app/load.sh
        environment:
            POSTGRES_USER: vagrant
            POSTGRES_PASSWORD: vagrant
            POSTGRES_HOST_AUTH_METHOD: trust
        logging:
            driver: none
        networks:
            - integration

    django:
        build: .
        command: "/bin/bash"
        working_dir: /usr/app/
        stdin_open: true
        tty: true
        volumes:
            - ./tmp:/tmp
            - ./:/usr/app
            - ~/.ssh:/root/.ssh:ro
        links:
            - redis:redis
            - postgres:postgres
        depends_on:
            - postgres
        environment:
            DJANGO_SETTINGS_MODULE: project.settings.docker_local
            DJANGO_DEBUG: "true"
            SSH_AUTH_SOCK: /tmp/authsock
        logging:
            driver: none
        networks:
            - integration

networks:
    integration:
        driver: bridge

Dockerfile

FROM python:latest
RUN echo "installing requirements"
COPY requirements/ /usr/app/reqs/
RUN pip install -r /usr/app/reqs/base.txt
RUN pip install -r /usr/app/reqs/local.txt
ENV DJANGO_SETTINGS_MODULE=project.settings.docker_local
COPY . /usr/app/
RUN echo "done"

I have hooked up PyCharm with the remote interpreter living inside the django service, and it is able to recognize all of the installed packages.

I have a docker-compose configuration for building the containers within PyCharm, and a Django Server configuration for running the runserver command on the Django service.

Docker-Compose Config:

Django-Server Config:

Finally, here is the relevant portion of my settings file, docker_local.py

DATABASES = {
    'default': dj_database_url.config(
        default='postgres://vagrant:vagrant@postgres/vagrant'),
}
DATABASES['default']['ENGINE'] = 'django.contrib.gis.db.backends.postgis'

Any and all help or advice is greatly appreciated.