Fixed bug/gorm indexes

pkg/writers/bun/type_mapper.go

@@ -196,15 +196,31 @@ func (tm *TypeMapper) BuildBunTag(column *models.Column, table *models.Table) st
 		parts = append(parts, "nullzero")
 	}
 
-	// Check for unique constraint
+	// Check for indexes (unique indexes should be added to tag)
 	if table != nil {
-		for _, constraint := range table.Constraints {
-			if constraint.Type == models.UniqueConstraint {
-				for _, col := range constraint.Columns {
-					if col == column.Name {
-						parts = append(parts, "unique")
-						break
+		for _, index := range table.Indexes {
+			if !index.Unique {
+				continue
+			}
+			// Check if this column is in the index
+			for _, col := range index.Columns {
+				if col == column.Name {
+					// Add unique tag with index name for composite indexes
+					// or simple unique for single-column indexes
+					if len(index.Columns) > 1 {
+						// Composite index - use index name
+						parts = append(parts, fmt.Sprintf("unique:%s", index.Name))
+					} else {
+						// Single column - use index name if it's not auto-generated
+						// Auto-generated names typically follow pattern: idx_tablename_columnname
+						expectedAutoName := fmt.Sprintf("idx_%s_%s", table.Name, column.Name)
+						if index.Name == expectedAutoName {
+							parts = append(parts, "unique")
+						} else {
+							parts = append(parts, fmt.Sprintf("unique:%s", index.Name))
+						}
 					}
+					break
 				}
 			}
 		}