topic Re: arcpy.replaceDataSource in an mxd in Python Questions

arcpy.replaceDataSource in an mxd

JohnMcGlynn — Mon, 15 Feb 2021 02:14:56 GMT

I have an mxd file with about 80 layers. Each layer has to be updated with a standard symbology and labeling. If I use the arcpy.ApplySymbologyFromLayer_management it only updates the symbology. I want to up update everything.

When I use the arcpy.mapping.UpdateLayer function it does exactly what I want. However it changes the layer name and the data source. I'm trying to run UpdateLayer and then change the name and datasource back.

Unfortunately when I run Layer.replaceDataSource for a layer it changes all the layers in the map.

This code is posted raw because I can't find the Code tag....

import arcpy, os

mxd = arcpy.mapping.MapDocument("CURRENT")
df = arcpy.mapping.ListDataFrames(mxd,"Layers")[0]
layers = arcpy.mapping.ListLayers(mxd)
# Master featureclass names
PolylineMaster = 'PolylineMaster'
PointMaster = 'PointMaster'
PolygonMaster = 'PolygonMaster'
# Run each of point, polyline or polygon
doPoint = False
doPolyline = True
doPolygon = False

if doPoint == True:
lyrPtMaster = arcpy.mapping.ListLayers(mxd,PointMaster,df)[0]

if doPolyline == True:
lyrLineMaster = arcpy.mapping.ListLayers(mxd,PolylineMaster,df)[0]

if doPolygon == True:
lyrPolyMaster = arcpy.mapping.ListLayers(mxd,PolygonMaster,df)[0]

for lyr in layers:
lyrName = lyr.name

if lyrName == PolylineMaster or lyrName == PointMaster or lyrName == PolygonMaster:
continue
else:
print(lyrName)
desc = arcpy.Describe(lyr)
#path = arcpy.Describe(lyr).catalogPath # Full path - doesn't work

path = arcpy.Describe(lyr).path # GDB path
print(path)
if desc.shapeType == "Point" and doPoint == True:
arcpy.mapping.UpdateLayer(df,lyr,lyrPtMaster,False)
elif desc.shapeType == "Polyline" and doPolyline == True:
arcpy.mapping.UpdateLayer(df,lyr,lyrLineMaster,False)
elif desc.shapeType == "Polygon" and doPolygon == True:
arcpy.mapping.UpdateLayer(df,lyr,lyrPolyMaster,False)

# Reset the data source and the layer name - both of which have been changed to the Master
lyr.replaceDataSource(path,'FILEGDB_WORKSPACE',lyrName,True)
print(lyrName)
lyr.name = lyrName
print(lyr.name)
arcpy.RefreshActiveView()
arcpy.RefreshTOC()
del mxd

I am using ArcGIS 10.6

Can replaceDataSource be used to replace just one layer's data source?

Re: arcpy.replaceDataSource in an mxd

DanPatterson — Mon, 15 Feb 2021 03:17:40 GMT

~~Would it be possible for you to format your code to make it easier and to check for syntax errors.~~

Just saw the plea for code guidance.... here you have it... expand the . . . as in the link

Code formatting ... the Community Version - GeoNet, The Esri Community

Re: arcpy.replaceDataSource in an mxd

JohnMcGlynn — Tue, 16 Feb 2021 22:51:30 GMT

Thanks Dan. This looks much better.

import arcpy, os mxd = arcpy.mapping.MapDocument("CURRENT") df = arcpy.mapping.ListDataFrames(mxd,"Layers")[0] layers = arcpy.mapping.ListLayers(mxd) # Master featureclass names PolylineMaster = 'PolylineMaster' PointMaster = 'PointMaster' PolygonMaster = 'PolygonMaster' # Run each of point, polyline or polygon doPoint = False doPolyline = True doPolygon = False if doPoint == True: lyrPtMaster = arcpy.mapping.ListLayers(mxd,PointMaster,df)[0] if doPolyline == True: lyrLineMaster = arcpy.mapping.ListLayers(mxd,PolylineMaster,df)[0] if doPolygon == True: lyrPolyMaster = arcpy.mapping.ListLayers(mxd,PolygonMaster,df)[0] for lyr in layers: lyrName = lyr.name if lyrName == PolylineMaster or lyrName == PointMaster or lyrName == PolygonMaster: continue else: print(lyrName) desc = arcpy.Describe(lyr) path = arcpy.Describe(lyr).catalogPath print(path) if desc.shapeType == "Point" and doPoint == True: arcpy.mapping.UpdateLayer(df,lyr,lyrPtMaster,False) elif desc.shapeType == "Polyline" and doPolyline == True: arcpy.mapping.UpdateLayer(df,lyr,lyrLineMaster,False) elif desc.shapeType == "Polygon" and doPolygon == True: arcpy.mapping.UpdateLayer(df,lyr,lyrPolyMaster,False) # Reset the data source and the layer name - both of which have been changed to the Master lyr.replaceDataSource(path,'FILEGDB_WORKSPACE',lyrName,True) print(lyrName) lyr.name = lyrName print(lyr.name) arcpy.RefreshActiveView() arcpy.RefreshTOC() del mxd

Re: arcpy.replaceDataSource in an mxd

Anonymous User — Sat, 20 Feb 2021 18:24:41 GMT

I noticed in the examples they are saving the updated mxds as a copy. Have you tried doing that and seeing if things are persisted?

I vaguely remember fixing some broken datasources in mxds a few years ago. I can try to find the script and share it with you for some ideas but I think replaceDataSource didn't work and I ended up just replacing the layers path to make it stick.