Models and controllers are executed at every request therefore it is safe to change them while the app is running. Web2py handles them the way it does to allow you how replacement.
Python modules - in general - should not be replaced without turning the app off and on again. It really depends on the module and this is not a web2py specific issue. A module may define a global object and if you reload the module you end up with two of those objects. Depending on how it is used this may have unintended consequences. The fact that you technically can force python to reload a module does not mean that is good practice in general. On Tuesday, 1 May 2012 08:18:45 UTC-5, Yarin wrote: > > @Massimo- you're saying a production application should not reload > modules, but then what is the correct process for updating an app in > production - i.e. installing an app by overwriting an old one - if it has > modules that have changed? > > On Sunday, April 29, 2012 12:02:52 PM UTC-4, Massimo Di Pierro wrote: >> >> Let's clarify something.... >> >> web2py always uses the most comment models/controllers/views. >> web2py (as Python does) loads modules onces and keeps them in memory, >> even when modules are shipped with the app. >> The fact that >> >> from gluon.custom_import import track_changes; track_changes(True) >> >> overrides this behavior if a feature to be used in development, not in >> production. >> >> Reloading modules is a bad idea. It has performance penalties and can >> cause undesired effects because of global objects defined in the modules. >> A production application should not do this. >> >> >> >> On Sunday, 29 April 2012 08:34:26 UTC-5, Yarin wrote: >>> >>> Got to say this is scary- we're about to go into production with our >>> first web2py app, and having erratic module behavior persist across server >>> restarts is not something we signed up for. Please let's address this. >>> >>> On Sunday, April 29, 2012 9:12:55 AM UTC-4, Yarin wrote: >>>> >>>> @Bruno- Thanks for confirming this issue >>>> @Anthony - Thoughts? >>>> >>>> >>>>>
