when i use docker-compose to install a fastapi project, i got AssertionError:

Question

when I use docker-compose to install a fastapi project, I got AssertionError: jinja2 must be installed to use Jinja2Templates

but when I use env to install it, that will be run well.

my OS:

Ubuntu18.04STL

my requirements.txt:

fastapi~=0.68.2
starlette==0.14.2
pydantic~=1.8.1

uvicorn~=0.12.3
SQLAlchemy~=1.4.23

# WSGI
Werkzeug==1.0.1

pyjwt~=1.7.0

# async-exit-stack~=1.0.1
# async-generator~=1.10

jinja2~=2.11.2

# assert aiofiles is not None, "'aiofiles' must be installed to use FileResponse"
aiofiles~=0.6.0
python-multipart~=0.0.5

requests~=2.25.0
pyyaml~=5.3.1
# html-builder==0.0.6
loguru~=0.5.3
apscheduler==3.7.0

pytest~=6.1.2
html2text==2020.1.16
mkdocs==1.2.1

Dockerfile

FROM python:3.8
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1

WORKDIR /server
COPY requirements.txt /server/
RUN pip install -r requirements.txt
COPY . /server/

docker-compose.yml

version: '3.7'

services:
  figbox_api:
    build:
        context: .
        dockerfile: Dockerfile
    command:  uvicorn app.main:app --port 8773 --host 0.0.0.0 --reload
    volumes:
    - .:/server
    ports:
    - 8773:8773

Do I need to provide some other information?

Thanks

Answer 1

I had a same problem on heroku, the error comes from Jinja2 version 2.11.x and it run locally but not in Heroku.

Just install latest version of jinja2 it will work fine in your case too.

pip install Jinja2==3.1.2
or 
pip install Jinja2 --upgrade

Answer 2

Have had same issue, using Jinja2 (without version annotation) solved it.