Add FT.ALTER in OM JSON and Hash repo

om/hash.go

@@ -134,6 +134,12 @@ func (r *HashRepository[T]) Remove(ctx context.Context, id string) error {
 	return r.client.Do(ctx, r.client.B().Del().Key(key(r.prefix, id)).Build()).Error()
 }
 
+// AlterIndex uses FT.ALTER from the RediSearch module to alter index under the name `hashidx:{prefix}`
+// You can use the cmdFn parameter to mutate the index alter command.
+func (r *HashRepository[T]) AlterIndex(ctx context.Context, cmdFn func(alter FtAlterIndex) rueidis.Completed) error {
+	return r.client.Do(ctx, cmdFn(r.client.B().FtAlter().Index(r.idx))).Error()
+}
+
 // CreateIndex uses FT.CREATE from the RediSearch module to create inverted index under the name `hashidx:{prefix}`
 // You can use the cmdFn parameter to mutate the index construction command.
 func (r *HashRepository[T]) CreateIndex(ctx context.Context, cmdFn func(schema FtCreateSchema) rueidis.Completed) error {

om/hash_test.go

@@ -3,6 +3,7 @@ package om
 import (
 	"context"
 	"encoding/json"
+	"fmt"
 	"math/rand"
 	"reflect"
 	"strings"
@@ -240,6 +241,63 @@ func TestNewHashRepository(t *testing.T) {
 				t.Fatalf("should not be found, but got %v", e)
 			}
 		})
+
+		t.Run("Alter Index", func(t *testing.T) {
+			err := repo.CreateIndex(ctx, func(schema FtCreateSchema) rueidis.Completed {
+				return schema.FieldName("Val").Text().Build()
+			})
+			if err != nil {
+				t.Fatal(err)
+			}
+			time.Sleep(time.Second)
+			var entities []*HashTestStruct
+			for i := 3; i >= 1; i-- {
+				e := repo.NewEntity()
+				e.Val = []byte("any")
+				e.Vec32 = []float32{3, 2, 1}
+				e.Vec64 = []float64{1, 2, 3}
+				e.JSON = []byte(fmt.Sprintf("[%d]", i))
+				err = repo.Save(ctx, e)
+				if err != nil {
+					t.Fatal(err)
+				}
+				entities = append(entities, e)
+			}
+			time.Sleep(time.Second)
+			_, _, err = repo.Search(ctx, func(search FtSearchIndex) rueidis.Completed {
+				return search.Query("*").Sortby("JSON").Build()
+			})
+			if err == nil {
+				t.Fatalf("search by property not loaded nor in schema")
+			}
+			err = repo.AlterIndex(ctx, func(alter FtAlterIndex) rueidis.Completed {
+				return alter.
+					Schema().Add().Field("JSON").Options("TEXT").
+					Build()
+			})
+			if err != nil {
+				t.Fatal(err)
+			}
+			time.Sleep(time.Second)
+			n, records, err := repo.Search(ctx, func(search FtSearchIndex) rueidis.Completed {
+				return search.Query("*").Sortby("JSON").Build()
+			})
+			if err != nil {
+				t.Fatal(err)
+			}
+			if n != 3 {
+				t.Fatalf("unexpected total count %v", n)
+			}
+			if len(records) != 3 {
+				t.Fatalf("unexpected return count %v", n)
+			}
+			if !reflect.DeepEqual(entities[2], records[0]) {
+				t.Fatalf("entities[0] should be the same as records[2]")
+			}
+			if err = repo.DropIndex(ctx); err != nil {
+				t.Fatal(err)
+			}
+		})
 	})
 
 	t.Run("SaveMulti", func(t *testing.T) {

om/json.go

@@ -132,6 +132,12 @@ func (r *JSONRepository[T]) Remove(ctx context.Context, id string) error {
 	return r.client.Do(ctx, r.client.B().Del().Key(key(r.prefix, id)).Build()).Error()
 }
 
