Hi, Yes, thank you - your example along with https://github.com/blazek/django-provider/blob/master/djangoprovider/provider.py is in fact what I am using to write my dataprovider.
I must have overlooked something, since the results are never iterated, but the logs are not helpful at all, unfortunately... :( There must be a reason why there is no attempt to iterate..? Mats On Fri, Nov 20, 2020 at 2:30 PM Alessandro Pasotti <[email protected]> wrote: > On Fri, Nov 20, 2020 at 2:22 PM Mats Taraldsvik > <[email protected]> wrote: > > > > Hi, > > > > I'm trying to create/prototype a custom QgsVectorDataProvider in Python > to retrieve data from a HTTP REST API. > > > > When testing, I do the following to register my provider: > > > > from qgis.core import QgsProviderRegistry, QgsProviderMetadata > > from provider import MyProvider > > registry = QgsProviderRegistry.instance() > > metadata = QgsProviderMetadata(MyProvider.providerKey(), > MyProvider.description(), MyProvider.createProvider) > > registry.registerProvider(metadata) > > layer = QgsVectorLayer(<my-url>, 'Test myprovider', 'myprovider-plugin') > > QgsProject.instance().addMapLayer(layer) > > This seems to initialize the provider, although it stops after the > constructor of MyFeatureIterator(QgsAbstractFeatureIterator) is run. > > For this test, data is retrieved from the REST API in the constructor, > and I can see in the logs that the data is retrieved. > > > > I expected it to start iterating objects, but the next message in the > log is prepareSimplification (I have added a log message to every class > method to watch progress in the logs), then nothing. > > > > I even installed qgis-dev and watched the logs using Microsoft's > DebugViewer, but I could not see any relevant information. > > > > Could someone please help me or tell me where to look to solve this > issue and start iterating with nextFeature/fetchFeature? Regards, > > > AFAIK there is only one example I wrote for testing purposes ages ago: > > https://github.com/qgis/QGIS/blob/master/tests/src/python/provider_python.py > > I'm not sure it will be useful but it's a start. > > Kind regards. > > -- > Alessandro Pasotti > QCooperative: www.qcooperative.net > ItOpen: www.itopen.it >
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