[GIS] How to detect relationship classes in a file GDB

arcgis-10.0arcobjectsarcpyrelationship-class

I would like to be able to detect relationship classes in a file GDB. Because users of my script might have only an ArcView level license, they would not be able to manipulate the schema of a feature class (specifically to add a field) that is in a workspace that has relationship classes. How do I detect the presence of relationship classes, so that I can document them, avoid them programatically, and allow the script to continue?

Best Answer

The relationshipClassNames property is supposed to do this but it does not seem to work for me (tested in a file geodatabase, created relationship class between two feature classes, checked the property, the list returned is empty for both). Maybe it will work for you.

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[GIS] ArcGIS License – ArcInfo level license set during python script execution vs via Desktop Administrator

Check this help file out.
Accessing Licenses and extensions in Python

The CheckProduct(code) and SetProduct(code) methods look like they will provide you with the tools you're looking for.

[GIS] Creating empty feature class in file geodatabase based on schema of ArcSDE feature class

Just use the CreateFeatureClass tool, passing the original feature class as the template argument. Grab the shape type from the Describe object of the input feature class.

Unlike the other answer, this won't copy a bunch of unnecessary records only to delete them right away.

import arcpy
arcpy.env.workspace= 'MyGDB.gdb'
fcs = arcpy.ListFeatureClasses()
output = "OutGDB.gdb"
for fc in fcs:
    geom = arcpy.Describe(fc).shapeType
    arcpy.CreateFeatureclass_management(output, fc, geom, fc, spatial_reference=fc)

UPDATE:

If you need to preserve domains/subtypes, then run Select_analysis using a generic where clause that will capture none of the records, like OBJECTID < 0:

import os, arcpy
arcpy.env.workspace= 'MyGDB.gdb'
fcs = arcpy.ListFeatureClasses()
output = "OutGDB.gdb"
wc = 'OBJECTID < 0'
for fc in fcs:
    fc_out = os.path.join(output, fc)
    arcpy.Select_analysis(fc, fc_out, wc)

This is far more efficient than copying all the records and then deleting them. I've yet to find an approach that will preserve editor tracking.

Best Answer

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[GIS] Creating empty feature class in file geodatabase based on schema of ArcSDE feature class

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