diff --git a/src/generator/default/dbmodel.php b/src/generator/default/dbmodel.php
index 17fa4a84..a3d269b6 100644
--- a/src/generator/default/dbmodel.php
+++ b/src/generator/default/dbmodel.php
@@ -49,8 +49,8 @@
  */
 abstract class <?= $model->getClassName() ?> extends \yii\db\ActiveRecord
 {
-<?php if($scenarios = $model->getScenarios()):
-foreach($scenarios as $scenario): ?>
+<?php if ($scenarios = $model->getScenarios()):
+foreach ($scenarios as $scenario): ?>
     /**
      *<?= $scenario['description'] ?>
 
@@ -76,7 +76,7 @@ public static function tableName()
     {
         return <?= var_export($model->getTableAlias()) ?>;
     }
-<?php if($scenarios): ?>
+<?php if ($scenarios): ?>
 
     /**
      * Automatically generated scenarios from the model 'x-scenarios'.
@@ -92,7 +92,7 @@ public function scenarios()
         $default = parent::scenarios()[self::SCENARIO_DEFAULT];
 
         return [
-<?php foreach($scenarios as $scenario): ?>
+<?php foreach ($scenarios as $scenario): ?>
             self::<?= $scenario['const'] ?> => $default,
 <?php endforeach; ?>
             /**
diff --git a/src/lib/ValidationRulesBuilder.php b/src/lib/ValidationRulesBuilder.php
index 3f3c1398..87337a42 100644
--- a/src/lib/ValidationRulesBuilder.php
+++ b/src/lib/ValidationRulesBuilder.php
@@ -10,8 +10,7 @@
 use cebe\yii2openapi\lib\items\Attribute;
 use cebe\yii2openapi\lib\items\DbModel;
 use cebe\yii2openapi\lib\items\ValidationRule;
-use yii\helpers\VarDumper;
-use yii\validators\DateValidator;
+use yii\db\Expression;
 use function count;
 use function implode;
 use function in_array;
@@ -192,12 +191,11 @@ private function defaultRule(Attribute $attribute):void
         if ($attribute->defaultValue === null) {
             return;
         }
-        if ($attribute->defaultValue instanceof \yii\db\Expression) {
-            return;
-        }
 
         $params = [];
-        $params['value'] = $attribute->defaultValue;
+        $params['value'] = ($attribute->defaultValue instanceof \yii\db\Expression) ?
+            $this->wrapDefaultExpression($attribute->defaultValue) :
+            $attribute->defaultValue;
         $key = $attribute->columnName . '_default';
         $this->rules[$key] = new ValidationRule([$attribute->columnName], 'default', $params);
     }
@@ -251,4 +249,14 @@ private function prepareTypeScope():void
             $this->typeScope['safe'][$attribute->columnName] = $attribute->columnName;
         }
     }
+
+    private function wrapDefaultExpression(Expression $dbExpr): Expression
+    {
+        return new class($dbExpr->expression) extends Expression {
+            public function __toString()
+            {
+                return '-yii-db-expression-starts-("' . $this->expression . '")-yii-db-expression-ends-';
+            }
+        };
+    }
 }
diff --git a/src/lib/items/DbModel.php b/src/lib/items/DbModel.php
index 5c33c09b..1586637f 100644
--- a/src/lib/items/DbModel.php
+++ b/src/lib/items/DbModel.php
@@ -13,7 +13,6 @@
 use yii\base\BaseObject;
 use yii\db\ColumnSchema;
 use yii\helpers\Inflector;
-use yii\helpers\StringHelper;
 use yii\helpers\VarDumper;
 use function array_filter;
 use function array_map;
@@ -109,7 +108,8 @@ public function getValidationRules():string
         $rules = Yii::createObject(ValidationRulesBuilder::class, [$this])->build();
         $rules = array_map('strval', $rules);
         $rules = VarDumper::export($rules);
-        return str_replace([
+
+        $rules = str_replace([
             PHP_EOL,
             "\'",
             "'[[",
@@ -120,6 +120,15 @@ public function getValidationRules():string
             '[[',
             '],'
         ], $rules);
+
+        // https://github.com/php-openapi/yii2-openapi/issues/65
+        $rules = str_replace(
+            ["'value' => '-yii-db-expression-starts-", "-yii-db-expression-ends-'"],
+            ["'value' => new \yii\db\Expression", ""],
+            $rules,
+        );
+
+        return $rules;
     }
 
     /**
diff --git a/tests/specs/blog/models/base/User.php b/tests/specs/blog/models/base/User.php
