Remove databases package from config docs

docs/config.md

@@ -7,8 +7,7 @@ that is not committed to source control.
 **app.py**:
 
 ```python
-import databases
-
+from sqlalchemy import create_engine
 from starlette.applications import Starlette
 from starlette.config import Config
 from starlette.datastructures import CommaSeparatedStrings, Secret
@@ -17,11 +16,12 @@ from starlette.datastructures import CommaSeparatedStrings, Secret
 config = Config(".env")
 
 DEBUG = config('DEBUG', cast=bool, default=False)
-DATABASE_URL = config('DATABASE_URL', cast=databases.DatabaseURL)
+DATABASE_URL = config('DATABASE_URL')
 SECRET_KEY = config('SECRET_KEY', cast=Secret)
 ALLOWED_HOSTS = config('ALLOWED_HOSTS', cast=CommaSeparatedStrings)
 
 app = Starlette(debug=DEBUG)
+engine = create_engine(DATABASE_URL)
 ...
 ```
 
@@ -31,7 +31,7 @@ app = Starlette(debug=DEBUG)
 # Don't commit this to source control.
 # Eg. Include ".env" in your `.gitignore` file.
 DEBUG=True
-DATABASE_URL=postgresql://localhost/myproject
+DATABASE_URL=postgresql://user:password@localhost:5432/database
 SECRET_KEY=43n080musdfjt54t-09sdgr
 ALLOWED_HOSTS=127.0.0.1, localhost
 ```
@@ -69,9 +69,7 @@ in their representations.
 ```python
 >>> from myproject import settings
 >>> settings.DATABASE_URL
-DatabaseURL('postgresql://admin:**********@192.168.0.8/my-application')
->>> str(settings.DATABASE_URL)
-'postgresql://admin:[email protected]/my-application'
+'postgresql://user:password@localhost:5432/database'
 ```
 
 ## CommaSeparatedStrings
@@ -119,6 +117,7 @@ You can namespace the environment variables by setting `env_prefix` argument.
 
 ```python title="myproject/settings.py"
 import os
+
 from starlette.config import Config
 
 os.environ['APP_DEBUG'] = 'yes'
@@ -145,7 +144,6 @@ application logic separated:
 **myproject/settings.py**:
 
 ```python
-import databases
 from starlette.config import Config
 from starlette.datastructures import Secret
 
@@ -155,9 +153,7 @@ DEBUG = config('DEBUG', cast=bool, default=False)
 TESTING = config('TESTING', cast=bool, default=False)
 SECRET_KEY = config('SECRET_KEY', cast=Secret)
 
-DATABASE_URL = config('DATABASE_URL', cast=databases.DatabaseURL)
-if TESTING:
-    DATABASE_URL = DATABASE_URL.replace(database='test_' + DATABASE_URL.database)
+DATABASE_URL = config('DATABASE_URL')
 ```
 
 **myproject/tables.py**:
@@ -180,6 +176,7 @@ from starlette.applications import Starlette
 from starlette.middleware import Middleware
 from starlette.middleware.sessions import SessionMiddleware
 from starlette.routing import Route
+
 from myproject import settings
 
 
@@ -225,13 +222,14 @@ def setup_test_database():
     """
     Create a clean test database every time the tests are run.
     """
-    url = str(settings.DATABASE_URL)
-    engine = create_engine(url)
-    assert not database_exists(url), 'Test database already exists. Aborting tests.'
-    create_database(url)             # Create the test database.
-    metadata.create_all(engine)      # Create the tables.
-    yield                            # Run the tests.
-    drop_database(url)               # Drop the test database.
+    engine = create_engine(settings.DATABASE_URL)
+    assert not database_exists(settings.DATABASE_URL), 'Test database already exists. Aborting tests.'
+    create_database(settings.DATABASE_URL)  # Create the test database.
+    metadata.create_all(engine)  # Create the tables.
+
+    yield  # Run the tests.
+
+    drop_database(settings.DATABASE_URL)  # Drop the test database.
 
 
 @pytest.fixture()