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Unable to change data source path for group layer file

jayshukla

Hi There,
I am having some difficulty changing the data source for a grooup layer. Below is the code that i am using. It processes LYR file successfully that has single data source but if LYR file has more than one data layers, it doesn't do it. Appreciate any feedback.

Thanks
Jay

import arcpy, datetime, os, io, sys

try:

    #Read input parameters from GP dialog


    # Prod Setting...
    folderPath = arcpy.GetParameterAsText(0)
    output = arcpy.GetParameterAsText(1)
    sourceString = r"P:\Temp" #
    replacmentString = r"Z:\Temp" #

    #Create an output file
    outFile = open(output, "w")

    #Loop through each "LYR" file
    count = 0
    for path, dires, files in os.walk(folderPath):
        #for filename in os.listdir(folderPath):
        for filename in files:
            #fullpath = os.path.join(folderPath, filename)
            fullpath = os.path.join(path, filename)

            if os.path.isfile(fullpath):
                if filename.lower().endswith(".lyr"):
                    groupLayerName = ""
                    #Reference LYR
                    layerFile = arcpy.mapping.Layer(fullpath)

                    #Reference each layer in a layer file
                    count = 1
                    for lyr in arcpy.mapping.ListLayers(layerFile):
                        if lyr.isGroupLayer:
                            groupLayerName = lyr.name

                        if lyr.supports("DATASOURCE"):
                            dataSourceOrig = str(lyr.dataSource)
                            if dataSourceOrig.find(sourceString) >= 0:

                                dataSourceNew = dataSourceOrig.replace(sourceString, replacmentString)

                                if groupLayerName:
                                    outFile.write(fullpath + "\t" + groupLayerName + "\t" +lyr.name + "\t" + dataSourceOrig + "\t" + dataSourceNew + "\t" + "GROUP LAYER SOURCE" "\n")
                                    lyr.findAndReplaceWorkspacePath(sourceString, replacmentString, True)
                                    lyr.save()
                                else:
                                    outFile.write(fullpath + "\t" + "Non Group Layer" + "\t" + lyr.name + "\t" + dataSourceOrig + "\t" + dataSourceNew + "\t" + "SINGLE LAYER SOURCE" "\n")
                                    lyr.findAndReplaceWorkspacePath(sourceString, replacmentString, True)
                                    lyr.save()
                    del layerFile

    outFile.close()

    #Open the resulting text file
    os.startfile(output)

    #Delete variables that reference data on disk
    del outFile

except Exception, e:
import traceback
map(arcpy.AddError, traceback.format_exc().split("\n"))
arcpy.AddError(str(e))

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Accepted answers

gpnobbir

Group Layer does not have any path - so you cannot change its path. Whenever, you encounter a group layer, skip it as in this code snippet:

if layer.isGroupLayer:     pass    # skip else:     #replace data path

It will be easier to read your code if you copy-paste them within CODE tags (click on the hash symbol to get tags).

There is a simple sample here:

import arcpy mxd = arcpy.mapping.MapDocument(r"C:\Project\Project.mxd") for lyr in arcpy.mapping.ListLayers(mxd):     if lyr.supports("DATASOURCE"):         if lyr.dataSource == r"C:\Project\Data\Parcels.gdb\MapIndex":             lyr.findAndReplaceWorkspacePath(r"Data", r"Data2") mxd.saveACopy(r"C:\Project\Project2.mxd") del mxd

Here is the topic:
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Updating_and_fixing_data_sources_with_arcpy_mapping/00s30000004p000000/

All comments

TrevorBurgan

This was just what I was looking for. Well commented too. Great work!

AnnStark2

I am publishing this example script even though the question is marked answered because as a novice python programmer I needed the full complete picture to help me understand what is happening. It's true that the issue above is that the group layer file cannot be treated as the individual layer files. The answers above addressed that issue - I just had a hard time understanding how to handle it differently. In this script, the group layer file is identified and then the layers inside it are handled as a new layer object.

This is the script I used to process a directory of folders and layer files numbering over 700 when we switched SDE servers.

The script fails on some things (it doesn't like representations, and a few other odd ducks) but it processed well over 90% just fine, and that was good enough for us. The remaining will be dealt with individually.

This script also incorporates logging which reports actions to the screen and to a log file, so that you have a record of what was processed and what failed. I then wrote another script which read the log file and pull out into a summary page what failed. That is optional obviously.

I do not take credit for coming up with this myself. I found another post at gis.stackexchange.com that got me quite far by Tim Barnes, also located here: replaceDataSource for layers within a group layer

The zip file attached contains the logging config file referenced in the script below. "Logging" is a standard python module.

