Add GetSliceValues to help clean up eager loads

boil/reflect.go

@@ -249,7 +249,7 @@ func GetStructValues(obj interface{}, columns ...string) []interface{} {
 	for i, c := range columns {
 		field := val.FieldByName(strmangle.TitleCase(c))
 		if !field.IsValid() {
-			panic(fmt.Sprintf("Unable to find field with name: %s\n%#v", strmangle.TitleCase(c), obj))
+			panic(fmt.Sprintf("unable to find field with name: %s\n%#v", strmangle.TitleCase(c), obj))
 		}
 		ret[i] = field.Interface()
 	}
@@ -257,6 +257,24 @@ func GetStructValues(obj interface{}, columns ...string) []interface{} {
 	return ret
 }
 
+// GetSliceValues returns the values (as interface) of the matching columns in obj.
+func GetSliceValues(slice []interface{}, columns ...string) []interface{} {
+	ret := make([]interface{}, len(slice)*len(columns))
+
+	for i, obj := range slice {
+		val := reflect.Indirect(reflect.ValueOf(obj))
+		for j, c := range columns {
+			field := val.FieldByName(strmangle.TitleCase(c))
+			if !field.IsValid() {
+				panic(fmt.Sprintf("unable to find field with name: %s\n%#v", strmangle.TitleCase(c), obj))
+			}
+			ret[i*len(columns)+j] = field.Interface()
+		}
+	}
+
+	return ret
+}
+
 // GetStructPointers returns a slice of pointers to the matching columns in obj
 func GetStructPointers(obj interface{}, columns ...string) []interface{} {
 	val := reflect.ValueOf(obj).Elem()

boil/reflect_test.go

@@ -352,6 +352,36 @@ func TestGetStructValues(t *testing.T) {
 	}
 }
 
+func TestGetSliceValues(t *testing.T) {
+	t.Parallel()
+
+	o := []struct {
+		ID   int
+		Name string
+	}{
+		{5, "a"},
+		{6, "b"},
+	}
+
+	in := make([]interface{}, len(o))
+	in[0] = o[0]
+	in[1] = o[1]
+
+	vals := GetSliceValues(in, "id", "name")
+	if got := vals[0].(int); got != 5 {
+		t.Error(got)
+	}
+	if got := vals[1].(string); got != "a" {
+		t.Error(got)
+	}
+	if got := vals[2].(int); got != 6 {
+		t.Error(got)
+	}
+	if got := vals[3].(string); got != "b" {
+		t.Error(got)
+	}
+}
+
 func TestGetStructPointers(t *testing.T) {
 	t.Parallel()