This is a fork of original `Flask-Classy` for continuing its development since the original project was not updated for a long time. For more information, see: https://github.com/apiguy/flask-classy/issues/80
Flask-Classful is an extension that adds class-based views to Flask. But why?
You're right. Blueprints are pretty awesome. But I found that they aren't always enough to encapsulate a specific context the way I need. What I wanted, no what I needed was to be able to group my views into relevant classes each with their own context and behavior. It's also made testing really nifty too.
"OK, I see your point. But can't I just use the base classes in
flask.views to do that?"
Well, yes and no. While
provide some of the functionality of
it doesn't quite complete the picture by supporting methods that
aren't part of the typical CRUD operations for a given resource, or
make it easy for me to override the route rules for particular view.
flask.views.View does add some context, it requires
a class for each view instead of letting me group very similar
views for the same resource into a single class.
"But my projects aren't that big. Can Flask-Classful do anything else for me besides making a big project easier to manage?"
Why yes. It does help a bit with some other things.
For example, Flask-Classful will automatically generate routes based on the methods in your views, and makes it super simple to override those routes using Flask's familiar decorator syntax.
Install the latest extension with:
$ pip install flask-classful
Or install the bleeding edge development version with:
$ pip install git+https://github.com/teracyhq/flask-classful.git@develop#egg=flask-classful
Let's see how it works
If you're like me, you probably get a better idea of how to use something when you see it being used. Let's go ahead and create a little app to see how Flask-Classful works:
from flask import Flask from flask_classful import FlaskView # we'll make a list to hold some quotes for our app quotes = [ "A noble spirit embiggens the smallest man! ~ Jebediah Springfield", "If there is a way to do it better... find it. ~ Thomas Edison", "No one knows what he can do till he tries. ~ Publilius Syrus" ] app = Flask(__name__) class QuotesView(FlaskView): def index(self): return "<br>".join(quotes) QuotesView.register(app) if __name__ == '__main__': app.run()
Run this app and open your web browser to: http://localhost:5000/quotes/
As you can see, it returns the list of quotes. But what if we just wanted one quote? What would we do then?
class QuotesView(FlaskView): def index(self): ... def get(self, id): id = int(id) if id < len(quotes): return quotes[id] else: return "Not Found", 404
Now direct your browser to: http://localhost:5000/quotes/1/ and you should see the very poignant quote from the esteemed Mr. Edison.
That's cool and all, but what if we just wanted a random quote? What then? Let's add a random view to our FlaskView:
from random import choice
class QuotesView(FlaskView): def index(self): ... def get(self, id): ... def random(self): return choice(quotes)
And point your browser to: http://localhost:5000/quotes/random/ and see that a random quote is returned each time. Voilà!
So by now you must be keenly aware of the fact that you have not defined a single route, but yet routing is obviously taking place. "Is this voodoo?" you ask?
Not at all. Flask-Classful will automatically create routes for any method in a FlaskView that doesn't begin with an underscore character. You can still define your own routes of course, and we'll look at that next.
Feel free to ping me on twitter @teracyhq, or head on over to the github repo at http://github.com/teracyhq/flask-classful so you can join the fun.
How to develop
Follow the dev-setup/README.md file (https://github.com/teracyhq/flask-classful/blob/develop/dev-setup/README.md)
Copyright (c) 2012 by Freedom Dumlao. Some rights reserved. Redistribution and use in source and binary forms of the software as well as documentation, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * The names of the contributors may not be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE AND DOCUMENTATION IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE AND DOCUMENTATION, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.