#!/usr/bin/env python
#********************************************************************************************************************
# Name:              FixLayerFileSourcePaths.py
# Created:          3/10/2016 
# Version:          ArcGIS 10.4
# Author:            Ann Stark, City of Bellingham
# Modifications:   
# Dependencies:      logging config file
# Description:      Reads a directory and all sub directories, replacing the source data path for layer files.
#                    In the example below an SDE connection was being moved from one server to another server.
#                    Richmond
# Called by:       
# Arguments:        None
#*********************************************************************************************************************
# to use this script
# 1. copy this script and the logging config file to a location
# 2. modify the logging file config path to point to your config file.
# 3. modify the "sourceString" and "replacementString" variables to be the old and new paths you want to replace.
# 4. modify the "folder" variable to be the highest level folder that you want to search for .lyr files.  This script runs through the folder listed and all folders within it.
#*********************************************************************************************************************


import time
tic = time.clock()


import os, sys, string, logging
import arcpy
import arcpy.mapping
from arcpy import env


import logging
import logging.config


# Where is the logging config file.
logging.config.fileConfig(r"N:\scripts\arcgis\speedsongPathFixes\logging\logging.conf", disable_existing_loggers=False)  #modify this path to point to your config file.
logging.info('--> STARTED Script')


# Folder- the folder where you want to search for the layer files
folder = r"N:\LayerFiles_Speedsong\water utilities"  #directory to search for lyr files
logging.info('PROCESSING {}'.format(folder))
#folder = arcpy.GetParameterAsText(0)


sourceString = r"Richmond_" #oldpath
replacementString = r"Speedsong_" #newpath
logging.info("Replacing {} with {}".format(sourceString, replacementString))
for path, dirs, files in os.walk(folder): #walk through all sub folders
    logging.info(" Now processing {}".format(path))
    arcpy.env.workspace = path
    try:
        for layerFile in arcpy.ListFiles("*.lyr"):
            try:
                # find the actual layer files in the folder
                lyr = arcpy.mapping.Layer(path + "\\" + layerFile)
                # make layer object from layer file
                for lyrObj in arcpy.mapping.ListLayers(lyr):
                    try:
                        # a layer file may have multiple layers within it so work through those...
                        if lyr.isGroupLayer:
                            #logging.info(layerFile + " is a group layer.")
                            #arcpy.AddMessage(layerFile + " is a group layer.")
                            #arcpy.AddMessage(lyrObj.longName +":"+ lyrObj.name)
                            if lyrObj.name.find('Build') >= 0:
                                pass #this skips our buildings representation
                            elif lyrObj.longName !=str(lyr.name):
                                # just update the layers within the group layer
                                #arcpy.AddMessage(layerFile + " contains a layer object named: " + lyrObj.name)
                                logging.info(layerFile + " contains a layer object named: " + lyrObj.name)
                                newWS = lyrObj.workspacePath.replace(sourceString, replacementString)
                                newSource =lyrObj.dataSource.replace(sourceString, replacementString)
                                if arcpy.Exists(newSource):
                                    #arcpy.AddMessage("Updating " + lyrObj.name + " with replacement GDB.")
                                    #lyrObj.replaceDataSource(newWS, "FILEGDB_WORKSPACE")
                                    lyrObj.findAndReplaceWorkspacePath(sourceString, replacementString, True)
                                    lyr.save()
                                    logging.info("  Updated " + lyrObj.name)
                                else:
                                    logging.info(newSource + " DOES NOT exist. Will not update this layer.")
                        elif lyr.isGroupLayer == 0:
                            newWS = lyr.workspacePath.replace(sourceString, replacementString)
                            newSource = lyr.dataSource.replace(sourceString, replacementString)
                            if arcpy.Exists(newSource):
                                logging.info("Updating {} with replacement source path.".format(lyr.name))
                                #lyr.replaceDataSource (newWS, "FILEGDB_WORKSPACE") #use this when changing source types (shp to fgdb for example.)
                                lyrObj.findAndReplaceWorkspacePath(sourceString, replacementString, True)
                                lyr.save()
                            else:
                                logging.info(newSource + " DOES NOT exist. Will not update this layer.")
                    except Exception as e:
                        logging.error(str(e))
            except Exception as e:
                logging.error(str(e))
    except Exception as e:
        import traceback
        map(arcpy.AddError, traceback.format_exc().split("\n"))
        arcpy.AddError(str(e))
        logging.error(str(e))




del arcpy, os, sys, lyr
logging.info("--> FINISHED script")
toc = time.clock()
ElapsedTime = round((toc - tic)/60, 2)
logging.info("    ElapsedTime is {0} minutes\n\n".format(ElapsedTime))
# uncomment the last two lines if you want to open the log file automatically after the script runs.
# change the path to your log file.
#import webbrowser
#webbrowser.open(r"c:\your\path\to\the\SpeedsongPathFix.log")

FixlayerFileSourcePaths.zip

User35489

Thanks Ciaran, i tried your suggestion

As soon as it hits Group Layer, it prints below and exits.

