Added PostreSQL adaptor.

Dockerfile

@@ -1,28 +1,32 @@
-FROM python:3.9-alpine3.13
-LABEL maintainer="[email protected]"
-
-ENV PYTHONUNBUFFERED 1
-
-COPY ./requirements.txt /tmp/requirements.txt
-COPY ./requirements.dev.txt /tmp/requirements.dev.txt
-COPY ./app /app
-WORKDIR /app
-EXPOSE 8000
-
-ARG DEV=false
-RUN python -m venv /py && \
-    /py/bin/pip install --upgrade pip && \
-    /py/bin/pip install -r /tmp/requirements.txt && \
-    if [ $DEV = "true" ]; \
-        then /py/bin/pip install -r /tmp/requirements.dev.txt ; \
-    fi && \
-    rm -rf /tmp && \
-    adduser \
-        --disabled-password \
-        --no-create-home \
-        django-user
-
-ENV PATH="/py/bin:$PATH"
-
-USER django-user
-
+FROM python:3.9-alpine3.13
+LABEL maintainer="[email protected]"
+
+ENV PYTHONUNBUFFERED 1
+
+COPY ./requirements.txt /tmp/requirements.txt
+COPY ./requirements.dev.txt /tmp/requirements.dev.txt
+COPY ./app /app
+WORKDIR /app
+EXPOSE 8000
+
+ARG DEV=false
+RUN python -m venv /py && \
+    /py/bin/pip install --upgrade pip && \
+    apk add --update --no-cache postgresql-client && \
+    apk add --update --no-cache --virtual .tmp-build-deps \
+        build-base postgresql-dev musl-dev && \
+    /py/bin/pip install -r /tmp/requirements.txt && \
+    if [ $DEV = "true" ]; \
+        then /py/bin/pip install -r /tmp/requirements.dev.txt ; \
+    fi && \
+    rm -rf /tmp && \
+    apk del .tmp-build-deps && \
+    adduser \
+        --disabled-password \
+        --no-create-home \
+        django-user
+
+ENV PATH="/py/bin:$PATH"
+
+USER django-user
+

app/app/calc.py

@@ -0,0 +1,13 @@
+"""
+Calculator functions
+"""
+
+
+def add(x, y):
+    """ Add two numbers."""
+    return x + y
+
+
+def subtract(x, y):
+    """ Subtracting x from y """
+    return x - y

app/app/tests.py

@@ -0,0 +1,20 @@
+"""
+Sample tests
+"""
+from django.test import SimpleTestCase
+
+from . import calc
+
+
+class CalculatorTests(SimpleTestCase):
+    """ Test the calc module """
+    def test_add_numbers(self):
+        """ Test adding two numbers """
+        res = calc.add(3, 6)
+        self.assertEqual(res, 9)
+
+    def test_subtract_numbers(self):
+        """ Testing subtracting two numbers """
+        res = calc.subtract(10, 5)
+
+        self.assertEqual(res, 5)

docker-compose.yml

@@ -1,15 +1,34 @@
-version: "3.9"
-
-services:
-  app:
-    build:
-      context: .
-      args:
-        - DEV=true
-    ports:
-      - "8000:8000"
-    volumes:
-      - ./app:/app
-    command: >
-      sh -c "python manage.py runserver 0.0.0.0:8000"
-
+version: "3.9"
+
+services:
+  app:
+    build:
+      context: .
+      args:
+        - DEV=true
+    ports:
+      - "8000:8000"
+    volumes:
+      - ./app:/app
+    command: >
+      sh -c "python manage.py runserver 0.0.0.0:8000"
+    environment:
+      - DB_HOST=db
+      - DB_NAME=devdb
+      - DB_USER=devuser
+      - DB_PASS=changeme
+    depends_on:
+      - db
+
+
+  db:
+    image: postgres:13-alpine
+    volumes:
+      - dev-db-data:/var/lib/postgresql/data
+    environment:
+      - POSTGRES_DB=devdb
+      - POSTGRES_USER=devuser
+      - POSTGRES_PASSWORD=changeme
+
+volumes:
+  dev-db-data:

requirements.txt

@@ -1,2 +1,3 @@
-Django>=3.2.4,<3.3
-djangorestframework>=3.12.4,<3.13
+Django>=3.2.4,<3.3
+djangorestframework>=3.12.4,<3.13
+psycopg2>=2.8.6,<2.9