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List: qgis-user
Subject: [Qgis-user] Access attributes of temp "layer" before loading into qgis
From: Wolfgang Meinolf <wmeinolf () bbv-deutschland ! de>
Date: 2021-09-14 9:43:32
Message-ID: AM9PR08MB7216BFC46A2DF4E61D7E3DA1ECDA9 () AM9PR08MB7216 ! eurprd08 ! prod ! outlook ! com
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To: qgis forum <qgis-user@lists.osgeo.org>
Subject: Access attributes of temp "layer" before loading into qgis
Date: Tue, 14 Sep 2021 09:43:32 +0000
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Hi,
In my scripts I work intensively with processing algs. In the script the processing \
algs "OUTPUT" is set to QgsProcessing.TEMPORARY_OUTPUT. The result is written to \
i.e. outputs [ResultFirststAlg]. When I like to feed the result in the next alg \
inside the same script, I set "INPUT" of the following alg to outputs \
[ResultFirststAlg] [OUTPUT]. So far so good.
Now, I like to change some attributes in the Layer, which is at outputs \
[ResultFirststAlg] [OUTPUT]. I can do this with the field calculator, however the \
results are then stored in a new layer, i.e. outputs [FieldCalc] [OUTPUT].
Currently I load the layer into qgis by using loadlayer alg at the end of the first \
script. Then I start a new script, which address the layer via Layer = \
QgsProject.instance().mapLayersByName(‘Loaded Layer from first script'), calculate \
the index by LayerIndex = Layer [0] or the Name for algs as LayerName = \
LayerIndex.name().
Now, when I consolidate the scripts, I cannot select by layername, as the loadlayer \
seems to be processed at the end of the script.
Is there any way, to modify attribute values directly in the initial layer at \
outputs [ResultFirststAlg] [OUTPUT]?
Thanks in advance
Wolfgang
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<p class="MsoNormal">Hi,<o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-US">In my scripts I work intensively with \
processing algs. In the script the processing algs "OUTPUT" is set to \
QgsProcessing.TEMPORARY_OUTPUT. The result is written to i.e. outputs \
[ResultFirststAlg]. When I like to feed the result in the next alg inside the same \
script, I set "INPUT" of the following alg to outputs [ResultFirststAlg] [OUTPUT]. So \
far so good.<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">Now, I like to change some attributes in the Layer, which is at outputs \
[ResultFirststAlg] [OUTPUT]. I can do this with the field calculator, however \
the results are then stored in a new layer, i.e. outputs [FieldCalc] \
[OUTPUT].<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">Currently I load the layer into qgis by using loadlayer alg at the end \
of the first script. Then I start a new script, which address the layer via Layer = \
QgsProject.instance().mapLayersByName(‘Loaded Layer from first script'), calculate \
the index by LayerIndex = Layer [0] or the Name for algs as LayerName = \
LayerIndex.name().<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">Now, when I consolidate the scripts, I cannot select by layername, as \
the loadlayer seems to be processed at the end of the script.<o:p></o:p></span></p> \
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p> <p \
class="MsoNormal"><span lang="EN-US">Is there any way, to modify attribute values \
directly in the initial layer at outputs [ResultFirststAlg] \
[OUTPUT]?<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">Thanks in advance<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US">Wolfgang<o:p></o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"><o:p> </o:p></span></p> <p class="MsoNormal"><span \
lang="EN-US"> <o:p></o:p></span></p> </div>
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