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","down
>>>> load_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
>>>>
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>>
>> --
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