MainLayer.lyr is a group layer

"Layer1" is a layer inside MainLayer.lyr

name: Layer1

long name: Layer1

Layer1 is a single layer

Error: Layer: Unexpected error

ciarandoyle1

i am pretty sure you are getting that error because you are trying to save layer when in fact the object you have at the point is not a layer - but is in fact a layer within a group layer. You need to be saving the group layer

the below change might work.........

#This comparison test for layers in a group layer vs those not in. The .longName property includes all group layers as part of path
        if singlelayer.name != singlelayer.longName:
          outputFile.write(pathfull + "\t" + singlelayer.longName + "\t" + singlelayer.name + "\t" + dataSourceOrig + "\t" + dataSourceNew + "\t" + "GROUP LAYER SOURCE" "\n")
          singlelayer.findAndReplaceWorkspacePath(sourceString, replacementString, True)
          print "%s group source changed" % singlelayer
          #singlelayer.save()

layer.save()
print "%s saved" % singlelayer

AnnStark2

I am having the same issue. Is this a new bug that a previously working script now fails?

ericmeyers_cob

I'm having the exact same issues and cannot figure out why I keep getting the error 'no filename set'. It is discouraging that ESRI would allow you to create group .lyr files but not allow you to modify them the same way.

JeffThomas

I am also attempting to re-source a bunch of layer files, some of which are group layers, in a folder. I started with the same script found above, which the OP also posted to GIS Stack Exchange and someone there added a recursive function to parse through nested group layers. Seemed like the perfect solution. Except the script errors out as soon as it hits a group layer. More specifically: as soon as it tries to save the first layer within a group layer, it returns an error: "No filename set". I believe this is because the .name and .longName attributes of the layer variable are the same even though they shouldn't be if the layer is inside a group layer. Thus, the conditional statement on line 27 (if singlelayer.name != singlelayer.longName:) is never met and all layers move on to "else". Something in this script is causing .name and .longName to become identical because they are just fine if I check for them in a separate, simpler script. I am using ArcGIS 10.2, but I believe the original script was written for 10.0. Any ideas what could be causing this?

import arcpy, datetime, os, io, sys  def walknestedgroups(layerlist,srcString,repString,pathfull,outputFile):   if layerlist.isGroupLayer:     #Cycle through grouplayer     print "%s is a group layer" % layerlist          for layer in layerlist:       print "%s is a layer inside %s" % (layer,layerlist)       print "name: " + layer.name       print "long name: " + layer.longName       #This will continue to cycle through and test for group layers       walknestedgroups(layer,srcString,repString,pathfull,outputFile)    else:      print "%s is a single layer" % layerlist           #Once a non-group layer is returned, head through the rest of original script     singlelayer = layerlist     if singlelayer.supports("DATASOURCE"):       dataSourceOrig = str(singlelayer.dataSource)       if dataSourceOrig.find(srcString) >= 0:         dataSourceNew = dataSourceOrig.replace(srcString, repString)          #This comparison test for layers in a group layer vs those not in.  The .longName property includes all group layers as part of path         if singlelayer.name != singlelayer.longName:           outputFile.write(pathfull + "\t" + singlelayer.longName + "\t" + singlelayer.name + "\t" + dataSourceOrig + "\t" + dataSourceNew + "\t" + "GROUP LAYER SOURCE" "\n")           singlelayer.findAndReplaceWorkspacePath(sourceString, replacementString, True)           print "%s group source changed" % singlelayer           singlelayer.save()           print "%s saved" % singlelayer          else:           outputFile.write(pathfull + "\t" + "Non Group Layer" + "\t" + singlelayer.longName + "\t" + dataSourceOrig + "\t" + dataSourceNew + "\t" + "SINGLE LAYER SOURCE" "\n")           singlelayer.findAndReplaceWorkspacePath(srcString, repString, True)           print "%s source changed" % singlelayer            singlelayer.save()           print "%s saved" % singlelayer      return layerlist     print "loop exited for " + layerlist + " group layer"   try:      #Read input parameters from GP dialog    # Prod Setting...   folderPath = r"G:\JThomas\LayerFiles\Vector\REAL_PROPERTY"   output = r"G:\JThomas\LayerFiles\logfile.log"   sourceString = ""    replacementString = r"P:\LE\Connections\LE_CAC @ CLJN.sde"    #Create an output file   outFile = open(output, "w")    #Loop through each "LYR" file   count = 0   for path, dires, files in os.walk(folderPath):     # for filename in os.listdir(folderPath):     for filename in files:       # fullpath = os.path.join(folderPath, filename)       fullpath = os.path.join(path, filename)        if os.path.isfile(fullpath):                if filename.lower().endswith(".lyr"):           groupLayerName = ""           #Reference LYR           layerFile = arcpy.mapping.Layer(fullpath)            #Iterate through layer list and all group layers.  Return single layer            for totallayer in arcpy.mapping.ListLayers(layerFile):             #This function will take each layer in the .lyr file, cycle through any group layers then apply path changes to individual layers             singlelayer = walknestedgroups(totallayer,sourceString,replacementString,fullpath,outFile)           del layerFile    outFile.close()    #Open the resulting text file   os.startfile(output)    #Delete variables that reference data on disk   del outFile  except Exception, e:   import traceback   map(arcpy.AddError, traceback.format_exc().split("\n"))   arcpy.AddError(str(e))   print "Error: %s" % e

