feat: add default impl for Index interface

migrator/index.go

@@ -0,0 +1,44 @@
+package migrator
+
+import "database/sql"
+
+// Index implements gorm.Index interface
+type Index struct {
+	TableName       string
+	NameValue       string
+	ColumnList      []string
+	PrimaryKeyValue sql.NullBool
+	UniqueValue     sql.NullBool
+	OptionValue     string
+}
+
+// Table returns the table name of the index.
+func (idx Index) Table() string {
+	return idx.TableName
+}
+
+// Name returns the name  of the index.
+func (idx Index) Name() string {
+	return idx.NameValue
+}
+
+// Columns return the columns fo the index
+func (idx Index) Columns() []string {
+	return idx.ColumnList
+}
+
+// PrimaryKey returns the index is primary key or not.
+func (idx Index) PrimaryKey() (isPrimaryKey bool, ok bool) {
+	return idx.PrimaryKeyValue.Bool, idx.PrimaryKeyValue.Valid
+}
+
+// Unique reports whether the index is unique or not.
+func (idx Index) Unique() (unique bool, ok bool) {
+	return idx.UniqueValue.Bool, idx.UniqueValue.Valid
+
+}
+
+// Option return the optional attribute fo the index
+func (idx Index) Option() string {
+	return idx.OptionValue
+}