Zooming to extent of filtered vector layer using PyQGIS?

Question

I have a vector layer that I need to filter and zoom to extent of the layer whilst the filter is applied. Most of the examples I see only zoom to selected features. I have managed to filter using

p_id = 31
filter_rule = ' id = %s ' % p_id
qExp = QgsExpression(filter_rule)
qReq = QgsFeatureRequest(qExp)
features = layer.getFeatures(qReq)

How can I zoom to the extent to only show the feature which corresponds to the filter?

Answer 1

One method is to filter the features using the setSubsetString() method. Once your layer is filtered, you can then set the canvas extent which is only affected by the remaining features of the layer:

layer = iface.activeLayer()
canvas = qgis.utils.iface.mapCanvas()

p_id = 31
filter_rule = ' id = %s ' % p_id    
layer.setSubsetString(filter_rule)  
canvas.setExtent(layer.extent())