Test Pluck

finisher_api.go

@@ -273,6 +273,7 @@ func (db *DB) Scan(dest interface{}) (tx *DB) {
 //     db.Find(&users).Pluck("age", &ages)
 func (db *DB) Pluck(column string, dest interface{}) (tx *DB) {
 	tx = db.getInstance()
+	tx.Statement.AddClause(clause.Select{Columns: []clause.Column{{Name: column}}})
 	tx.Statement.Dest = dest
 	tx.callbacks.Query().Execute(tx)
 	return

scan.go

@@ -58,7 +58,12 @@ func Scan(rows *sql.Rows, db *DB, initialized bool) {
 	default:
 		switch db.Statement.ReflectValue.Kind() {
 		case reflect.Slice, reflect.Array:
-			isPtr := db.Statement.ReflectValue.Type().Elem().Kind() == reflect.Ptr
+			reflectValueType := db.Statement.ReflectValue.Type().Elem()
+			isPtr := reflectValueType.Kind() == reflect.Ptr
+			if isPtr {
+				reflectValueType = reflectValueType.Elem()
+			}
+
 			db.Statement.ReflectValue.Set(reflect.MakeSlice(db.Statement.ReflectValue.Type(), 0, 0))
 			fields := make([]*schema.Field, len(columns))
 			joinFields := make([][2]*schema.Field, len(columns))
@@ -81,7 +86,11 @@ func Scan(rows *sql.Rows, db *DB, initialized bool) {
 
 			for initialized || rows.Next() {
 				initialized = false
-				elem := reflect.New(db.Statement.Schema.ModelType).Elem()
+				elem := reflect.New(reflectValueType).Elem()
+
+				if reflectValueType.Kind() != reflect.Struct && len(fields) == 1 {
+					values[0] = elem.Addr().Interface()
+				} else {
 					for idx, field := range fields {
 						if field != nil {
 							values[idx] = field.ReflectValueOf(elem).Addr().Interface()
@@ -94,6 +103,7 @@ func Scan(rows *sql.Rows, db *DB, initialized bool) {
 							values[idx] = joinFields[idx][1].ReflectValueOf(relValue).Addr().Interface()
 						}
 					}
+				}
 
 				db.RowsAffected++
 				db.AddError(rows.Scan(values...))

tests/query_test.go

@@ -80,3 +80,35 @@ func TestFind(t *testing.T) {
 		}
 	}
 }
+
+func TestPluck(t *testing.T) {
+	users := []*User{
+		GetUser("pluck-user1", Config{}),
+		GetUser("pluck-user2", Config{}),
+		GetUser("pluck-user3", Config{}),
+	}
+
+	DB.Create(&users)
+
+	var names []string
+	if err := DB.Model(User{}).Where("name like ?", "pluck-user%").Order("name").Pluck("name", &names).Error; err != nil {
+		t.Errorf("Raise error when pluck name, got %v", err)
+	}
+
+	var ids []int
+	if err := DB.Model(User{}).Where("name like ?", "pluck-user%").Order("name").Pluck("id", &ids).Error; err != nil {
+		t.Errorf("Raise error when pluck id, got %v", err)
+	}
+
+	for idx, name := range names {
+		if name != users[idx].Name {
+			t.Errorf("Unexpected result on pluck name, got %+v", names)
+		}
+	}
+
+	for idx, id := range ids {
+		if int(id) != int(users[idx].ID) {
+			t.Errorf("Unexpected result on pluck id, got %+v", ids)
+		}
+	}
+}