Fixes service_categories response to POST API

CHANGELOG.md

@@ -47,6 +47,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 - [#7366](https://github.com/apache/trafficcontrol/pull/7366) *t3c* Removed timestamp from metadata file since it's changing every minute and causing excessive commits to git repo.
 
 ### Fixed
+- [#7130](https://github.com/apache/trafficcontrol/issues/7130) *Traffic Ops* Fixes service_categories response to POST API.
 - [#7340](https://github.com/apache/trafficcontrol/pull/7340) *Traffic Router* Fixed TR logging for the `cqhv` field when absent.
 - [#5557](https://github.com/apache/trafficcontrol/issues/5557) *Traffic Portal* Moved `Fair Queueing Pacing Rate Bps` DS field to `Cache Configuration Settings` section.
 - [#7252](https://github.com/apache/trafficcontrol/issues/7252) *Traffic Router* Fixed integer overflow for `czCount`, by resetting the count to max value when it overflows.

traffic_ops/traffic_ops_golang/api/generic_crud.go

@@ -119,19 +119,36 @@ func GenericCreateNameBasedID(val GenericCreator) (error, error, int) {
 	}
 	defer resultRows.Close()
 
+	var name string
 	lastUpdated := tc.TimeNoMod{}
 	rowsAffected := 0
+
 	for resultRows.Next() {
 		rowsAffected++
-		if err := resultRows.Scan(&lastUpdated); err != nil {
+		// Only when the type is of serviceCategory, &name is scanned and returned from the DB.
+		// Else return only &lastUpdated.
+		var err error
+		if val.GetType() == "serviceCategory" {
+			err = resultRows.Scan(&name, &lastUpdated)
+		} else {
+			err = resultRows.Scan(&lastUpdated)
+		}
+		if err != nil {
 			return nil, errors.New(val.GetType() + " create scanning: " + err.Error()), http.StatusInternalServerError
 		}
 	}
+
 	if rowsAffected == 0 {
 		return nil, errors.New(val.GetType() + " create: no " + val.GetType() + " was inserted, no row was returned"), http.StatusInternalServerError
 	} else if rowsAffected > 1 {
 		return nil, errors.New("too many rows returned from " + val.GetType() + " insert"), http.StatusInternalServerError
 	}
+
+	// Only when the type is of serviceCategory, setKeys to return name parameter.
+	if val.GetType() == "serviceCategory" {
+		val.SetKeys(map[string]interface{}{"name": name})
+	}
+
 	val.SetLastUpdated(lastUpdated)
 	return nil, nil, http.StatusOK
 }

traffic_ops/traffic_ops_golang/servicecategory/servicecategories.go

@@ -100,7 +100,7 @@ func (serviceCategory TOServiceCategory) Validate() (error, error) {
 }
 
 func (serviceCategory *TOServiceCategory) Create() (error, error, int) {
-	return api.GenericCreate(serviceCategory)
+	return api.GenericCreateNameBasedID(serviceCategory)
 }
 
 func (serviceCategory *TOServiceCategory) Read(h http.Header, useIMS bool) ([]interface{}, error, error, int, *time.Time) {