Fix AutoMigrate for bool fields with default value

migrator/migrator.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"reflect"
 	"regexp"
+	"strconv"
 	"strings"
 	"time"
 
@@ -518,12 +519,18 @@ func (m Migrator) MigrateColumn(value interface{}, field *schema.Field, columnTy
 		} else if !dvNotNull && currentDefaultNotNull {
 			// null -> default value
 			alterColumn = true
-		} else if (field.GORMDataType != schema.Time && dv != field.DefaultValue) ||
-			(field.GORMDataType == schema.Time && !strings.EqualFold(strings.TrimSuffix(dv, "()"), strings.TrimSuffix(field.DefaultValue, "()"))) {
-			// default value not equal
-			// not both null
-			if currentDefaultNotNull || dvNotNull {
-				alterColumn = true
+		} else if currentDefaultNotNull || dvNotNull {
+			switch field.GORMDataType {
+			case schema.Time:
+				if !strings.EqualFold(strings.TrimSuffix(dv, "()"), strings.TrimSuffix(field.DefaultValue, "()")) {
+					alterColumn = true
+				}
+			case schema.Bool:
+				v1, _ := strconv.ParseBool(dv)
+				v2, _ := strconv.ParseBool(field.DefaultValue)
+				alterColumn = v1 != v2
+			default:
+				alterColumn = dv != field.DefaultValue
 			}
 		}
 	}

tests/migrate_test.go

@@ -7,6 +7,7 @@ import (
 	"math/rand"
 	"os"
 	"reflect"
+	"strconv"
 	"strings"
 	"testing"
 	"time"
@@ -1420,7 +1421,7 @@ func TestMigrateSameEmbeddedFieldName(t *testing.T) {
 	AssertEqual(t, nil, err)
 }
 
-func TestMigrateDefaultNullString(t *testing.T) {
+func TestMigrateWithDefaultValue(t *testing.T) {
 	if DB.Dialector.Name() == "sqlserver" {
 		// sqlserver driver treats NULL and 'NULL' the same
 		t.Skip("skip sqlserver")
@@ -1434,6 +1435,7 @@ func TestMigrateDefaultNullString(t *testing.T) {
 	type NullStringModel struct {
 		ID      uint
 		Content string `gorm:"default:'null'"`
+		Active  bool   `gorm:"default:false"`
 	}
 
 	tableName := "null_string_model"
@@ -1454,6 +1456,14 @@ func TestMigrateDefaultNullString(t *testing.T) {
 	AssertEqual(t, defVal, "null")
 	AssertEqual(t, ok, true)
 
+	columnType2, err := findColumnType(tableName, "active")
+	AssertEqual(t, err, nil)
+
+	defVal, ok = columnType2.DefaultValue()
+	bv, _ := strconv.ParseBool(defVal)
+	AssertEqual(t, bv, false)
+	AssertEqual(t, ok, true)
+
 	// default 'null' -> 'null'
 	session := DB.Session(&gorm.Session{Logger: Tracer{
 		Logger: DB.Config.Logger,