Unable to install Django package in a Docker container

Question

I'm trying to install a simple Django package in a Docker container.

Here is my dockerfile

FROM python:3.8
ENV PYTHONDONTWRITEBYTECODE 1 
ENV PYTHONUNBUFFERED 1
WORKDIR /app
COPY Pipfile Pipfile.lock /app/ 
RUN pip install pipenv && pipenv install --system
COPY . /app/

And here is my docker-compose:

version: '3.7'
services:
  web:
    build: .
    command: python /app/manage.py runserver 0.0.0.0:8000
    volumes:
      - .:/app 
    ports:
      - 8000:8000
    depends_on:
      - db
  db:
    image: postgres:11
    volumes:
      - /Users/ruslaniv/Documents/Docker/djangoapp:/var/lib/postgresql/data/
    environment:
      - POSTGRES_USER=XXX
      - POSTGRES_PASSWORD=XXX
      - POSTGRES_DB=djangoapp
volumes:
  djangoapp:

So, I start my container with

docker-compose up

then install a package and rebuild an image

docker-compose exec web pipenv install django-crispy-forms
docker-compose down
docker-compose up -d --build

Then I add 'crispy_forms' into local settings.py and register crispy forms tags in a local html file with {% load crispy_forms_tags %} and then use them for the form with {{ form|crispy }}

But the form is not rendered properly.
Since the package itself and its usage are very simple I think there is a problem with installing the package in a container.

So the question is how to properly install a Django package in a Docker container and am I doing it properly?

Answer 1

Although the question was about installing Django packages in a Docker container, the solution was much simpler.

The two facts I should have paid closer attention to:

1. After installing django-crispy-forms inside a container, I could see appropriate entries appearing in local Pipfile and Pipfile.lock (hat tip to @MichalKrejčí)
2. After rebuilding the image and running it, Django server was NOT crashing with ModuleNotFoundError: No module named 'crispy_forms'

All that meant that the package was installed successfully and there was something else going on.

Which was the fact that I had to manually include Bootstrap4 CSS files for crispy-forms to render forms according to a Bootstrap4 template.