index c7023d15..a2cff815 100644
--- a/tests/specs/blog/models/base/User.php
+++ b/tests/specs/blog/models/base/User.php
@@ -41,6 +41,7 @@ public function rules()
             'flags_integer' => [['flags'], 'integer'],
             'flags_default' => [['flags'], 'default', 'value' => 0],
             'created_at_datetime' => [['created_at'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'created_at_default' => [['created_at'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
         ];
     }
 }
diff --git a/tests/specs/x_db_default_expression/maria/edit/app/models/Fruit.php b/tests/specs/x_db_default_expression/maria/edit/app/models/Fruit.php
new file mode 100644
index 00000000..c74c53d9
--- /dev/null
+++ b/tests/specs/x_db_default_expression/maria/edit/app/models/Fruit.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Fruit extends \app\models\base\Fruit
+{
+
+
+}
+
diff --git a/tests/specs/x_db_default_expression/maria/edit/app/models/base/Fruit.php b/tests/specs/x_db_default_expression/maria/edit/app/models/base/Fruit.php
new file mode 100644
index 00000000..77c97900
--- /dev/null
+++ b/tests/specs/x_db_default_expression/maria/edit/app/models/base/Fruit.php
@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * x-db-default-expression test
+ *
+ * @property string $ts
+ * @property string $ts2
+ * @property string $ts3
+ * @property string $ts4
+ * @property string $ts5
+ * @property string $ts6
+ * @property string $d
+ * @property string $d2
+ * @property string $d3
+ * @property string $ts7
+ *
+ */
+abstract class Fruit extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%fruits}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'trim' => [['ts', 'ts2', 'ts3', 'ts4', 'ts5', 'ts6', 'd', 'd2', 'd3', 'ts7'], 'trim'],
+            'ts_datetime' => [['ts'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts_default' => [['ts'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts2_datetime' => [['ts2'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts2_default' => [['ts2'], 'default', 'value' => '2011-11-11 00:00:00'],
+            'ts3_datetime' => [['ts3'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts3_default' => [['ts3'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts4_string' => [['ts4'], 'string'],
+            'ts4_default' => [['ts4'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts5_string' => [['ts5'], 'string'],
+            'ts5_default' => [['ts5'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts6_string' => [['ts6'], 'string'],
+            'ts6_default' => [['ts6'], 'default', 'value' => '2000-11-11 00:00:00'],
+            'd_date' => [['d'], 'date', 'format' => 'php:Y-m-d'],
+            'd_default' => [['d'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd2_string' => [['d2'], 'string'],
+            'd2_default' => [['d2'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd3_string' => [['d3'], 'string'],
+            'd3_default' => [['d3'], 'default', 'value' => 'text default'],
+            'ts7_date' => [['ts7'], 'date', 'format' => 'php:Y-m-d'],
+            'ts7_default' => [['ts7'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+        ];
+    }
+}
diff --git a/tests/specs/x_db_default_expression/maria/edit_expression/app/models/Fruit.php b/tests/specs/x_db_default_expression/maria/edit_expression/app/models/Fruit.php
new file mode 100644
index 00000000..c74c53d9
--- /dev/null
+++ b/tests/specs/x_db_default_expression/maria/edit_expression/app/models/Fruit.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Fruit extends \app\models\base\Fruit
+{
+
+
+}
+
diff --git a/tests/specs/x_db_default_expression/maria/edit_expression/app/models/base/Fruit.php b/tests/specs/x_db_default_expression/maria/edit_expression/app/models/base/Fruit.php
new file mode 100644
index 00000000..77c97900
--- /dev/null
+++ b/tests/specs/x_db_default_expression/maria/edit_expression/app/models/base/Fruit.php
@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * x-db-default-expression test
