fix sort duplicate key error

mongox/pagination.go

@@ -8,6 +8,7 @@ import (
 	"github.com/reearth/reearthx/rerror"
 	"github.com/reearth/reearthx/usecasex"
 	"go.mongodb.org/mongo-driver/bson"
+	"go.mongodb.org/mongo-driver/bson/primitive"
 	"go.mongodb.org/mongo-driver/mongo"
 	"go.mongodb.org/mongo-driver/mongo/options"
 )
@@ -40,8 +41,15 @@ func (c *Collection) Paginate(ctx context.Context, rawFilter any, s *usecasex.So
 		sortOrder *= -1
 	}
 
+	var sort primitive.D
+	if sortKey == idKey {
+		sort = bson.D{{Key: sortKey, Value: sortOrder}}
+	} else {
+		sort = bson.D{{Key: sortKey, Value: sortOrder}, {Key: idKey, Value: sortOrder}}
+	}
+
 	findOpts := options.Find().
-		SetSort(bson.D{{Key: sortKey, Value: sortOrder}, {Key: idKey, Value: sortOrder}}).
+		SetSort(sort).
 		SetLimit(limit(*p))
 
 	if p.Offset != nil {
@@ -199,11 +207,11 @@ func (c *Collection) aggregateFilter(ctx context.Context, p usecasex.Pagination,
 }
 
 func aggregateOptionsFromPagination(_ usecasex.Pagination, _ *usecasex.Sort) *options.AggregateOptions {
-    collation := options.Collation{
-        Locale:   "en",
-        Strength: 2,
-    }
-    return options.Aggregate().SetAllowDiskUse(true).SetCollation(&collation)
+	collation := options.Collation{
+		Locale:   "en",
+		Strength: 2,
+	}
+	return options.Aggregate().SetAllowDiskUse(true).SetCollation(&collation)
 }
 
 func (c *Collection) pageFilter(ctx context.Context, p usecasex.Pagination, s *usecasex.Sort) (bson.M, error) {
@@ -280,11 +288,11 @@ func (c *Collection) getCursorDocument(ctx context.Context, cursor usecasex.Curs
 }
 
 func sortFilter(p usecasex.Pagination, s *usecasex.Sort) bson.D {
-    var sortOptions bson.D
-    if s != nil && s.Key != "" && s.Key != idKey {
-        sortOptions = append(sortOptions, bson.E{Key: s.Key, Value: sortDirection(p, s)})
-    }
-    return append(sortOptions, bson.E{Key: idKey, Value: sortDirection(p, s)})
+	var sortOptions bson.D
+	if s != nil && s.Key != "" && s.Key != idKey {
+		sortOptions = append(sortOptions, bson.E{Key: s.Key, Value: sortDirection(p, s)})
+	}
+	return append(sortOptions, bson.E{Key: idKey, Value: sortDirection(p, s)})
 }
 
 func limit(p usecasex.Pagination) int64 {