diff --git a/engine.go b/engine.go
index 4984d374..f5af6d9d 100644
--- a/engine.go
+++ b/engine.go
@@ -1091,7 +1091,25 @@ func (engine *Engine) idOfV(rv reflect.Value) (core.PK, error) {
 	pk := make([]interface{}, len(table.PrimaryKeys))
 	for i, col := range table.PKColumns() {
 		var err error
-		pkField := v.FieldByName(col.FieldName)
+
+		fieldName := col.FieldName
+		for {
+			parts := strings.SplitN(fieldName, ".", 2)
+			if len(parts) == 1 {
+				break
+			}
+
+			v = v.FieldByName(parts[0])
+			if v.Kind() == reflect.Ptr {
+				v = v.Elem()
+			}
+			if v.Kind() != reflect.Struct {
+				return nil, ErrUnSupportedType
+			}
+			fieldName = parts[1]
+		}
+		fmt.Println(table.Name, fieldName, v)
+		pkField := v.FieldByName(fieldName)
 		switch pkField.Kind() {
 		case reflect.String:
 			pk[i], err = engine.idTypeAssertion(col, pkField.String())
diff --git a/error.go b/error.go
index 1694683c..5dc6b84e 100644
--- a/error.go
+++ b/error.go
@@ -13,21 +13,21 @@ var (
 	// ErrParamsType params error
 	ErrParamsType = errors.New("Params type error")
 	// ErrTableNotFound table not found error
-	ErrTableNotFound = errors.New("Not found table")
+	ErrTableNotFound = errors.New("Table not found")
 	// ErrUnSupportedType unsupported error
 	ErrUnSupportedType = errors.New("Unsupported type error")
-	// ErrNotExist record is not exist error
-	ErrNotExist = errors.New("Not exist error")
+	// ErrNotExist record does not exist error
+	ErrNotExist = errors.New("Record does not exist")
 	// ErrCacheFailed cache failed error
 	ErrCacheFailed = errors.New("Cache failed")
 	// ErrNeedDeletedCond delete needs less one condition error
-	ErrNeedDeletedCond = errors.New("Delete need at least one condition")
+	ErrNeedDeletedCond = errors.New("Delete action needs at least one condition")
 	// ErrNotImplemented not implemented
 	ErrNotImplemented = errors.New("Not implemented")
 	// ErrConditionType condition type unsupported
-	ErrConditionType = errors.New("Unsupported conditon type")
-	// ErrColumnIsNotExist columns is not exist
-	ErrFieldIsNotExist = errors.New("Field is not exist")
+	ErrConditionType = errors.New("Unsupported condition type")
+	// ErrFieldIsNotExist columns does not exist
+	ErrFieldIsNotExist = errors.New("Field does not exist")
 )
 
 // ErrFieldIsNotValid is not valid
diff --git a/session_find_test.go b/session_find_test.go
index 6a04dc57..c215fd57 100644
--- a/session_find_test.go
+++ b/session_find_test.go
@@ -655,5 +655,77 @@ func TestFindMapStringId(t *testing.T) {
 	cnt, err = testEngine.ID("1").Delete(new(FindMapDevice))
 	assert.NoError(t, err)
 	assert.EqualValues(t, 1, cnt)
-
+}
+
+func TestFindExtends(t *testing.T) {
+	type FindExtendsB struct {
+		ID int64
+	}
+
+	type FindExtendsA struct {
+		FindExtendsB `xorm:"extends"`
+	}
+
+	assert.NoError(t, prepareEngine())
+	assertSync(t, new(FindExtendsA))
+
+	cnt, err := testEngine.Insert(&FindExtendsA{
+		FindExtendsB: FindExtendsB{},
+	})
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, cnt)
+
+	cnt, err = testEngine.Insert(&FindExtendsA{
+		FindExtendsB: FindExtendsB{},
+	})
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, cnt)
+
+	var results []FindExtendsA
+	err = testEngine.Find(&results)
+	assert.NoError(t, err)
+	assert.EqualValues(t, 2, len(results))
+}
+
+func TestFindExtends3(t *testing.T) {
+	type FindExtendsCC struct {
+		ID   int64
+		Name string
+	}
+
+	type FindExtendsBB struct {
+		FindExtendsCC `xorm:"extends"`
+	}
+
+	type FindExtendsAA struct {
+		FindExtendsBB `xorm:"extends"`
+	}
+
+	assert.NoError(t, prepareEngine())
+	assertSync(t, new(FindExtendsAA))
+
+	cnt, err := testEngine.Insert(&FindExtendsAA{
+		FindExtendsBB: FindExtendsBB{
+			FindExtendsCC: FindExtendsCC{
+				Name: "cc1",
+			},
+		},
+	})
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, cnt)
+
+	cnt, err = testEngine.Insert(&FindExtendsAA{
+		FindExtendsBB: FindExtendsBB{
+			FindExtendsCC: FindExtendsCC{
+				Name: "cc2",
+			},
+		},
+	})
+	assert.NoError(t, err)
+	assert.EqualValues(t, 1, cnt)
+
+	var results []FindExtendsAA
+	err = testEngine.Find(&results)
+	assert.NoError(t, err)
+	assert.EqualValues(t, 2, len(results))
 }
diff --git a/session_insert_test.go b/session_insert_test.go
index c87ae3a9..50943032 100644
--- a/session_insert_test.go
+++ b/session_insert_test.go
@@ -741,3 +741,42 @@ func TestInsertMulti4(t *testing.T) {
 	assert.NoError(t, err)
 	assert.EqualValues(t, len(users), cnt)
 }
+
+func TestAnonymousStruct(t *testing.T) {
+	type PlainObject struct {
+		ID   uint64 `json:"id,string" xorm:"'ID' pk autoincr"`
+		Desc string `json:"desc" xorm:"'DESC' notnull"`
+	}
+
+	type PlainFoo struct {
+		PlainObject `xorm:"extends"` // primary key defined in extends struct
+
+		Width  uint32 `json:"width" xorm:"'WIDTH' notnull"`
+		Height uint32 `json:"height" xorm:"'HEIGHT' notnull"`
+
+		Ext struct {
+			F1 uint32 `json:"f1,omitempty"`
+			F2 uint32 `json:"f2,omitempty"`
+		} `json:"ext" xorm:"'EXT' json notnull"`
+	}
+
+	assert.NoError(t, prepareEngine())
+	assertSync(t, new(PlainFoo))
+
+	_, err := testEngine.Insert(&PlainFoo{
+		PlainObject: PlainObject{
+			Desc: "test",
+		},
+		Width:  10,
+		Height: 20,
+
+		Ext: struct {
+			F1 uint32 `json:"f1,omitempty"`
+			F2 uint32 `json:"f2,omitempty"`
+		}{
+			F1: 11,
+			F2: 12,
+		},
+	})
+	assert.NoError(t, err)
+}