Edit: not sure what the deal is with the code block. It looked fine in the preview and now it's all one line. I've attached it as a separate file. Sorry for any inconvenience viewing it!

ResourceGroupLayers.py.zip

WaiChan1

That was it!! I was scratching my head for a couple of weeks figuring out how to do nested group layers in Python. I can't believe it was this simple. Thank you again!

gpnobbir

Have you checked both layer.isGroupLayer and layer.supports("DATASOURCE")? See my code below:

import arcpy

try:
    mxd = arcpy.mapping.MapDocument(r"C:\test\mymap.mxd")
    layers = arcpy.mapping.ListLayers(mxd)

    for layer in layers:
        if not layer.isGroupLayer:
            if layer.supports("DATASOURCE"):
                print layer.dataSource

except:
    print "Exception ...."

WaiChan1

Thank you for the response. I am also using ArcGIS 10.0 SP 5.

For a one-level group layer, I can cycle through each individual layer and repoint the data source. My problem comes when it gets to a nested group layer. For any sub-group layers within a group layer, the script does not support any datasource.

Here is my short script:

import arcpy
lyr = arcpy.mapping.Layer(r"C:\Temp\Group1.lyr") #Nested group layer file
for layer in lyr:
    print layer.dataSource

And here is the error that follows the execution. The error appears when it hits the sub-group layer within the group layer.

Traceback (most recent call last):
  File "<interactive input>", line 2, in <module>
  File "C:\Program Files (x86)\ArcGIS\Desktop10.0\arcpy\arcpy\arcobjects\_base.py", line 70, in _get
    return convertArcObjectToPythonObject(getattr(self._arc_object, attr_name))
AttributeError: LayerObject: Get attribute dataSource does not exist

gpnobbir

I've just tested on 10.0 SP5 and cannot reproduce the issue. Which version of ArcGIS you are using? Can you post your code? Don't forget to use code block (click on # sign above).

Have you tested this line?

if lyr.supports("DATASOURCE"):

WaiChan1

I am running into the same problem - not in ArcMap, but in ArcCatalog. I am trying to change the data sources of layer files systematically in a folder in ArcCatalog. The python script runs fine except when it hits a group layer file.

The script can read the group layer, recognizes it is a group layer, loop through the group layer to access each individual layer. However, the individual layers within the group layer do not support "dataSource" or "datasetName" properties. And therefore, I cannot change the data sources of these group layers.

I couldn't seem to find much documentation on this issue. Does anyone else encounter the same problem and can offer some suggestions? Thank you!

gpnobbir

Group Layer does not have any path - so you cannot change its path. Whenever, you encounter a group layer, skip it as in this code snippet:

if layer.isGroupLayer:     pass    # skip else:     #replace data path

It will be easier to read your code if you copy-paste them within CODE tags (click on the hash symbol to get tags).

There is a simple sample here:

import arcpy mxd = arcpy.mapping.MapDocument(r"C:\Project\Project.mxd") for lyr in arcpy.mapping.ListLayers(mxd):     if lyr.supports("DATASOURCE"):         if lyr.dataSource == r"C:\Project\Data\Parcels.gdb\MapIndex":             lyr.findAndReplaceWorkspacePath(r"Data", r"Data2") mxd.saveACopy(r"C:\Project\Project2.mxd") del mxd

Here is the topic:
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#/Updating_and_fixing_data_sources_with_arcpy_mapping/00s30000004p000000/

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