Add Pluck

model.go

@@ -35,7 +35,12 @@ func (m *Model) PrimaryKeyValue() int64 {
 		return 0
 	default:
 		result := reflect.ValueOf(m.Data).Elem()
-		return result.FieldByName(m.PrimaryKey()).Interface().(int64)
+		value := result.FieldByName(m.PrimaryKey())
+		if value.IsValid() {
+			return result.FieldByName(m.PrimaryKey()).Interface().(int64)
+		} else {
+			return 0
+		}
 	}
 }
 

orm.go

@@ -128,8 +128,8 @@ func (s *Orm) Find(out interface{}) *Orm {
 }
 
 func (s *Orm) Pluck(column string, value interface{}) (orm *Orm) {
-	s.explain(s.model, "Query").query(value)
-	return
+	s.Select(column).explain(s.model.Data, "Query").pluck(value)
+	return s
 }
 
 func (s *Orm) Or(querystring interface{}, args ...interface{}) *Orm {

orm_test.go

@@ -226,6 +226,7 @@ func TestComplexWhere(t *testing.T) {
 }
 
 func TestOrder(t *testing.T) {
-	// var ages []int64
-	// db.Model(&User).Order("age desc").Pluck("age", &ages)
+	var ages []int64
+	db.Model(&[]User{}).Order("age desc").Pluck("age", &ages)
+	debug(ages)
 }

sql.go

@@ -9,6 +9,7 @@ import (
 
 func (s *Orm) explain(value interface{}, operation string) *Orm {
 	s.Model(value)
+
 	switch operation {
 	case "Create":
 		s.createSql(value)
@@ -43,6 +44,7 @@ func (s *Orm) query(out interface{}) {
 
 	rows, err := s.db.Query(s.Sql, s.SqlVars...)
 	defer rows.Close()
+
 	s.Error = err
 	if rows.Err() != nil {
 		s.Error = rows.Err()
@@ -75,6 +77,22 @@ func (s *Orm) query(out interface{}) {
 	}
 }
 
+func (s *Orm) pluck(value interface{}) {
+	dest_out := reflect.Indirect(reflect.ValueOf(value))
+	dest_type := dest_out.Type().Elem()
+
+	rows, err := s.db.Query(s.Sql, s.SqlVars...)
+	s.Error = err
+
+	defer rows.Close()
+	for rows.Next() {
+		dest := reflect.New(dest_type).Elem()
+		s.Error = rows.Scan(dest)
+		dest_out.Set(reflect.Append(dest_out, dest))
+	}
+	return
+}
+
 func (s *Orm) createSql(value interface{}) {
 	columns, values := s.model.ColumnsAndValues()