So I'm trying to create a Field Mappings input parameter for the ArcPy Spatial Join Analysis tool, but it spits up an error. When I try to create a Field Mapping object in the execute portion of my test script, I can successfully add Field Maps objects to the Field Mappings object. Below is an example of the error I get when trying to update the fields in updateParameters():
ValueError: FieldMappings:
AddFieldMap input not field map object
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This is the code:
def getParameterInfo(self):
targetfeatures= arcpy.Parameter(
displayName = "",
name = "",
datatype = "Feature Class",
parameterType = "Required",
direction = "Input")
fieldmapping= arcpy.Parameter(
displayName = "",
name = "",
datatype = "Field Mappings",
parameterType = "Required",
direction = "Input")
fieldmapping.value = str('Empty') #If I don't include this line, I get an error: AttributeError: 'NoneType' object has no attribute 'addFieldMap'
parameters = [targetfeatures, fieldmapping]
return parameters
def updateParameters(self, parameters): #optional
joinFeatures = parameters[0].value
joinfieldmap = arcpy.FieldMap()
joinfields = arcpy.ListFields(joinFeatures)
for joinfield in joinfields:
joinfieldname = unicodedata.normalize('NFKD', joinfield.name).encode('ascii','ignore')
try:
joinfieldmap.addInputField(joinFeatures, joinfieldname)
except:
pass
parameters[1].value.addFieldMap(joinfieldmap)
return
