Remove unnecessary field

chain.go

@@ -9,11 +9,10 @@ import (
 )
 
 type Chain struct {
-	db                *sql.DB
-	driver            string
-	debug             bool
-	singularTableName bool
-	value             interface{}
+	db     *sql.DB
+	driver string
+	debug  bool
+	value  interface{}
 
 	Errors []error
 	Error  error
@@ -69,7 +68,6 @@ func (s *Chain) do(value interface{}) *Do {
 	do.limitStr = s.limitStr
 	do.specifiedTableName = s.specifiedTableName
 	do.unscoped = s.unscoped
-	do.singularTableName = s.singularTableName
 	do.debug = s.debug
 
 	s.value = value

do.go

@@ -37,13 +37,12 @@ type Do struct {
 	unscoped             bool
 	updateAttrs          map[string]interface{}
 	ignoreProtectedAttrs bool
-	singularTableName    bool
 }
 
 func (s *Do) tableName() string {
 	if s.specifiedTableName == "" {
 		var err error
-		s.guessedTableName, err = s.model.tableName(s.singularTableName)
+		s.guessedTableName, err = s.model.tableName()
 		s.err(err)
 		return s.guessedTableName
 	} else {

gorm_test.go

@@ -1218,27 +1218,29 @@ func TestTableName(t *testing.T) {
 	var table string
 
 	model := &Model{data: Order{}}
-	table, _ = model.tableName(false)
+	table, _ = model.tableName()
 	if table != "orders" {
 		t.Errorf("Order table name should be orders")
 	}
 
-	table, _ = model.tableName(true)
+	db.SingularTable(true)
+	table, _ = model.tableName()
 	if table != "order" {
 		t.Errorf("Order's singular table name should be order")
 	}
 
 	model2 := &Model{data: Cart{}}
-	table, _ = model2.tableName(false)
+	table, _ = model2.tableName()
 	if table != "shopping_cart" {
 		t.Errorf("Cart's singular table name should be shopping_cart")
 	}
 
 	model3 := &Model{data: &Cart{}}
-	table, _ = model3.tableName(false)
+	table, _ = model3.tableName()
 	if table != "shopping_cart" {
 		t.Errorf("Cart's singular table name should be shopping_cart")
 	}
+	db.SingularTable(false)
 }
 
 type BigEmail struct {

main.go

@@ -2,11 +2,12 @@ package gorm
 
 import "database/sql"
 
+var singularTableName bool
+
 type DB struct {
-	db                *sql.DB
-	driver            string
-	DebugMode         bool
-	SingularTableName bool
+	db        *sql.DB
+	driver    string
+	DebugMode bool
 }
 
 func Open(driver, source string) (db DB, err error) {
@@ -20,11 +21,11 @@ func (s *DB) SetPool(n int) {
 }
 
 func (s *DB) SingularTable(result bool) {
-	s.SingularTableName = result
+	singularTableName = result
 }
 
 func (s *DB) buildChain() *Chain {
-	return &Chain{db: s.db, driver: s.driver, debug: s.DebugMode, singularTableName: s.SingularTableName}
+	return &Chain{db: s.db, driver: s.driver, debug: s.DebugMode}
 }
 
 func (s *DB) Where(querystring interface{}, args ...interface{}) *Chain {

model.go

@@ -278,7 +278,7 @@ func (m *Model) typeName() string {
 	return typ.Name()
 }
 
-func (m *Model) tableName(singularTableName bool) (str string, err error) {
+func (m *Model) tableName() (str string, err error) {
 	if m.data == nil {
 		err = errors.New("Model haven't been set")
 		return