+// AlterIndex uses FT.ALTER from the RediSearch module to alter index under the name `jsonidx:{prefix}`
+// You can use the cmdFn parameter to mutate the index alter command.
+func (r *JSONRepository[T]) AlterIndex(ctx context.Context, cmdFn func(alter FtAlterIndex) rueidis.Completed) error {
+	return r.client.Do(ctx, cmdFn(r.client.B().FtAlter().Index(r.idx))).Error()
+}
+
 // CreateIndex uses FT.CREATE from the RediSearch module to create inverted index under the name `jsonidx:{prefix}`
 // You can use the cmdFn parameter to mutate the index construction command,
 // and note that the field name should be specified with JSON path syntax, otherwise the index may not work as expected.

om/json_test.go

@@ -2,6 +2,7 @@ package om
 
 import (
 	"context"
+	"fmt"
 	"reflect"
 	"testing"
 	"time"
@@ -204,6 +205,65 @@ func TestNewJSONRepository(t *testing.T) {
 				t.Fatalf("should not be found, but got %v", e)
 			}
 		})
+
+		t.Run("Alter Index", func(t *testing.T) {
+			err := repo.CreateIndex(ctx, func(schema FtCreateSchema) rueidis.Completed {
+				return schema.FieldName("$.Val").Text().Build()
+			})
+			if err != nil {
+				t.Fatal(err)
+			}
+			time.Sleep(time.Second)
+			var entities []*JSONTestStruct
+			for i := 3; i >= 1; i-- {
+				e := repo.NewEntity()
+				e.Val = []byte("any")
+				e.Nested = struct {
+					F1 string
+				}{
+					F1: fmt.Sprintf("%d", i),
+				}
+				err = repo.Save(ctx, e)
+				if err != nil {
+					t.Fatal(err)
+				}
+				entities = append(entities, e)
+			}
+			time.Sleep(time.Second)
+			n, records, err := repo.Search(ctx, func(search FtSearchIndex) rueidis.Completed {
+				return search.Query("*").Sortby("$.Nested.F1").Build()
+			})
+			if err == nil {
+				t.Fatalf("search by property not loaded nor in schema")
+			}
+			err = repo.AlterIndex(ctx, func(alter FtAlterIndex) rueidis.Completed {
+				return alter.
+					Schema().Add().Field("$.Nested.F1").Options("TEXT").
+					Build()
+			})
+			if err != nil {
+				t.Fatal(err)
+			}
+			time.Sleep(time.Second)
+			n, records, err = repo.Search(ctx, func(search FtSearchIndex) rueidis.Completed {
+				return search.Query("*").Sortby("$.Nested.F1").Build()
+			})
+			if err != nil {
+				t.Fatal(err)
+			}
+			if n != 3 {
+				t.Fatalf("unexpected total count %v", n)
+			}
+			if len(records) != 3 {
+				t.Fatalf("unexpected return count %v", n)
+			}
+			if !reflect.DeepEqual(entities[2], records[0]) {
+				t.Fatalf("entities[0] should be the same as records[2]")
+			}
+			if err = repo.DropIndex(ctx); err != nil {
+				t.Fatal(err)
+			}
+		})
 	})
 
 	t.Run("SaveMulti", func(t *testing.T) {

om/repo.go

@@ -16,6 +16,8 @@ type (
 	FtSearchIndex = cmds.FtSearchIndex
 	// FtAggregateIndex is the FT.AGGREGATE command builder
 	FtAggregateIndex = cmds.FtAggregateIndex
+	// FtAlterSchema is the FT.ALTERINDEX command builder
+	FtAlterIndex = cmds.FtAlterIndex
 	// Arbitrary is alias to cmds.Arbitrary. This allows user build arbitrary command in Repository.CreateIndex
 	Arbitrary = cmds.Arbitrary
 )
@@ -43,6 +45,7 @@ type Repository[T any] interface {
 	SaveMulti(ctx context.Context, entity ...*T) (errs []error)
 	Remove(ctx context.Context, id string) error
 	CreateIndex(ctx context.Context, cmdFn func(schema FtCreateSchema) rueidis.Completed) error
+	AlterIndex(ctx context.Context, cmdFn func(alter FtAlterIndex) rueidis.Completed) error
 	DropIndex(ctx context.Context) error
 	IndexName() string
 }