+ *
+ * @property string $ts
+ * @property string $ts2
+ * @property string $ts3
+ * @property string $ts4
+ * @property string $ts5
+ * @property string $ts6
+ * @property string $d
+ * @property string $d2
+ * @property string $d3
+ * @property string $ts7
+ *
+ */
+abstract class Fruit extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%fruits}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'trim' => [['ts', 'ts2', 'ts3', 'ts4', 'ts5', 'ts6', 'd', 'd2', 'd3', 'ts7'], 'trim'],
+            'ts_datetime' => [['ts'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts_default' => [['ts'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts2_datetime' => [['ts2'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts2_default' => [['ts2'], 'default', 'value' => '2011-11-11 00:00:00'],
+            'ts3_datetime' => [['ts3'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts3_default' => [['ts3'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts4_string' => [['ts4'], 'string'],
+            'ts4_default' => [['ts4'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts5_string' => [['ts5'], 'string'],
+            'ts5_default' => [['ts5'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts6_string' => [['ts6'], 'string'],
+            'ts6_default' => [['ts6'], 'default', 'value' => '2000-11-11 00:00:00'],
+            'd_date' => [['d'], 'date', 'format' => 'php:Y-m-d'],
+            'd_default' => [['d'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd2_string' => [['d2'], 'string'],
+            'd2_default' => [['d2'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd3_string' => [['d3'], 'string'],
+            'd3_default' => [['d3'], 'default', 'value' => 'text default'],
+            'ts7_date' => [['ts7'], 'date', 'format' => 'php:Y-m-d'],
+            'ts7_default' => [['ts7'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+        ];
+    }
+}
diff --git a/tests/specs/x_db_default_expression/maria/simple/app/models/Fruit.php b/tests/specs/x_db_default_expression/maria/simple/app/models/Fruit.php
new file mode 100644
index 00000000..c74c53d9
--- /dev/null
+++ b/tests/specs/x_db_default_expression/maria/simple/app/models/Fruit.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Fruit extends \app\models\base\Fruit
+{
+
+
+}
+
diff --git a/tests/specs/x_db_default_expression/maria/simple/app/models/base/Fruit.php b/tests/specs/x_db_default_expression/maria/simple/app/models/base/Fruit.php
new file mode 100644
index 00000000..77c97900
--- /dev/null
+++ b/tests/specs/x_db_default_expression/maria/simple/app/models/base/Fruit.php
@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * x-db-default-expression test
+ *
+ * @property string $ts
+ * @property string $ts2
+ * @property string $ts3
+ * @property string $ts4
+ * @property string $ts5
+ * @property string $ts6
+ * @property string $d
+ * @property string $d2
+ * @property string $d3
+ * @property string $ts7
+ *
+ */
+abstract class Fruit extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%fruits}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'trim' => [['ts', 'ts2', 'ts3', 'ts4', 'ts5', 'ts6', 'd', 'd2', 'd3', 'ts7'], 'trim'],
+            'ts_datetime' => [['ts'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts_default' => [['ts'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts2_datetime' => [['ts2'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts2_default' => [['ts2'], 'default', 'value' => '2011-11-11 00:00:00'],
+            'ts3_datetime' => [['ts3'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts3_default' => [['ts3'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts4_string' => [['ts4'], 'string'],
+            'ts4_default' => [['ts4'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts5_string' => [['ts5'], 'string'],
+            'ts5_default' => [['ts5'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts6_string' => [['ts6'], 'string'],
+            'ts6_default' => [['ts6'], 'default', 'value' => '2000-11-11 00:00:00'],
