processing.getObject() in QGIS 3

Question

It seems that processing.getObject() is no longer available in QGIS.

from PyQt5.QtCore import *
from qgis.core import *
#...
layer = processing.getObject(layer)

# -> ...module 'processing' has no attribute 'getObject'

Is there a new way to use get.Object?

Answer 1

I have a copy of the QGIS github project locally, it's a few months old but I was able to find where this changed.

It's worth checking the list of API changes, which mentions this

dataobjects.getLayerFromString() was removed. Use QgsProcessingUtils.mapLayerFromString() instead.

Using git line annotations I was able to trace this back to a change made a few months ago...

it looks as if a few methods (including getObject) were refactored out and replaced with a single getLayerFromString() method

def getLayerFromString(string, forceLoad=True):
    """Returns an object (layer/table) given a source definition.

    if forceLoad is true, it tries to load it if it is not currently open
    Otherwise, it will return the object only if it is loaded in QGIS.
    """
    ...

But since then it's been moved to QgsProcessingUtils.

So you could try using QgsProcessingUtils.mapLayerFromString()

If using QGIS 2.x, you should still be able to use getObject() as before (can check using print(processing.__dict__['getObject'])

Answer 2

Method 'processing.getObject()' is still available in QGIS. It can be observed at net image:

So, the workaround is as follow:

>>>import processing
>>>layer =  processing.getObject("/home/zeito/pyqgis_data/polygon8.shp")
>>>layer
<qgis._core.QgsVectorLayer object at 0x9a9c0104>