Using Python code from QGIS 3.x Graphical Modeler in console?

Question

I want to use "Join Attribute by Location (summary)" processing algorithm in Python console of QGIS 3.10. After design my algorithm process (join sum of field name "abc" form layer 2 (point layer) to layer 2 (polygon layer), I exported it as script algorithm as follow:

from qgis.core import QgsProcessing
from qgis.core import QgsProcessingAlgorithm
from qgis.core import QgsProcessingMultiStepFeedback
from qgis.core import QgsProcessingParameterVectorLayer
from qgis.core import QgsProcessingParameterFeatureSink
import processing
class Model(QgsProcessingAlgorithm):
 def initAlgorithm(self, config=None):
 self.addParameter(QgsProcessingParameterVectorLayer('layer1', 'Layer 1', types=[QgsProcessing.TypeVectorPolygon], defaultValue=None))
 self.addParameter(QgsProcessingParameterVectorLayer('layer2', 'Layer 2', types=[QgsProcessing.TypeVectorPoint], defaultValue=None))
 self.addParameter(QgsProcessingParameterFeatureSink('Output', 'Output', type=QgsProcessing.TypeVectorAnyGeometry, createByDefault=True, defaultValue=None))
 def processAlgorithm(self, parameters, context, model_feedback):
 # Use a multi-step feedback, so that individual child algorithm progress reports are adjusted for the
 # overall progress through the model
 feedback = QgsProcessingMultiStepFeedback(1, model_feedback)
 results = {}
 outputs = {}
 # Join attributes by location (summary)
 alg_params = {
 'DISCARD_NONMATCHING': False,
 'INPUT': parameters['layer1'],
 'JOIN': parameters['layer2'],
 'JOIN_FIELDS': '[abc]',
 'PREDICATE': [1],
 'SUMMARIES': [5],
 'OUTPUT': parameters['Output']
 }
 outputs['JoinAttributesByLocationSummary'] = processing.run('qgis:joinbylocationsummary', alg_params, context=context, feedback=feedback, is_child_algorithm=True)
 results['Output'] = outputs['JoinAttributesByLocationSummary']['OUTPUT']
 return results
 def name(self):
 return 'model'
 def displayName(self):
 return 'model'
 def group(self):
 return ''
 def groupId(self):
 return ''
 def createInstance(self):
 return Model()

Now I want to copy this code in Python console of QGIS and use it, but with run this code in console, I don't receive any result. How can I use this code?

Answer 1

Once you run that code in the console, the name Model refers to the class of your algorithm. Instantiate the algortihm:

alg = Model()

Then, execute its dialog:

processing.execAlgorithmDialog(alg)