Parameter B selection of features based on Parameter A Geodatabase - Python Toolbox

Jake_S — Fri, 20 Oct 2023 21:08:58 GMT

Hey folks,

New to python toolboxes.

What I'm looking to do

parameter A - user defined Geodatabase

parameter B - list of features in parameter A or in datasets within parameter A the user can select one or more

Then the execute code does thing to those selected features only

I'm a bit stumped is this possible.

Current code

# -*- coding: utf-8 -*- import arcpy class Toolbox(object): def __init__(self): """Define the toolbox (the name of the toolbox is the name of the .pyt file).""" self.label = "Toolbox" self.alias = "toolbox" # List of tool classes associated with this toolbox self.tools = [Tool] class Tool(object): def __init__(self): """Define the tool (tool name is the name of the class).""" self.label = "Parcel Migration Data Conversion" self.description = "" self.canRunInBackground = False def getParameterInfo(self): """Define parameter definitions""" # Create a geodatabase parameter geodatabase = arcpy.Parameter( displayName="Input Geodatabase", name="geodatabase", datatype="DEWorkspace", parameterType="Required", direction="Input") # Create a feature class parameter feature_classes = arcpy.Parameter( displayName="Feature Classes", name="feature_classes", datatype="DEFeatureClass", parameterType="Required", direction="Input", multiValue=True) #feature_classes.filter.list = [] #feature_classes.parameterDependencies = [geodatabase.name] # Add the parameters to a parameter list params = [geodatabase, feature_classes] return params def isLicensed(self): """Set whether tool is licensed to execute.""" return True def updateParameters(self, parameters): """Modify the values and properties of parameters before internal validation is performed. This method is called whenever a parameter has been changed.""" gdb = parameters[0] fclist = [] for fc in arcpy.ListFeatureClasses(feature_dataset=gdb): fclist.append(fc) parameters[1].filter.list = fclist return def updateMessages(self, parameters): """Modify the messages created by internal validation for each tool parameter. This method is called after internal validation.""" return def execute(self, parameters, messages): """The source code of the tool.""" ## do stuff code goes here "params[1] = list of features" return def postExecute(self, parameters): """This method takes place after outputs are processed and added to the display.""" return

Current script toolbox and geodatbase

Thanks in advance!

Re: Parameter B selection of features based on Parameter A Geodatabase - Python Toolbox

BlakeTerhune — Fri, 20 Oct 2023 21:50:04 GMT

I think you need to define parameter B as GPValueTable and populate the ValueList filter with a list of feature class names.

Defining parameters in a Python toolbox—ArcGIS Pro | Documentation

Re: Parameter B selection of features based on Parameter A Geodatabase - Python Toolbox

StaticK — Sat, 04 Nov 2023 15:12:57 GMT

You have your gdb set to the feature dataset parameter in the List Featureclass which I think will return in an empty list. You need to iterate through the gdb, by setting the arcpy.env.workspace to the gdb and use ListDatasets() with ListFeatureClasses to get them:

arcpy.env.workspace = gdb if self.params[0].altered: _tmparray = [] for ds in [ds for ds in arcpy.ListDatasets(feature_type='feature') if ds is not None and ds != '']: for fc in [fc for fc in arcpy.ListFeatureClasses(feature_dataset=ds) if fc not in fcExclude]: # append featureclass string to the fc list _tmparray.append(fc) fcFilter = self.params[1].filter fcFilter.list = _tmparray

Adding the .altered flag to that param will execute the list filter each time a new gdb is selected.

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Parameter B selection of features based on Parameter A Geodatabase - Python Toolbox

Re: Parameter B selection of features based on Parameter A Geodatabase - Python Toolbox

Re: Parameter B selection of features based on Parameter A Geodatabase - Python Toolbox