QgsProcessingAlgorithm / add Layer to project

[qgib]

Author Name: Valérian LEBERT (Valérian LEBERT)
Original Redmine Issue: 21676
Affected QGIS version: 3.4.5
Redmine category:processing/core

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Hi,

I am trying to add a layer to project in a QgsProcessingAlgorithm.

I tried the folowing code :

vlayer1 = QgsVectorLayer('Point?crs=epsg:4326&field=id:integer&field=name:string(20)&index=yes', 'vlayer1', "memory")
vlayer2 = QgsVectorLayer('Point?crs=epsg:4326&field=id:integer&field=name:string(20)&index=yes', 'vlayer2', "memory")
vlayer3 = QgsVectorLayer('Point?crs=epsg:4326&field=id:integer&field=name:string(20)&index=yes', 'vlayer3', "memory")
vlayer4 = QgsVectorLayer('Point?crs=epsg:4326&field=id:integer&field=name:string(20)&index=yes', 'vlayer4', "memory")

context.addLayerToLoadOnCompletion(vlayer1.id(),context.LayerDetails('toto', QgsProject.instance(), self.OUTPUT))
context.addLayerToLoadOnCompletion(vlayer2.id(),context.LayerDetails('toto', context.project(), self.OUTPUT))
QgsProject.instance().addMapLayer(vlayer3, True)
context.project().addMapLayer(vlayer4, True)

None of the layer is loaded.
OUTPUT variable is a string :
OUTPUT = 'OUTPUT'

I get a warning on processing feedback with no details in message log :

Chargement des couches de résultat
Les couches suivantes n'ont pas été générées correctement.

• vlayer1_98306459_f1bc_4285_b8dc_660502e5cb47
• vlayer2_040a7ea0_7a5f_4e02_bfd1_4ce311c60219

Vous pouvez vérifier le Panel de messages du journal dans la fenêtre principale de QGIS pour trouver plus d'informations à propos de l'exécution de l'algorithme.

Am i doing wrong or is there something broken in procesing API?

Thanks
Valérian

[qgib]

Author Name: Giovanni Manghi (@gioman)

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If this is not an issue report but rather a question this should be posted in the proper channels, the users/devolpers mailing lists, etc.

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• status_id was changed from Open to Feedback

[qgib]

Author Name: Alexander Bruy (@alexbruy)

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• resolution was changed from to no timely feedback
• status_id was changed from Feedback to Closed