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How to overwrite input parameter with output parameter in ArcPy?

DanaNajeeb

I created a custom geoprocessing tool using Python in ArcGIS Pro and published it to use in Web AppBuilder. The results show with no issues in ArcGIS Pro, however, in Web AppBuilder, they don't, I believe the issue has to do with not specifying the output parameter correctly.

My issue now is how would I specify the output parameter to be the same as the input parameter? I added the arcpy.env.overwriteOutput = True and I did set the output parameter to be derived. But when I run the tool, it doesn't give me any errors and it tells me that the results are drawn on the map, but the changes are not implemented.

Not too sure what I'm doing wrong.

Here's my Python script:

arcpy.env.overwriteOutput = True

#Inputs

Point1 = arcpy.GetParameterAsText(0)
Point2 = arcpy.GetParameterAsText(1)
Polygon = arcpy.GetParameterAsText(2)

#Outputs

out1 = arcpy.SetParameter(3, Point1)
out2 = arcpy.SetParameter(4, Point2)

# Select points that overlap the polygon
selected_points = arcpy.SelectLayerByLocation_management(Point1, 'INTERSECT',
Polygon)

#Append selected points to the other layer.
arcpy.Append_management(selected_points, Point2, 'NO_TEST')

#Deelete selected points from the original layer

arcpy.DeleteFeatures_management(selected_points)

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Accepted answers

Luke_Pinner

out1 = arcpy.SetParameter(3, Point1)
out2 = arcpy.SetParameter(4, Point2)

Should probably be at the end of the script. You're setting the outputs before doing anything with them. Try something like:

arcpy.env.overwriteOutput = True

#Inputs
Point1 = arcpy.GetParameterAsText(0)
Point2 = arcpy.GetParameterAsText(1)
Polygon = arcpy.GetParameterAsText(2)

# Select points that overlap the polygon
selected_points = arcpy.SelectLayerByLocation_management(Point1, 'INTERSECT',
Polygon).getOutput(0)

#Append selected points to the other layer.
arcpy.Append_management(selected_points, Point2, 'NO_TEST')

#Delete selected points from the original layer
arcpy.DeleteFeatures_management(selected_points)

OutPoint1 = arcpy.management.MakeFeatureLayer(Point1, "Point1")
OutPoint2 = arcpy.management.MakeFeatureLayer(Point2, "Point2")

#Outputs
out1 = arcpy.SetParameter(3, OutPoint1)
out2 = arcpy.SetParameter(4, OutPoint2)

All comments

DanaNajeeb

Oh, I get it now. Thank you very much!

Luke_Pinner

Specified_Polygon is a Result object not a FeatureLayer. Use Specified_Polygon = arcpy.SelectLayerByAttribute_management(etc...)[0] or arcpy.SelectLayerByAttribute_management(etc...).getOutput(0)

DanaNajeeb

Thank you very much for your reply! I just republished the geoprocessing tool and it worked, I don't know what I did wrong when I told you it didn't work.

One last question, I want to specify a specific feature in the polygon layer by specifying the objectid value, I tried to do the following script, again, it works in ArcGIS Pro but it doesn't in WAB. Do you have an idea what could be the issue?

DanaNajeeb

I tried that, still worked in ArcGIS Pro, but unfortunately, didn't change anything in the layer in Web AppBuilder. Thank you though!

Luke_Pinner

out1 = arcpy.SetParameter(3, Point1)
out2 = arcpy.SetParameter(4, Point2)

Should probably be at the end of the script. You're setting the outputs before doing anything with them. Try something like:

arcpy.env.overwriteOutput = True

#Inputs
Point1 = arcpy.GetParameterAsText(0)
Point2 = arcpy.GetParameterAsText(1)
Polygon = arcpy.GetParameterAsText(2)

# Select points that overlap the polygon
selected_points = arcpy.SelectLayerByLocation_management(Point1, 'INTERSECT',
Polygon).getOutput(0)

#Append selected points to the other layer.
arcpy.Append_management(selected_points, Point2, 'NO_TEST')

#Delete selected points from the original layer
arcpy.DeleteFeatures_management(selected_points)

OutPoint1 = arcpy.management.MakeFeatureLayer(Point1, "Point1")
OutPoint2 = arcpy.management.MakeFeatureLayer(Point2, "Point2")

#Outputs
out1 = arcpy.SetParameter(3, OutPoint1)
out2 = arcpy.SetParameter(4, OutPoint2)

DanaNajeeb

Sure, here's a screenshot.

For the dependency tab, I tried with and without it. But I don't seem to have the "Add result as operational layer" option available in the Web AppBuilder, in the widget settings, unless I specify the dependency parameter.

Luke_Pinner

How are parameters 3 & 4 defined in the toolbox? Data type, type, direction especially. Can you provide a screenshot of the toolbox script parameter properties?

DanaNajeeb

I'm not sure I've done this correctly, but here's my script after adding MakeFeatureLayer and it gives the same behavior:

danretired

MakeFeatureLayer is used as a step in the process, It may not be being done in the webapp environment

DanaNajeeb

Thank you for your response. That makes sense, I changed it to Point1 and it still works. It's just that I'm having the same problem still.

danretired

Just a thought. Since delete features will do this to features that are selected, shouldn't you be deleting them from Point1 in your last line rather than the layer "selected_points".

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