Thanks Massimo, now I understand! Your suggestion worked for me. Dan
On Jul 12, 11:48 pm, mdipierro <[email protected]> wrote: > Yes and no. > > the mechanism of importing modules (in python and in any other > language) allows to get stuff out of the module (functions, variables) > but not in the module (request, response, cache, etc). So you have to > pass them. You do not want to pass them to every function so here is > the suggested trick: > > #in module mymodule.py > class MyModule: > def __init__(self,request,response,session,cache,T,db): > > (self.request,self.response,self.session,self.cache,self.T,self.db)= > (request,response,session,cache,T,db) > def my_function(self,a): > # use self.request, self.response, etc. etc as needed > return a > > #in models of controllers > > mymodule=MyModule(request,response,session,cache,T,db) > print mymodule.my_function('4') > > I know this is somewhat ugly but there is no other way that I know of. > > On Jul 13, 1:12 am, Dan <[email protected]> wrote: > > > Maybe I'm doing something silly... > > > I intend to run my code on GAE when I deploy it. For development and > > testing, I use SQLite to work out most of the bugs and then I test on > > GAE to find any GAE-specific bugs/issues. So I have some conditional > > import statements in the web2py controller files, which detect when > > the code is running on GAE and import two special GAE modules so that > > my code will work properly. These are the lines that are at the top of > > my controller, and they work properly for me: > > > # for caching datastore requests > > if request.env.web2py_runtime_gae: # if running on Google App Engine > > from gluon.contrib.gae_memcache import MemcacheClient > > cache.ram=cache.disk=MemcacheClient(request) > > #else: # we will use the normal web2py caching method's cache.ram > > > # for task queue support. we use this for offline processing for > > insertion and aggregation > > if request.env.web2py_runtime_gae: # if running on Google App Engine > > from google.appengine.api.labs import taskqueue > > import urllib > > > However, my code is getting more complex and I have some routines that > > access the datastore that I would like to use in a few different > > controller files. So I would like to put the re-usable code into a > > custom module and then import that module into the controller files. > > The problem I'm running into is that I'm getting errors when using > > these conditional import statements at the top of my custom module, > > because the request object is not defined. Do I need to put the import > > statements INSIDE each function in my custom module, and pass the > > request object to each function? Or is there a better way? > > > Maybe this is an easier way to ask this question: Is it possible to > > use "@cache" function decorators in a custom module - in both the > > typical web2py (running on SQLite) and GAE environments? If so, how > > would I import the necessary libraries to get this to work? > > > Dan > > > On Jul 12, 7:24 pm, mdipierro <[email protected]> wrote: > > > > You can determine if it running on gae from > > > > request.env.web2py_runtime_gae > > > > You do not need any conditional import, perhaps I do not understand > > > the question. > > > > On Jul 12, 8:40 pm, Dan <[email protected]> wrote: > > > > > Sorry, I'm afraid I'm still not getting it. > > > > > I can see how it would be possible to pass the request object to each > > > > function within my custom module, and then decide if it's appropriate > > > > to import the GAE-specific routines. This conditional import would > > > > need to happen in every function within my custom module, correct? > > > > > But it would be nicer to avoid duplicating that import -- if it's > > > > possible to do the conditional import at the top of a module. It seems > > > > to me that a conditional import statement at the top of a custom > > > > module cannot successfully reference the request object -- because it > > > > is not contained in a function, so I don't know how to pass the > > > > request object to the module - is that possible? Or is there another > > > > way to determine if it's running on GAE? > > > > > Dan > > > > > On Jul 12, 8:42 am, mdipierro <[email protected]> wrote: > > > > > > You can one one import statement at the top of the module. > > > > > > As far as global objects, it depends. I suggest defining a class, pass > > > > > the globals to the contructor, store them, so that all methods have > > > > > access to them as needed. > > > > > > On Jul 12, 9:42 am, Dan <[email protected]> wrote: > > > > > > > ok, that makes sense. And would I need to put import statements > > > > > > inside each function in my custom module? Or can I do something to > > > > > > get > > > > > > that module-level reference to request/response/session/etc working? > > > > > > > On Jul 11, 10:21 pm, mdipierro <[email protected]> wrote: > > > > > > > > This is not a bad idea but there some rules to follow. > > > > > > > > request, response, session, cache, T are global objects in web2py > > > > > > > so > > > > > > > if you import a function from a module, you have to pass those 5 > > > > > > > objects to the function (not all of them, only those you need). > > > > > > > You > > > > > > > probably want to pass your database connection too. > > > > > > > > All the other web2py keywords can be imported from your modules as > > > > > > > needed. > > > > > > > > Massimo > > > > > > > > On Jul 11, 5:48 pm, Dan <[email protected]> wrote: > > > > > > > > > Hello- > > > > > > > > I want to re-use some data access routines in a few different > > > > > > > > controller files, so I would like to put them in a separate > > > > > > > > file in > > > > > > > > the /modules directory, and then import that file into the > > > > > > > > controller > > > > > > > > files that need them. However, I'm running into this error > > > > > > > > because I'm > > > > > > > > trying to use some web2py stuff in my module, like caching - > > > > > > > > and this > > > > > > > > is a conditional import that depends on accessing the request > > > > > > > > variable. > > > > > > > > > in /modules/my_module.py: > > > > > > > > if request.env.web2py_runtime_gae: # if running on Google App > > > > > > > > Engine > > > > > > > > from gluon.contrib.gae_memcache import MemcacheClient > > > > > > > > cache.ram=cache.disk=MemcacheClient(request) > > > > > > > > > error: > > > > > > > > name 'request' is not defined > > > > > > > > > Another way to put it is that I'm building an abstraction layer > > > > > > > > on top > > > > > > > > of web2py's DAL so that I can reuse my code. Is this possible? > > > > > > > > Or > > > > > > > > maybe a bad idea? > > > > > > > > > Dan --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "web2py Web Framework" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/web2py?hl=en -~----------~----~----~----~------~----~------~--~---
