How to create a route and add that route as layer to map using ArcPy?

Question

I wrote a little script for ArcGis, and when I make it run by GUI it happens that it seems to create routes but the routes do not appear in the TOC. Consequently, when the script tries to execute operation on those routes, the dataset cannot be found.

How can I solve this issue?

Thanks in advance, Annalisa

Answer 1

I just tested the code below which seemed to work when I placed it behind a tool with no parameters.

arcpy.CreateRoutes_lr("C:/temp/test.gdb/Streets","STREET","C:/temp/test.gdb/StreetRoutes","LENGTH","#","#","UPPER_LEFT","1","0","IGNORE","INDEX")

mxd = arcpy.mapping.MapDocument("CURRENT")
df = arcpy.mapping.ListDataFrames(mxd)[0]
arcpy.MakeFeatureLayer_management("C:/temp/test.gdb/StreetRoutes", "route_lyr")
arcpy.SaveToLayerFile_management("route_lyr", "C:/temp/StreetRoutes.lyr")
addLayer = arcpy.mapping.Layer("C:/temp/StreetRoutes.lyr")
arcpy.mapping.AddLayer(df, addLayer)

MakeRouteEventLayer is for placing line and point events along routes so is not used as part of simply drawing the route.

Answer 2

You can do it with ArcPy.mapping:

# Project variables
arcpy.env.workspace = "[Your working directory]"
mapTemplate = "ModelDepDM.mxd"
lyrZones = "__Zone500_Rabat_DM"

# Mxd and dataframe
mxd = arcpy.mapping.MapDocument(os.path.join(arcpy.env.workspace, mapTemplate))
df = arcpy.mapping.ListDataFrames(mxd)[0]

# What I'd like to add
newSource = os.path.join(arcpy.env.workspace, lyrZones[0:-3] + _dirNum + ".shp")
result = arcpy.MakeFeatureLayer_management(newSource, lyrZones)

# Adding the result to the TOC
layer2 = result.getOutput(0)
arcpy.mapping.AddLayer(df, layer2, 'AUTO_ARRANGE')

You need to make a feature layer from your result and add it to a dataframe.

Maybe there's another way to do it, but it works for me...