I tried to avoid serialize these data structures from different forms to
disk (default session storage). But you are probably right, that is can be
a good solution ...
Dne pátek, 2. srpna 2013 21:19:26 UTC+2 Anthony napsal(a):
>
> Is there a reason this can't be done using the session?
>
> Anthony
>
> On Friday, August 2, 2013 3:10:55 PM UTC-4, David Marko wrote:
>>
>> I'm trying to implement the viewScope variables for web2py controller
>> methods. Idea behind is to mimic a behaviour of JAVA frameworks like JSF or
>> Spring that use the concept of viewScope variables. Such variables live
>> during the all posts to same controller action / to the same form. This is
>> very handy when one is doing some heavy form actions or wizard actions etc.
>> that we do all the time in corporate development. Using the viewScope
>> variable one can avoid using a hidden fields (which using is rather a
>> security issue as user can easily change the value in browser using dev
>> tools.)
>>
>> Now my idea expressed in code snippet below is to generate UUID value
>> during the get request (the first request to controller action) and store
>> it into hidden form field. This hidden UUID is used as a key for cache.ram
>> value that expresses the viewScope variable. I use Storage() object as a
>> viewScope object as it is very easy to use. Now everything is working as
>> expected and during the all posts to same action (all posts of SQLFORM)
>> the hidden key is available and I can access the the same cach.ram
>> Storage() object, read and update values and everything is working fine.
>> What is not fine is fact that cache expire_time is timeout counted from the
>> first cache object creation time and expires in defined time. What I need
>> here is to have the expire time but prolonged each time I access the cache
>> so the expire time reflects users inactivity. Is there a way how to
>> accomplish this idea using the cache.ram? Also is there anyone who tried
>> to solve this already? I would appreciate your ideas / comments.
>>
>> BTW: Despite the fact that HTTP is not statefull .. the statefull
>> framework features are very important during corporate development (during
>> forking with large form that requires many post submits until saved
>> finaly). I would really appreciate having some statefull ideas implemented
>> in web2py core. But its completely separate topic.
>>
>> (Code below is just a proof of concept more than some final nice code.
>> :-) )
>>
>> class ViewState:
>>
>> @staticmethod
>> def getStateObject(state_id=None):
>> if state_id==None:
>> state_id=ViewState.getStateId()
>> from gluon.storage import Storage
>> return cache.ram('form_'+state_id, lambda:Storage(), time_expire=
>> 10)
>>
>> @staticmethod
>> def getStateId(state_field='state_id'):
>> import uuid
>> return (request.post_vars.state_id or str(uuid.uuid4()))
>>
>> def index():
>> state_id=ViewState.getStateId()
>> sc=ViewState.getStateObject(state_id)
>>
>> form=SQLFORM.factory(
>> Field('jmeno','string',requires=IS_NOT_EMPTY()),
>> Field('prijmeni','string'),
>> hidden=dict(state_id=state_id)
>> )
>> ....
>>
>>
>>
>>
>>
>>
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