I think the names are just confusing. tableA is the table field.
tableE in this case is a field of tableA. This is the normal way to
set a validator. The only point of the example is that in
IS_IN_DB(db, ...) db can be replaced by a SQLSet db(....).
On Oct 18, 4:09 pm, yarko <[EMAIL PROTECTED]> wrote:
> I'm sorry.... this reads a little bit like magic to me - can someone
> walk me through this line, and how it works:
>
> db.tableA.tableE.requires=.....
>
> I don't know how to read / make sense of this. Help please!
>
> I think I get the right side of this ( condition is the database
> selector; tableE.id is to be represended by the name filed out of
> tableE);
>
> Thanks,
> Yarko
>
> On Oct 18, 11:19 am, morningovermidnight <[EMAIL PROTECTED]>
> wrote:
>
> > Thanks!
>
> > On Oct 17, 10:33 am, mdipierro <[EMAIL PROTECTED]> wrote:
>
> > > db.define_table('tableE',SQLField('name'))
>
> > > db.define_table('tableA',SQLField('tableE',db.tableE),SQLField('name'))
>
> > > condition=db.tableE.name.like('%o') ## records where name ends in 'o'
> > > db.tableA.tableE.requires=IS_IN_DB(db(condition),'tableE.id','%
> > > (name)s')
>
> > > On Oct 17, 3:47 am, morningovermidnight <[EMAIL PROTECTED]>
> > > wrote:
>
> > > > Ok, here goes. I would like to add another table to my database and
> > > > link it to an already exsisting table in my database. Lets say the
> > > > existing table is table-E, and the table to add is table-A. Usually,
> > > > adding a table with a foreign key reference to another table is no
> > > > problem. But for this situation. I do not want every record from table-
> > > > E to provide a foreign key to table-A. I only want a subset of the
> > > > records from table-E to show up in table-A. How can I do this? I know
> > > > I can get a subset of records from table-E with a query, but then how
> > > > to add all the results of the query to table-A? And if a record is
> > > > removed or altered in table-E, will those changes be reflected on
> > > > related entries in table-A? Will the query be automatically updating?
> > > > Can a database column be an SQL query?
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"web2py Web Framework" group.
To post to this group, send email to web2py@googlegroups.com
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
-~----------~----~----~----~------~----~------~--~---