+            'd_date' => [['d'], 'date', 'format' => 'php:Y-m-d'],
+            'd_default' => [['d'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd2_string' => [['d2'], 'string'],
+            'd2_default' => [['d2'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd3_string' => [['d3'], 'string'],
+            'd3_default' => [['d3'], 'default', 'value' => 'text default'],
+            'ts7_date' => [['ts7'], 'date', 'format' => 'php:Y-m-d'],
+            'ts7_default' => [['ts7'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+        ];
+    }
+}
diff --git a/tests/specs/x_db_default_expression/mysql/edit/app/models/Fruit.php b/tests/specs/x_db_default_expression/mysql/edit/app/models/Fruit.php
new file mode 100644
index 00000000..c74c53d9
--- /dev/null
+++ b/tests/specs/x_db_default_expression/mysql/edit/app/models/Fruit.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Fruit extends \app\models\base\Fruit
+{
+
+
+}
+
diff --git a/tests/specs/x_db_default_expression/mysql/edit/app/models/base/Fruit.php b/tests/specs/x_db_default_expression/mysql/edit/app/models/base/Fruit.php
new file mode 100644
index 00000000..77c97900
--- /dev/null
+++ b/tests/specs/x_db_default_expression/mysql/edit/app/models/base/Fruit.php
@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * x-db-default-expression test
+ *
+ * @property string $ts
+ * @property string $ts2
+ * @property string $ts3
+ * @property string $ts4
+ * @property string $ts5
+ * @property string $ts6
+ * @property string $d
+ * @property string $d2
+ * @property string $d3
+ * @property string $ts7
+ *
+ */
+abstract class Fruit extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%fruits}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'trim' => [['ts', 'ts2', 'ts3', 'ts4', 'ts5', 'ts6', 'd', 'd2', 'd3', 'ts7'], 'trim'],
+            'ts_datetime' => [['ts'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts_default' => [['ts'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts2_datetime' => [['ts2'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts2_default' => [['ts2'], 'default', 'value' => '2011-11-11 00:00:00'],
+            'ts3_datetime' => [['ts3'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts3_default' => [['ts3'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts4_string' => [['ts4'], 'string'],
+            'ts4_default' => [['ts4'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts5_string' => [['ts5'], 'string'],
+            'ts5_default' => [['ts5'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts6_string' => [['ts6'], 'string'],
+            'ts6_default' => [['ts6'], 'default', 'value' => '2000-11-11 00:00:00'],
+            'd_date' => [['d'], 'date', 'format' => 'php:Y-m-d'],
+            'd_default' => [['d'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd2_string' => [['d2'], 'string'],
+            'd2_default' => [['d2'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd3_string' => [['d3'], 'string'],
+            'd3_default' => [['d3'], 'default', 'value' => 'text default'],
+            'ts7_date' => [['ts7'], 'date', 'format' => 'php:Y-m-d'],
+            'ts7_default' => [['ts7'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+        ];
+    }
+}
diff --git a/tests/specs/x_db_default_expression/mysql/edit_expression/app/models/Fruit.php b/tests/specs/x_db_default_expression/mysql/edit_expression/app/models/Fruit.php
new file mode 100644
index 00000000..c74c53d9
--- /dev/null
+++ b/tests/specs/x_db_default_expression/mysql/edit_expression/app/models/Fruit.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Fruit extends \app\models\base\Fruit
+{
+
+
+}
+
diff --git a/tests/specs/x_db_default_expression/mysql/edit_expression/app/models/base/Fruit.php b/tests/specs/x_db_default_expression/mysql/edit_expression/app/models/base/Fruit.php
new file mode 100644
index 00000000..77c97900
--- /dev/null
+++ b/tests/specs/x_db_default_expression/mysql/edit_expression/app/models/base/Fruit.php
@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * x-db-default-expression test
