Latest Contributions by AndrewChapkowski

You cannot update the field names directly, you need to use a combination of update definition, add to definition and delete from definition to rename columns. Let's start with the update call.      update_def = { "fields": [ { "name": "THISisWrong", "type": "esriFieldTypeString", "alias": "AmazingAlias", "length": 256, "editable": True, "nullable": True, "defaultValue": None, "description": None, "domain": None, } ] } res = flyer.manager.update_definition(update_def) print(res)   This will update the alias column, though it doesn't directly answer your question.   Now how can we take say column: ThisIsWrong and Rename it to this_is_wrong? or something like that.  You'll have to do it in a few steps:    Add the new field Copy the column data If field is uneditable, make it uneditable drop the old field   import re from arcgis.gis import GIS from arcgis.features import FeatureLayer def _camelCase_to_underscore(name): """PEP8ify name""" if name[0].isdigit(): name = "execute_" + name name = name.replace(" ", "_") if '_' in name: return name.lower() s1 = re.sub('(.)([A-Z][a-z]+)', r'\1_\2', name) return re.sub('([a-z0-9])([A-Z])', r'\1_\2', s1).lower() if __name__ == "__main__": gis = GIS(profile='your_online_profile', verify_cert=False, trust_env=True) item = gis.content.get("e0d177f6b2ed4b1db1abe848dfea23f8") flyer = item.layers[0] # # Creating Columns with New Names # unchange_fields = [ v for k, v in dict(flyer.properties).items() if k in ['objectIdField', 'globalIdField'] ] rename_fields = [ dict(fld) for fld in flyer.properties.fields if fld["type"] not in ('esriFieldTypeOID', 'esriFieldTypeGlobalID') or fld['name'] not in (unchange_fields) ] expressions = [] delete_exp = {"fields": []} add_fields = [] uneditable = [] for idx, fld in enumerate(rename_fields): if _camelCase_to_underscore(fld["name"]) != fld["name"].lower(): expressions.append( { "field": _camelCase_to_underscore(fld["name"]), "sqlExpression": fld["name"], } ) delete_exp["fields"].append({"name": fld["name"]}) fld['name'] = _camelCase_to_underscore(fld["name"]) fld['alias'] = _camelCase_to_underscore(fld["alias"]) if fld['editable'] == False: uneditable.append(fld['name']) fld['editable'] = True add_fields.append(fld) else: print(f"Skipping field because it meets the format standards: {fld['name']}") print("Add the renamed columns") res = flyer.manager.add_to_definition({"fields": add_fields}) print(res) print("Update the column values") job = flyer.calculate(where="1=1", calc_expression=expressions, future=True) result = job.result() print(result) # Set fields that are not editable back to original state. # update_editable = [fld for fld in add_fields if fld['name'] in uneditable] if update_editable: for fld in update_editable: fld['editable'] = True update_def = {"fields": update_editable} res = flyer.manager.update_definition(update_def) print(res) # Drop the Old Fields # print(flyer.manager.delete_from_definition(delete_exp)) flyer._refresh() print([fld['name'] for fld in flyer.properties.fields])     It should be noted that this code doesn't handle cases.  If you have a field called Editor the caml casing should be editor.  The underlying database sees the field as the same name and thus can't be renamed.     ... View more