add option to use postgresql

Makefile

@@ -36,6 +36,9 @@ help:
 	@echo "  make po              -- create new po files from the source"
 	@echo "  make mo              -- create new mo files from the translated po files"
 	@echo "  make release         -- build everything required for a release"
+	@echo "  make start-postgres  -- start the local postgres cluster"
+	@echo "  make stop-postgres   -- stops the local postgres cluster"
+	@echo "  make create-postgres   -- create the local postgres cluster (only works on ubuntu 20.04)"
 	@echo
 
 .PHONY: install
@@ -146,3 +149,23 @@ release:
 	$(VIRTUAL_ENV)/bin/python3 -m pip install -r requirements.txt -q
 	$(VIRTUAL_ENV)/bin/python3 manage.py compilemessages -v0
 	$(VIRTUAL_ENV)/bin/python3 manage.py collectstatic --noinput -v0
+
+.PHONY: start-postgres
+start-postgres:
+	sudo -u postgres PGDATA=pgsql PGPORT=5556 /usr/lib/postgresql/12/bin/pg_ctl start
+
+.PHONY: stop-postgres
+stop-postgres:
+	sudo -u postgres PGDATA=pgsql PGPORT=5556 /usr/lib/postgresql/12/bin/pg_ctl stop
+
+.PHONY: create-postgres
+create-postgres:
+	if [ -d "pgsql" ]; then \
+		echo "postgresql has already been initialized"; \
+	else \
+		sudo install -d -m 744 -o postgres -g postgres pgsql; \
+		sudo -u postgres /usr/lib/postgresql/12/bin/initdb pgsql; \
+		sudo -u postgres PGDATA=pgsql PGPORT=5556 /usr/lib/postgresql/12/bin/pg_ctl start; \
+		sudo -u postgres PGDATA=pgsql PGPORT=5556 /usr/lib/postgresql/12/bin/createuser -s django; \
+		sudo -u postgres PGDATA=pgsql PGPORT=5556 /usr/lib/postgresql/12/bin/createdb -O django django; \
+	fi

README.md

@@ -32,9 +32,20 @@ adhocracy+ is designed to make online participation easy and accessible to every
     make test
 
 ### Start a local server:
-
     make watch
 
+### Use postgresql database for testing:
+run the following command once:
+```
+make create-postgres
+```
+to start the testserver with postgresql, run:
+```
+export DATABASE=postgresql
+make start-postgres
+make watch
+```
+
 Go to http://localhost:8004/ and login with admin@liqd.net | password
 
 ## Installation on a production system

adhocracy-plus/config/settings/dev.py

@@ -32,3 +32,17 @@
 BASE_URL = 'http://localhost:8004'
 CAPTCHA_URL = 'https://captcheck.netsyms.com/api.php'
 SITE_ID = 1
+
+if os.getenv("DATABASE") == "postgresql":
+    DATABASES = {
+    'default': {
+        'ENGINE': 'django.db.backends.postgresql_psycopg2',
+        'NAME': 'django',
+        'USER': 'django',
+        'PASSWORD': '',
+        'HOST': '',
+        'PORT': '5556',
+        'OPTIONS': {
+            },
+        }
+    }