Remove the use of before_first_request (#218)

Author: greyli

example/app.py

@@ -28,11 +28,6 @@ class ExampleModel(db.Model):
     value = db.Column(db.String(100), primary_key=True)
 
 
-@app.before_first_request
-def setup():
-    db.create_all()
-
-
 @app.route('/')
 def index():
     app.logger.info("Hello there")
@@ -45,3 +40,7 @@ def redirect_example():
     response = redirect(url_for('index'))
     response.set_cookie('test_cookie', '1')
     return response
+
+
+with app.app_context():
+    db.create_all()

test/basic_app.py

@@ -6,7 +6,7 @@
 app = Flask('basic_app')
 app.config['SECRET_KEY'] = 'abc123'
 app.config['SQLALCHEMY_RECORD_QUERIES'] = True
-app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////tmp/test.db'
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///:memory:'
 # This is no longer needed for Flask-SQLAlchemy 3.0+, if you're using 2.X you'll want to define this:
 # app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
 
@@ -23,12 +23,11 @@ class Foo(db.Model):
     id = db.Column(db.Integer, primary_key=True)
 
 
-@app.before_first_request
-def setup():
-    db.create_all()
-
-
 @app.route('/')
 def index():
     Foo.query.filter_by(id=1).all()
     return render_template('basic_app.html')
+
+
+with app.app_context():
+    db.create_all()