On Jul 22, 2009, at 5:03 PM, Yarko Tymciurak wrote:
> On Wed, Jul 22, 2009 at 6:59 PM, Jonathan Lundell
> <jlund...@pobox.com> wrote:
> On Jul 21, 2009, at 9:14 PM, Yarko Tymciurak wrote:
>
>> There is a section in the new book draft which covers Self-
>> Reference and Aliases (self-reference notation was added, I
>> believe, after the first version went to print).
>
> Yes, I've read it. What I'm saying is that it ought to be extended
> to include a two-table cross-reference example.
>
> You think that's necessary? would be additionally helpful??
I think so, yes. Not necessarily an entire example, perhaps, but at
least an explicit mention of that use.
The other shortcoming, as I recall, is that the deferred 'reference'
isn't fully defined. When is it evaluated, as opposed to a direct
table reference, for example?
>
>
>>
>> On Tue, Jul 21, 2009 at 10:53 PM, Jonathan Lundell <jlund...@pobox.com
>> > wrote:
>>
>> On Jul 21, 2009, at 8:49 PM, Yarko Tymciurak wrote:
>>
>> > There are two formats for declaring a reference:
>> >
>> > ....
>> > db.Field('owner', db.other_table) # this must have other_table
>> > already defined, or it is a Python error;
>> > ...
>> > db.Field('owner', 'reference other_table') # this is delayed
>> > evaluation, and what you would use to have two tables cross link
>> > each other;
>> >
>>
>> This could use a little more detail in the manual, which talks about
>> it in terms of self-reference, but doesn't really explain the
>> mechanism, or mention the cross-reference usage. IIRC.
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"web2py-users" group.
To post to this group, send email to web2py@googlegroups.com
To unsubscribe from this group, send email to
web2py+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/web2py?hl=en
-~----------~----~----~----~------~----~------~--~---
