diff --git a/field.go b/field.go
index 450712d1..459d6677 100644
--- a/field.go
+++ b/field.go
@@ -38,19 +38,20 @@ func (field *Field) Set(value interface{}) (err error) {
 	return
 }
 
-type relationship struct {
-	JoinTable             string
-	ForeignKey            string
-	ForeignType           string
-	AssociationForeignKey string
-	Kind                  string
+// Fields get value's fields
+func (scope *Scope) Fields() map[string]*Field {
+	fields := map[string]*Field{}
+	structFields := scope.GetStructFields()
+
+	for _, structField := range structFields {
+		fields[structField.DBName] = scope.getField(structField)
+	}
+
+	return fields
 }
 
-// FIXME
-func (r relationship) ForeignDBName() string {
-	return ToSnake(r.ForeignKey)
-}
-
-func (r relationship) AssociationForeignDBName(name string) string {
-	return ToSnake(r.AssociationForeignKey)
+func (scope *Scope) getField(structField *StructField) *Field {
+	field := Field{StructField: structField}
+	field.Field = scope.IndirectValue().FieldByName(structField.Name)
+	return &field
 }
diff --git a/model_struct.go b/model_struct.go
index de9bd141..9229c540 100644
--- a/model_struct.go
+++ b/model_struct.go
@@ -43,7 +43,7 @@ type Relationship struct {
 	JoinTable                   string
 }
 
-func (scope *Scope) GenerateSqlTag(field *StructField) {
+func (scope *Scope) generateSqlTag(field *StructField) {
 	var sqlType string
 	reflectValue := reflect.Indirect(reflect.New(field.Struct.Type))
 
@@ -246,7 +246,7 @@ func (scope *Scope) GetModelStruct() *ModelStruct {
 				modelStruct.PrimaryKeyField = field
 			}
 
-			scope.GenerateSqlTag(field)
+			scope.generateSqlTag(field)
 		}
 	}
 
diff --git a/scope.go b/scope.go
index 0bee5b9b..55b60b46 100644
--- a/scope.go
+++ b/scope.go
@@ -95,28 +95,7 @@ func (scope *Scope) HasError() bool {
 }
 
 func (scope *Scope) PrimaryKeyField() *Field {
-	if scope.primaryKeyField == nil {
-		var indirectValue = scope.IndirectValue()
-
-		clone := scope
-		// FIXME
-		if indirectValue.Kind() == reflect.Slice {
-			typ := indirectValue.Type().Elem()
-			if typ.Kind() == reflect.Ptr {
-				typ = typ.Elem()
-			}
-			clone = scope.New(reflect.New(typ).Elem().Addr().Interface())
-		}
-
-		for _, field := range clone.Fields() {
-			if field.IsPrimaryKey {
-				scope.primaryKeyField = field
-				break
-			}
-		}
-	}
-
-	return scope.primaryKeyField
+	return scope.getField(scope.GetModelStruct().PrimaryKeyField)
 }
 
 // PrimaryKey get the primary key's column name
@@ -135,7 +114,7 @@ func (scope *Scope) PrimaryKeyZero() bool {
 
 // PrimaryKeyValue get the primary key's value
 func (scope *Scope) PrimaryKeyValue() interface{} {
-	if field := scope.PrimaryKeyField(); field != nil {
+	if field := scope.PrimaryKeyField(); field != nil && field.Field.IsValid() {
 		return field.Field.Interface()
 	} else {
 		return 0
@@ -294,18 +273,6 @@ func (scope *Scope) FieldByName(name string) (field *Field, ok bool) {
 	return nil, false
 }
 
-// Fields get value's fields
-func (scope *Scope) Fields() map[string]*Field {
-	fields := map[string]*Field{}
-	structFields := scope.GetStructFields()
-	for _, structField := range structFields {
-		field := Field{StructField: structField}
-		fields[field.DBName] = &field
-	}
-
-	return fields
-}
-
 // Raw set sql
 func (scope *Scope) Raw(sql string) *Scope {
 	scope.Sql = strings.Replace(sql, "$$", "?", -1)