Maybe something like that?
db.define_table('person', Field('first_name'), Field('last_name'),
format='%(first_name)s')
db.define_table('thing', Field('name'),
Field('owner_id', 'reference person'),
format='%(name)s')
t = db.thing
p = db.person
fields = [p.first_name, p.last_name]
q = ((t.owner_id == p.id) & (t.name == 'chair'))
ids_people_with_chair = [a.id for a in db(q).select(p.id)]
query = (t.owner_id == p.id)
query = query & (t.owner_id.belongs(ids_people_with_chair))
query = query & (t.name == 'table')
print db(query).select(*fields, distinct=True, orderby=p.first_name)
On Fri, May 8, 2015 at 10:49 PM, Spokes <spokes8...@gmail.com> wrote:
> Hi, Dave. Yes, that seems to be an accurate summary of what I was
> attempting to do.
>
>
>
> On Friday, May 8, 2015 at 3:25:24 PM UTC-5, Dave S wrote:
>>
>>
>>
>> On Friday, May 8, 2015 at 11:55:13 AM UTC-7, Spokes wrote:
>>>
>>> I'd like to create a grid based on criteria relating to a primary table,
>>> and a table that references that primary table. Slightly modifying the
>>> example from the web2py docs, let's say the primary table is 't_person',
>>> and it's referenced by the table, 't_thing'. I'd like the grid to list
>>> 't_person' entries that are referenced by a 't_thing' entry with a value
>>> 'table' for the 'name' field, and by a 't_thing' entry with value 'chair'
>>> for the name field (that is, entries that meet both criteria, not one or
>>> the other).
>>>
>>>
>> Let's see if I understand this. You want to use the set A of t_things
>> that have value 'table' and the set B of t_things that have value 'chair'
>> and find those members of t_person that are referenced by both sets? Sort
>> of "for a in A where a.owner_id == b.owner_id for b in B, select p from
>> t_person where p.id == a.owner_id ?
>>
>> /dps
>>
>> --
> Resources:
> - http://web2py.com
> - http://web2py.com/book (Documentation)
> - http://github.com/web2py/web2py (Source code)
> - https://code.google.com/p/web2py/issues/list (Report Issues)
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--
Massimiliano
--
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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