[Qgis-developer] Looping over features in processing

[Victor Olaya]

Unfortunately, there is not configuration for the output names, it just
uses the input name you enter for the output and add numbers as a suffix.

Being able to use an attribute value instead of numbers sounds to me like a
nice improvement, so if you can open a feature request, i will work on it
when i have some time.

Let me know if you have more ideas

Cheers

2015-07-24 21:22 GMT+02:00 Tim Sutton <tim at qgis.org>:

> Hi
>
> On 24 Jul 2015, at 20:06, Paolo Cavallini <cavallini at faunalia.it> wrote:
>
>
> Ah thanks, got it now. Any idea how I can write the output layers out with
> e.g.
>
> <feature_name>_roads.shp
> <feature_name>_buildings.shp
>
> (I’m basically trying to iteratively loop through wards, clipping out all
> the roads and buildings for each ward to a file named on the ward name).
>
> Also being able to put the date into the name would be great.
>
> Regards
>
> Tim
>
> Just click on the small green arrow besides layer name.
> Cheers.
>
> Il 24 luglio 2015 18:40:33 CEST, Tim Sutton <tim at qgis.org> ha scritto:
>>
>> Hi
>>
>> On 23 Jul 2015, at 22:44, Tim Sutton <tim at qgis.org> wrote:
>>
>> Hi Victor
>>
>> On 23 Jul 2015, at 22:18, Victor Olaya <volayaf at gmail.com> wrote:
>>
>> Tim
>>
>> What you are describing is the behaviour of the iterative execution of
>> algorithms (for a layer with n features, it runs the algorihtm n times,
>> each of them using as input a layer with only one of those features). That
>> can be executed without the need to code anything, from the algorithm
>> dialog.
>>
>>
>> Yeah that sounds exactly like what I am after. I will go and take a look
>> at that.
>>
>>
>>
>> Sorry to be a bit slow here - I went back to try this and couldn’t see
>> where / how to do it - can you give a few more pointers?
>>
>> Thanks!
>>
>> Regards
>>
>> Tim
>>
>>
>> Thanks!
>>
>> Regards
>>
>> Tim
>>
>> If it's not exactly what you are looking for and you want to code
>> something similar, maybe you can at least check the corresponding code to
>> get some ideas
>>
>>
>> https://github.com/qgis/QGIS/blob/master/python/plugins/processing/gui/AlgorithmExecutor.py#L58
>>
>> Let me know if you have more questions
>>
>> Cheers
>>
>>
>>
>> 2015-07-23 20:15 GMT+02:00 Tim Sutton <tim at qgis.org>:
>>
>>> Hi all
>>>
>>> Is it possible to write loops in processing. I’d like to do stuff like
>>> iterate over each poly in a polygon layer, clip features from a few layers
>>> and write them to a subfolder whose name is based on the name of the
>>> polygon layer. Think of it like atlas but for data not for print
>>> compositions. Has anyone done something similar?
>>>
>>> Regards
>>>
>>> Tim
>>>
>>>
>>> <PastedGraphic-1.tiff>
>>>
>>>
>>> Tim Sutton
>>> QGIS Project Steering Committee Member
>>> tim at qgis.org
>>>
>>>
>>>
>>>
>>>
>>> _______________________________________________
>>> Qgis-developer mailing list
>>> Qgis-developer at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/qgis-developer
>>>
>>
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>>
>> Tim Sutton
>> QGIS Project Steering Committee Member
>> tim at qgis.org
>>
>>
>>
>>
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>>
>>
>>
>> Tim Sutton
>> QGIS Project Steering Committee Member
>> tim at qgis.org
>>
>>
>>
>>
>>
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>>
> --
> Paolo Cavallini
> http://www.faunalia.eu
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>
>
>
> Tim Sutton
> QGIS Project Steering Committee Member
> tim at qgis.org
>
>
>
>
>
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