Request to add a callback hook while registering blueprint.

[tonyseek]

Should it send a signal while register_blueprint been calling? Sometime we may expect to initialize something while a new blueprint been loading.

[apiguy]

+1 for this. Would be very helpful for extensions. @tonyseek is there a pull request incoming?

[untitaker]

Is #695 sufficient?

[mitsuhiko]

Not sure how that is useful? Wouldn't that run into bootstrapping issues as blueprints can only be registered as the application is instanciated? In that case I would assume the better approach is to just subclass Flask and customize the register method?

[untitaker]

Can anybody post some concrete examples where this hook might be useful, so @mitsuhiko is convinced?

[rcrowell]

I would like to decorate all of a blueprint's view functions with a custom @as_json function before registering the blueprint, without having to write @as_json on each one individually.

I was hoping to get a callback during blueprint-registration time to make these changes. Is there a better way?

[igarcez]

I would like to add db related initialization (creating indexes) in the blueprint registration callback