I'm assuming you're talking about a primary key made up of multiple
fields. Is that correct.
I've never done that, but I don't see how it would change anything other
than the 'left' setup.
-Jim
On Fri, Jul 21, 2017 at 5:54 AM, 'Matthew J Watts' via web2py-users <
web2py@googlegroups.com> wrote:
>
> Hi, do you know if this is the same when i use primary keys of legacy
> tables - doesn't seem to be working when i change my tables to primary key.
> thanks
>
> On Wed, Jul 19, 2017 at 4:10 PM, Jim S <ato.st...@gmail.com> wrote:
>
>> We were all there once. Glad I was able to help. Part of the beauty of
>> web2py is the community and the friendly help you can get on this group.
>>
>> -Jim
>>
>> On Wednesday, July 19, 2017 at 9:26:08 AM UTC-5, Matthew J Watts wrote:
>>>
>>> Great thanks Jim, that did it for me - it's hard being a beginner!!
>>>
>>> On Wed, Jul 19, 2017 at 2:09 PM, Jim S <ato....@gmail.com> wrote:
>>>
>>>> I'd start first with changing this:
>>>>
>>>> links = [lambda ids: A('Download data set',_href=URL("default","down
>>>> load_dataset.csv",args=[ids.id]))]
>>>>
>>>> to this:
>>>>
>>>> links = [lambda ids: A('Download data set',_href=URL("default","down
>>>> load_dataset.csv",args=[ids.MAIN.id <http://ids.id/>]))]
>>>>
>>>> When you add the LEFT join you then need to specify which table to get
>>>> the field from.
>>>>
>>>> -Jim
>>>>
>>>>
>>>> On Wednesday, July 19, 2017 at 6:44:45 AM UTC-5, Matthew J Watts wrote:
>>>>>
>>>>> Hi all
>>>>>
>>>>> I'm having some problems trying to achieve the following
>>>>>
>>>>> I have a grid with left joins which selects a subset of entries in my
>>>>> database -(query between 3 tables)
>>>>>
>>>>> i then want to be able to set up links within the grid that sends the
>>>>> id from each row (MAIN table) to a seperate function (another query
>>>>> between
>>>>> many tables).
>>>>>
>>>>> I then want to trigger a download 'csv' file.
>>>>>
>>>>> So far, I have managed to get this working if I use one table in the
>>>>> grid (no left joins), however when i set up left joins within the grid,i
>>>>> get an 'AttributeError' message. Somehow, by setting up the left
>>>>> joins, i loose the main id that i want to send to the seperate function -
>>>>> although i have set up 'field_id=db.MAIN.id <http://db.main.id/>' in
>>>>> the grid
>>>>>
>>>>> Here's the code:
>>>>>
>>>>> *Controller*
>>>>>
>>>>> def vec_dyn_query():
>>>>> links = [lambda ids: A('Download data
>>>>> set',_href=URL("default","download_dataset.csv",args=[ids.id]))]
>>>>> grid = SQLFORM.grid((db.MAIN),
>>>>> field_id=db.MAIN.id,
>>>>> left = [db.StudyLocation.on(db.MAIN.LocationID
>>>>> == db.StudyLocation.id), db.TAXON.on(db.MAIN.TaxonID == db.TAXON.id)],
>>>>> links=links,
>>>>> deletable=False, editable=False,
>>>>> details=False, selectable=False, create=False, csv=False)
>>>>> return locals()
>>>>>
>>>>> def download_dataset():
>>>>> main_id = request.args(0,cast=int)
>>>>> dataset = db(db.MAIN.id == request.args[0]).select()
>>>>> return dict(dataset=dataset)
>>>>>
>>>>> *Views*
>>>>>
>>>>> {{
>>>>> import cStringIO
>>>>> stream = cStringIO.StringIO()
>>>>> dataset.export_to_csv_file(stream)
>>>>> response.headers['Content-Type'] = 'text/csv'
>>>>> response.write(stream.getvalue(), escape=False)
>>>>> }}
>>>>>
>>>>> Note - if i take away the 'left = [db.StudyLocation.on(db.MAIN.LocationID
>>>>> == db.StudyLocation.id), db.TAXON.on(db.MAIN.TaxonID == db.TAXON.id)],'
>>>>> Everything works fine
>>>>>
>>>>> Thanks for your help in advance
>>>>>
>>>>> Matt
>>>>>
>>>> --
>>>> Resources:
>>>> - http://web2py.com
>>>> - http://web2py.com/book (Documentation)
>>>> - http://github.com/web2py/web2py (Source code)
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>>>
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