Add prefix support

main.go

@@ -414,6 +414,12 @@ func (s *DB) Table(name string) *DB {
 	return clone
 }
 
+func (s *DB) Prefix(name string) *DB {
+	clone := s.clone()
+	clone.search.Prefix(name)
+	return clone
+}
+
 // Debug start debug mode
 func (s *DB) Debug() *DB {
 	return s.clone().LogMode(true)

main_test.go

@@ -247,7 +247,19 @@ func TestTableName(t *testing.T) {
 	if DB.NewScope([]Cart{}).TableName() != "shopping_cart" {
 		t.Errorf("[]Cart's singular table name should be shopping_cart")
 	}
+
+	// Test prefix
+	if DB.Prefix("my_prefix_").NewScope(Order{}).TableName() != "my_prefix_order" {
+		t.Errorf("Order's table name should be my_prefix_order")
+	}
+
 	DB.SingularTable(false)
+
+	// Test prefix
+	if DB.Prefix("my_prefix_").NewScope(Order{}).TableName() != "my_prefix_orders" {
+		t.Errorf("Order's table name should be my_prefix_orders")
+	}
+
 }
 
 func TestNullValues(t *testing.T) {

scope.go

@@ -301,17 +301,29 @@ type dbTabler interface {
 // TableName return table name
 func (scope *Scope) TableName() string {
 	if scope.Search != nil && len(scope.Search.tableName) > 0 {
-		return scope.Search.tableName
+		return scope.Search.prefix + scope.Search.tableName
 	}
 
 	if tabler, ok := scope.Value.(tabler); ok {
+		if scope.Search != nil {
+			return scope.Search.prefix + tabler.TableName()
+		}
+
 		return tabler.TableName()
 	}
 
 	if tabler, ok := scope.Value.(dbTabler); ok {
+		if scope.Search != nil {
+			return scope.Search.prefix + tabler.TableName(scope.db)
+		}
+
 		return tabler.TableName(scope.db)
 	}
 
+	if scope.Search != nil {
+		return scope.Search.prefix + scope.GetModelStruct().TableName(scope.db.Model(scope.Value))
+	}
+
 	return scope.GetModelStruct().TableName(scope.db.Model(scope.Value))
 }
 
@@ -319,9 +331,9 @@ func (scope *Scope) TableName() string {
 func (scope *Scope) QuotedTableName() (name string) {
 	if scope.Search != nil && len(scope.Search.tableName) > 0 {
 		if strings.Index(scope.Search.tableName, " ") != -1 {
-			return scope.Search.tableName
+			return scope.Search.prefix + scope.Search.tableName
 		}
-		return scope.Quote(scope.Search.tableName)
+		return scope.Quote(scope.Search.prefix + scope.Search.tableName)
 	}
 
 	return scope.Quote(scope.TableName())

search.go

@@ -19,6 +19,7 @@ type search struct {
 	limit            interface{}
 	group            string
 	tableName        string
+	prefix           string
 	raw              bool
 	Unscoped         bool
 	countingQuery    bool
@@ -132,6 +133,11 @@ func (s *search) Table(name string) *search {
 	return s
 }
 
+func (s *search) Prefix(name string) *search {
+	s.prefix = name
+	return s
+}
+
 func (s *search) getInterfaceAsSQL(value interface{}) (str string) {
 	switch value.(type) {
 	case string, int, int8, int16, int32, int64, uint, uint8, uint16, uint32, uint64: