add MapColumns method

chainable_api.go

@@ -185,6 +185,13 @@ func (db *DB) Omit(columns ...string) (tx *DB) {
 	return
 }
 
+// MapColumns specify column-to-field for customizing how database columns are assigned to struct fields during querying
+func (db *DB) MapColumns(m map[string]string) (tx *DB) {
+	tx = db.getInstance()
+	tx.Statement.ColumnMapping = m
+	return
+}
+
 // Where add conditions
 //
 // See the [docs] for details on the various formats that where clauses can take. By default, where clauses chain with AND.

scan.go

@@ -131,6 +131,15 @@ func Scan(rows Rows, db *DB, mode ScanMode) {
 		onConflictDonothing = mode&ScanOnConflictDoNothing != 0
 	)
 
+	if len(db.Statement.ColumnMapping) > 0 {
+		for i, column := range columns {
+			v, ok := db.Statement.ColumnMapping[column]
+			if ok {
+				columns[i] = v
+			}
+		}
+	}
+
 	db.RowsAffected = 0
 
 	switch dest := db.Statement.Dest.(type) {

statement.go

@@ -30,8 +30,9 @@ type Statement struct {
 	Clauses              map[string]clause.Clause
 	BuildClauses         []string
 	Distinct             bool
-	Selects              []string // selected columns
-	Omits                []string // omit columns
+	Selects              []string          // selected columns
+	Omits                []string          // omit columns
+	ColumnMapping        map[string]string // map columns
 	Joins                []join
 	Preloads             map[string][]interface{}
 	Settings             sync.Map