[QGIS-Developer] Problems implementing a plugin to work layers offline

Francisco Danubio Salas Rosette franksalas1965 at gmail.com
Thu Mar 26 06:30:33 PDT 2020

I am new to the plugin programming for Qgis, I am trying to create one
project with offline layers and later update the database in postgis. I was
reviewing some documentation and plugin on the subject, but I am unable to
solve a problem I am having.
I am creating the offline project in  geopackage or spatialite, but when I
delete objects or modify and synchronize, it shows me the same objects that
I downloaded from the database. What am I doing wrong?
This is part of my code:

def download_project(self):
    """Download selected project to convert it offline."""
    proj = QgsProject.instance()

    project_name = proj.title()

    layer_ids_to_download = [
        for layer_id, layer in proj.mapLayers().items()

    offliner = QgsOfflineEditing()
def sincronizar(self):
    offliner = QgsOfflineEditing()

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