feat(schema): expand Table and Fields also add ForeignKey

Refs: #7

Author: piraz

internal/schema/schema.go

@@ -1,12 +1,35 @@
 package schema
 
+type ReferenceOption string
+
+const (
+	ReferenceOptionCascade    ReferenceOption = "CASCADE"
+	ReferenceOptionNoAction   ReferenceOption = "NO ACTION"
+	ReferenceOptionSetDefault ReferenceOption = "SET DEFAULT"
+	ReferenceOptionSetNull    ReferenceOption = "SET NULL"
+	ReferenceOptionRestrict   ReferenceOption = "RESTRICT"
+)
+
 type Table struct {
-	Name   string
-	Schema string
-	Fields []*Field
+	Fields      []*Field
+	ForeingKeys []*ForeingKey
+	Name        string
+	Schema      string
 }
 
 type Field struct {
-	Name string
-	Type string
+	Default  string
+	Name     string
+	Nullable bool
+	Primary  bool
+	Type     string
+}
+
+type ForeingKey struct {
+	Fields         []*Field
+	Name           string
+	OnDelete       ReferenceOption
+	OnUpdate       ReferenceOption
+	ReferredTable  []*Table
+	ReferredFields []*Field
 }

internal/sqlok_test.go

@@ -16,7 +16,7 @@ type User struct {
 func TestHttpTransport(t *testing.T) {
 	user := User{}
 	userType := reflect.TypeOf(user)
-	for i := 0; i < userType.NumField(); i++ {
+	for i := range userType.NumField() {
 		field := userType.Field(i)
 		tag := field.Tag.Get("sqlok")