Hello,
I'm trying to select features based on the code from the ArcGIS Blog Generating a choice list from a field.
But in my Script i use two fields to select the features. The script works, but needs a long time to handle big datasets, so i wanted to add an extent to delimit my input feature class. I tried to do it with arcpy.env.extent but this isnt working.
Since this all needs to happen in advance, the validation code needs to be adjusted:
import arcpy
class ToolValidator:
# Class to add custom behavior and properties to the tool and tool parameters.
def __init__(self):
# set self.params for use in other function
self.params = arcpy.GetParameterInfo()
self.spatial_extent = None
def initializeParameters(self):
# Customize parameter properties.
# This gets called when the tool is opened.
return
def updateParameters(self):
# Modify parameter values and properties.
# This gets called each time a parameter is modified, before
# standard validation.
fc_param = self.params[0]
extent_param = self.params[1]
field1_param = self.params[2]
value1_param = self.params[3]
field2_param = self.params[4]
value2_param = self.params[5]
if extent_param.value:
self.spatial_extent = extent_param.value
else:
self.spatial_extent = None
if fc_param.value and field1_param.value and value1_param.value and field2_param.value:
fc, col2 = str(fc_param.value), str(field2_param.value)
wc = f"{field1_param.value} = '{str(value1_param.value)}'" if value1_param.value is not None else None
if wc is not None:
# Apply spatial extent filter if it's defined
if self.spatial_extent:
arcpy.env.extent = self.spatial_extent
value2_param.filter.list = [str(val) for val in sorted(
set(row.getValue(col2) for row in arcpy.SearchCursor(fc, fields=col2, where_clause=wc) if
row.getValue(col2) is not None))]
else:
value2_param.filter.list = []
if value2_param.value not in value2_param.filter.list:
value2_param.value = value2_param.filter.list[0]
elif fc_param.value and field1_param.value:
fc, col1 = str(fc_param.value), str(field1_param.value)
# Apply spatial extent filter if it's defined
if self.spatial_extent:
arcpy.env.extent = self.spatial_extent
value1_param.filter.list = [str(val) for val in sorted(
set(row.getValue(col1) for row in arcpy.SearchCursor(fc, fields=col1) if row.getValue(col1) is not None))]
if value1_param.value not in value1_param.filter.list:
value1_param.value = value1_param.filter.list[0]
return
How could i solve this?
Thanks in advance.
