Add option tag support for index

migrator/migrator.go

@@ -188,7 +188,13 @@ func (m Migrator) CreateTable(values ...interface{}) error {
 					if idx.Class != "" {
 						createTableSQL += idx.Class + " "
 					}
-					createTableSQL += "INDEX ? ?,"
+					createTableSQL += "INDEX ? ?"
+
+					if idx.Option != "" {
+						createTableSQL += " " + idx.Option
+					}
+
+					createTableSQL += ","
 					values = append(values, clause.Expr{SQL: idx.Name}, tx.Migrator().(BuildIndexOptionsInterface).BuildIndexOptions(idx.Fields, stmt))
 				}
 			}
@@ -543,6 +549,10 @@ func (m Migrator) CreateIndex(value interface{}, name string) error {
 				createIndexSQL += " USING " + idx.Type
 			}
 
+			if idx.Option != "" {
+				createIndexSQL += " " + idx.Option
+			}
+
 			return m.DB.Exec(createIndexSQL, values...).Error
 		}
 

schema/index.go

@@ -12,6 +12,7 @@ type Index struct {
 	Type    string // btree, hash, gist, spgist, gin, and brin
 	Where   string
 	Comment string
+	Option  string // WITH PARSER parser_name
 	Fields  []IndexOption
 }
 
@@ -45,6 +46,9 @@ func (schema *Schema) ParseIndexes() map[string]Index {
 				if idx.Comment == "" {
 					idx.Comment = index.Comment
 				}
+				if idx.Option == "" {
+					idx.Option = index.Option
+				}
 
 				idx.Fields = append(idx.Fields, index.Fields...)
 				sort.Slice(idx.Fields, func(i, j int) bool {
@@ -119,6 +123,7 @@ func parseFieldIndexes(field *Field) (indexes []Index) {
 					Type:    settings["TYPE"],
 					Where:   settings["WHERE"],
 					Comment: settings["COMMENT"],
+					Option:  settings["OPTION"],
 					Fields: []IndexOption{{
 						Field:      field,
 						Expression: settings["EXPRESSION"],

schema/index_test.go

@@ -15,7 +15,7 @@ type UserIndex struct {
 	Name4        string `gorm:"uniqueIndex"`
 	Name5        int64  `gorm:"index:,class:FULLTEXT,comment:hello \\, world,where:age > 10"`
 	Name6        int64  `gorm:"index:profile,comment:hello \\, world,where:age > 10"`
-	Age          int64  `gorm:"index:profile,expression:ABS(age)"`
+	Age          int64  `gorm:"index:profile,expression:ABS(age),option:WITH PARSER parser_name"`
 	OID          int64  `gorm:"index:idx_id;index:idx_oid,unique"`
 	MemberNumber string `gorm:"index:idx_id,priority:1"`
 }
@@ -63,6 +63,7 @@ func TestParseIndex(t *testing.T) {
 			Name:    "profile",
 			Comment: "hello , world",
 			Where:   "age > 10",
+			Option:  "WITH PARSER parser_name",
 			Fields: []schema.IndexOption{{Field: &schema.Field{Name: "Name6"}}, {
 				Field:      &schema.Field{Name: "Age"},
 				Expression: "ABS(age)",
@@ -87,7 +88,7 @@ func TestParseIndex(t *testing.T) {
 			t.Fatalf("Failed to found index %v from parsed indices %+v", k, indices)
 		}
 
-		for _, name := range []string{"Name", "Class", "Type", "Where", "Comment"} {
+		for _, name := range []string{"Name", "Class", "Type", "Where", "Comment", "Option"} {
 			if reflect.ValueOf(result).FieldByName(name).Interface() != reflect.ValueOf(v).FieldByName(name).Interface() {
 				t.Errorf(
 					"index %v %v should equal, expects %v, got %v",

tests/go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/jinzhu/now v1.1.1
 	github.com/lib/pq v1.6.0
 	gorm.io/driver/mysql v1.0.2
-	gorm.io/driver/postgres v1.0.3
+	gorm.io/driver/postgres v1.0.4
 	gorm.io/driver/sqlite v1.1.3
 	gorm.io/driver/sqlserver v1.0.5
 	gorm.io/gorm v1.20.2