I will bother with one last related question: *what about callback
triggers?*
I'm defining them like this:
db.define_table('mytable', Field('field1'), Field('field2')) # defines the
table
from myglobals import myfunction # imports global function
db.mytable._after_update.append(lambda s, r: myfunction(s, r)) # defines
after update callback trigger
In this case, I guess lazy_tables=True wouldn't make sense, because I'm
calling db.mytable so it triggers the definition of the table.
Is there a way of specifying callback triggers directly when calling
define_table?
El jueves, 17 de marzo de 2016, 15:27:22 (UTC-3), Lisandro escribió:
>
> Oh I see! So I can define the virtual/method fields that way, and then it
> does make sense to keep using lazy_tables. Completely missed that point.
>
> Thank you very much!
> As always, web2py's community rocks.
>
>
>
> El jueves, 17 de marzo de 2016, 14:59:35 (UTC-3), Anthony escribió:
>>
>> On Thursday, March 17, 2016 at 1:53:43 PM UTC-4, Lisandro wrote:
>>>
>>> Thank you very much for the quick answer.
>>>
>>> Your first comment made me think about the "lazy_tables" with the
>>> definition of virtual method fields.
>>> If you say that doing db.tablename the table is no longer lazy, *then
>>> it wouldn't make sense to use lazy_tables in a particular case where almost
>>> each table has a virtual method field, am I right?*
>>>
>>> I mean, for example, if this is my model:
>>>
>>> db.define_table('first_table', Field('field1'), Field('field2'))
>>>
>>> db.first_table.field3 = Field.Method(lambda row: 'value for field3')
>>>
>>
>> This won't help with db.auth_user, which is defined automatically (though
>> you can define it manually yourself if preferred), but you can simply do:
>>
>> db.define_table('first_table',
>> Field('field1'),
>> Field('field2'),
>> Field.Method('Field3', lambda row: 'value for field3'))
>>
>> Note, the first argument of Field.Method() and Field.Virtual() should
>> always be the field name anyway, even if you are defining them like this:
>>
>> db.mytable.myfield = Field.Method('myfield', ...)
>>
>> There are particular cases where leaving the name out can lead to
>> problems.
>>
>> Anthony
>>
>
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