+ *
+ * @property string $ts
+ * @property string $ts2
+ * @property string $ts3
+ * @property string $ts4
+ * @property string $ts5
+ * @property string $ts6
+ * @property string $d
+ * @property string $d2
+ * @property string $d3
+ * @property string $ts7
+ *
+ */
+abstract class Fruit extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%fruits}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'trim' => [['ts', 'ts2', 'ts3', 'ts4', 'ts5', 'ts6', 'd', 'd2', 'd3', 'ts7'], 'trim'],
+            'ts_datetime' => [['ts'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts_default' => [['ts'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts2_datetime' => [['ts2'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts2_default' => [['ts2'], 'default', 'value' => '2011-11-11 00:00:00'],
+            'ts3_datetime' => [['ts3'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts3_default' => [['ts3'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts4_string' => [['ts4'], 'string'],
+            'ts4_default' => [['ts4'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts5_string' => [['ts5'], 'string'],
+            'ts5_default' => [['ts5'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts6_string' => [['ts6'], 'string'],
+            'ts6_default' => [['ts6'], 'default', 'value' => '2000-11-11 00:00:00'],
+            'd_date' => [['d'], 'date', 'format' => 'php:Y-m-d'],
+            'd_default' => [['d'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd2_string' => [['d2'], 'string'],
+            'd2_default' => [['d2'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd3_string' => [['d3'], 'string'],
+            'd3_default' => [['d3'], 'default', 'value' => 'text default'],
+            'ts7_date' => [['ts7'], 'date', 'format' => 'php:Y-m-d'],
+            'ts7_default' => [['ts7'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+        ];
+    }
+}
diff --git a/tests/specs/x_db_default_expression/mysql/simple/app/models/Fruit.php b/tests/specs/x_db_default_expression/mysql/simple/app/models/Fruit.php
new file mode 100644
index 00000000..c74c53d9
--- /dev/null
+++ b/tests/specs/x_db_default_expression/mysql/simple/app/models/Fruit.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Fruit extends \app\models\base\Fruit
+{
+
+
+}
+
diff --git a/tests/specs/x_db_default_expression/mysql/simple/app/models/base/Fruit.php b/tests/specs/x_db_default_expression/mysql/simple/app/models/base/Fruit.php
new file mode 100644
index 00000000..77c97900
--- /dev/null
+++ b/tests/specs/x_db_default_expression/mysql/simple/app/models/base/Fruit.php
@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * x-db-default-expression test
+ *
+ * @property string $ts
+ * @property string $ts2
+ * @property string $ts3
+ * @property string $ts4
+ * @property string $ts5
+ * @property string $ts6
+ * @property string $d
+ * @property string $d2
+ * @property string $d3
+ * @property string $ts7
+ *
+ */
+abstract class Fruit extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%fruits}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'trim' => [['ts', 'ts2', 'ts3', 'ts4', 'ts5', 'ts6', 'd', 'd2', 'd3', 'ts7'], 'trim'],
+            'ts_datetime' => [['ts'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts_default' => [['ts'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts2_datetime' => [['ts2'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts2_default' => [['ts2'], 'default', 'value' => '2011-11-11 00:00:00'],
+            'ts3_datetime' => [['ts3'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts3_default' => [['ts3'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts4_string' => [['ts4'], 'string'],
+            'ts4_default' => [['ts4'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts5_string' => [['ts5'], 'string'],
+            'ts5_default' => [['ts5'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts6_string' => [['ts6'], 'string'],
+            'ts6_default' => [['ts6'], 'default', 'value' => '2000-11-11 00:00:00'],
