[Flask] Subclassing flask.Flask?

[Gergely Polonkai]

Hello,

I don't see anything wrong with that; in fact, Python is a language where
you can do the same thing in many different ways.

I don't really see the advantages of application factories and module
globals; if you don't have a Flask instance, you can't use them anyway. If
you have a Flask instance, why would you use them instead of class
properties?

Right now I'm trying to transition a relatively big Flask app from app
factory to Flask subclass. There are a lot of measurements to do, but so
far it looks cleaner (to me).

Best,
Gergely

On Fri, Mar 31, 2017, 14:49 Skip Montanaro <skip.montanaro at gmail.com> wrote:

> I'm getting to the point with a smallish Flask application that I
> really don't want a bunch of module-level global variables sitting
> around. My initial inclination would be to subclass flask.Flask, but
> picking through the documentation and the prominent examples
> (minitwit, etc), I didn't see any examples of this. This leads me to
> believe that maybe that's not the correct route for corralling my
> data.
>
> I'll give you one small example. My database is actually constructed
> from a set of files which are updated outside of my control. I'd like
> to run a separate thread to incrementally update the relevant bits of
> my database as individual files change. The straightforward (to me)
> way to do this is to have a separate thread which keeps things
> up-to-date. As I'm currently using sqlite3, that suggests I need to
> lock access. Storing the necessary threading.{RLock,Lock} object at
> the module level seems iffy. I'd prefer to keep it as an instance
> attribute. Once I've got a subclass, why not put all the
> implementation in instance methods with the necessary @app.route
> decorators?
>
> So, am I off-base in thinking I should subclass the Flask class? Is
> there a more prevalent pattern?
>
> Thx,
>
> Skip Montanaro
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