Bug
When using the Merge tool in ArcPy, the field mappings are not honored.
| Bug ID Number | BUG-000171352 |
|---|---|
| Submitted | October 9, 2024 |
| Last Modified | June 21, 2025 |
| Applies to | ArcGIS Pro |
| Version found | 3.3.1 |
| Operating System | Windows OS |
| Operating System Version | 10.0 64 Bit |
| Version Fixed | 3.5 |
| Status | Fixed |
Additional Information
This issue is addressed in ArcGIS Pro 3.5.Workaround
In the Python notebook script, change the call to the Merge tool from arcpy.Merge_management([st_class, rc], merge_path, f_Mappings) to arcpy.Merge_management([st_class, rc], merge_path, f_Mappings.exportToString()). This uses the string version of the FieldMappings object as input to the Merge tool instead of the arcpy.FieldMappings() object and produce the expected output.
Steps to Reproduce
Bug ID: BUG-000171352
Software:
- ArcGIS Pro
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