+            'd_date' => [['d'], 'date', 'format' => 'php:Y-m-d'],
+            'd_default' => [['d'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd2_string' => [['d2'], 'string'],
+            'd2_default' => [['d2'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd3_string' => [['d3'], 'string'],
+            'd3_default' => [['d3'], 'default', 'value' => 'text default'],
+            'ts7_date' => [['ts7'], 'date', 'format' => 'php:Y-m-d'],
+            'ts7_default' => [['ts7'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+        ];
+    }
+}
diff --git a/tests/specs/x_db_default_expression/mysql/x_db_default_expression_mysql.php b/tests/specs/x_db_default_expression/mysql/x_db_default_expression_mysql.php
index 5fd47d1b..dc4ebbb8 100644
--- a/tests/specs/x_db_default_expression/mysql/x_db_default_expression_mysql.php
+++ b/tests/specs/x_db_default_expression/mysql/x_db_default_expression_mysql.php
@@ -3,7 +3,7 @@
 return [
     'openApiPath' => '@specs/x_db_default_expression/mysql/x_db_default_expression_mysql.yaml',
     'generateUrls' => false,
-    'generateModels' => false,
+    'generateModels' => true,
     'excludeModels' => [
         'Error',
     ],
diff --git a/tests/specs/x_db_default_expression/pgsql/edit/app/models/Fruit.php b/tests/specs/x_db_default_expression/pgsql/edit/app/models/Fruit.php
new file mode 100644
index 00000000..c74c53d9
--- /dev/null
+++ b/tests/specs/x_db_default_expression/pgsql/edit/app/models/Fruit.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Fruit extends \app\models\base\Fruit
+{
+
+
+}
+
diff --git a/tests/specs/x_db_default_expression/pgsql/edit/app/models/base/Fruit.php b/tests/specs/x_db_default_expression/pgsql/edit/app/models/base/Fruit.php
new file mode 100644
index 00000000..77c97900
--- /dev/null
+++ b/tests/specs/x_db_default_expression/pgsql/edit/app/models/base/Fruit.php
@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * x-db-default-expression test
+ *
+ * @property string $ts
+ * @property string $ts2
+ * @property string $ts3
+ * @property string $ts4
+ * @property string $ts5
+ * @property string $ts6
+ * @property string $d
+ * @property string $d2
+ * @property string $d3
+ * @property string $ts7
+ *
+ */
+abstract class Fruit extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%fruits}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'trim' => [['ts', 'ts2', 'ts3', 'ts4', 'ts5', 'ts6', 'd', 'd2', 'd3', 'ts7'], 'trim'],
+            'ts_datetime' => [['ts'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts_default' => [['ts'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts2_datetime' => [['ts2'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts2_default' => [['ts2'], 'default', 'value' => '2011-11-11 00:00:00'],
+            'ts3_datetime' => [['ts3'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts3_default' => [['ts3'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts4_string' => [['ts4'], 'string'],
+            'ts4_default' => [['ts4'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts5_string' => [['ts5'], 'string'],
+            'ts5_default' => [['ts5'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts6_string' => [['ts6'], 'string'],
+            'ts6_default' => [['ts6'], 'default', 'value' => '2000-11-11 00:00:00'],
+            'd_date' => [['d'], 'date', 'format' => 'php:Y-m-d'],
+            'd_default' => [['d'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd2_string' => [['d2'], 'string'],
+            'd2_default' => [['d2'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd3_string' => [['d3'], 'string'],
+            'd3_default' => [['d3'], 'default', 'value' => 'text default'],
+            'ts7_date' => [['ts7'], 'date', 'format' => 'php:Y-m-d'],
+            'ts7_default' => [['ts7'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+        ];
+    }
+}
diff --git a/tests/specs/x_db_default_expression/pgsql/edit_expression/app/models/Fruit.php b/tests/specs/x_db_default_expression/pgsql/edit_expression/app/models/Fruit.php
