fix(pgdialect): auto-enable array support if the sql type is an array

dialect/pgdialect/dialect.go

@@ -3,6 +3,7 @@ package pgdialect
 import (
 	"database/sql"
 	"strconv"
+	"strings"
 
 	"github.com/uptrace/bun/dialect"
 	"github.com/uptrace/bun/dialect/feature"
@@ -68,7 +69,7 @@ func (d *Dialect) onField(field *schema.Field) {
 		}
 	}
 
-	if field.Tag.HasOption("array") {
+	if field.Tag.HasOption("array") || strings.HasSuffix(field.UserSQLType, "[]") {
 		field.Append = d.arrayAppender(field.StructField.Type)
 		field.Scan = arrayScanner(field.StructField.Type)
 	}

internal/dbtest/pg_test.go

@@ -368,6 +368,27 @@ func TestPGBytea(t *testing.T) {
 	require.Equal(t, []byte("hello"), model.Bytes)
 }
 
+func TestPGByteaArray(t *testing.T) {
+	type Model struct {
+		BytesSlice [][]byte `bun:"type:bytea[]"`
+	}
+
+	db := pg(t)
+	defer db.Close()
+
+	err := db.ResetModel(ctx, (*Model)(nil))
+	require.NoError(t, err)
+
+	model1 := &Model{BytesSlice: [][]byte{[]byte("hello"), []byte("world")}}
+	_, err = db.NewInsert().Model(model1).Exec(ctx)
+	require.NoError(t, err)
+
+	model2 := new(Model)
+	err = db.NewSelect().Model(model2).Scan(ctx)
+	require.NoError(t, err)
+	require.Equal(t, model1.BytesSlice, model2.BytesSlice)
+}
+
 func TestPGDate(t *testing.T) {
 	db := pg(t)
 	defer db.Close()