new file mode 100644
index 00000000..c74c53d9
--- /dev/null
+++ b/tests/specs/x_db_default_expression/pgsql/edit_expression/app/models/Fruit.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Fruit extends \app\models\base\Fruit
+{
+
+
+}
+
diff --git a/tests/specs/x_db_default_expression/pgsql/edit_expression/app/models/base/Fruit.php b/tests/specs/x_db_default_expression/pgsql/edit_expression/app/models/base/Fruit.php
new file mode 100644
index 00000000..77c97900
--- /dev/null
+++ b/tests/specs/x_db_default_expression/pgsql/edit_expression/app/models/base/Fruit.php
@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * x-db-default-expression test
+ *
+ * @property string $ts
+ * @property string $ts2
+ * @property string $ts3
+ * @property string $ts4
+ * @property string $ts5
+ * @property string $ts6
+ * @property string $d
+ * @property string $d2
+ * @property string $d3
+ * @property string $ts7
+ *
+ */
+abstract class Fruit extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%fruits}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'trim' => [['ts', 'ts2', 'ts3', 'ts4', 'ts5', 'ts6', 'd', 'd2', 'd3', 'ts7'], 'trim'],
+            'ts_datetime' => [['ts'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts_default' => [['ts'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts2_datetime' => [['ts2'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts2_default' => [['ts2'], 'default', 'value' => '2011-11-11 00:00:00'],
+            'ts3_datetime' => [['ts3'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts3_default' => [['ts3'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts4_string' => [['ts4'], 'string'],
+            'ts4_default' => [['ts4'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts5_string' => [['ts5'], 'string'],
+            'ts5_default' => [['ts5'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts6_string' => [['ts6'], 'string'],
+            'ts6_default' => [['ts6'], 'default', 'value' => '2000-11-11 00:00:00'],
+            'd_date' => [['d'], 'date', 'format' => 'php:Y-m-d'],
+            'd_default' => [['d'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd2_string' => [['d2'], 'string'],
+            'd2_default' => [['d2'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd3_string' => [['d3'], 'string'],
+            'd3_default' => [['d3'], 'default', 'value' => 'text default'],
+            'ts7_date' => [['ts7'], 'date', 'format' => 'php:Y-m-d'],
+            'ts7_default' => [['ts7'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+        ];
+    }
+}
diff --git a/tests/specs/x_db_default_expression/pgsql/simple/app/models/Fruit.php b/tests/specs/x_db_default_expression/pgsql/simple/app/models/Fruit.php
new file mode 100644
index 00000000..c74c53d9
--- /dev/null
+++ b/tests/specs/x_db_default_expression/pgsql/simple/app/models/Fruit.php
@@ -0,0 +1,10 @@
+<?php
+
+namespace app\models;
+
+class Fruit extends \app\models\base\Fruit
+{
+
+
+}
+
diff --git a/tests/specs/x_db_default_expression/pgsql/simple/app/models/base/Fruit.php b/tests/specs/x_db_default_expression/pgsql/simple/app/models/base/Fruit.php
new file mode 100644
index 00000000..77c97900
--- /dev/null
+++ b/tests/specs/x_db_default_expression/pgsql/simple/app/models/base/Fruit.php
@@ -0,0 +1,57 @@
+<?php
+
+/**
+ * This file is generated by Gii, do not change manually!
+ */
+
+namespace app\models\base;
+
+/**
+ * x-db-default-expression test
+ *
+ * @property string $ts
+ * @property string $ts2
+ * @property string $ts3
+ * @property string $ts4
+ * @property string $ts5
+ * @property string $ts6
+ * @property string $d
+ * @property string $d2
+ * @property string $d3
+ * @property string $ts7
+ *
+ */
+abstract class Fruit extends \yii\db\ActiveRecord
+{
+    public static function tableName()
+    {
+        return '{{%fruits}}';
+    }
+
+    public function rules()
+    {
+        return [
+            'trim' => [['ts', 'ts2', 'ts3', 'ts4', 'ts5', 'ts6', 'd', 'd2', 'd3', 'ts7'], 'trim'],
+            'ts_datetime' => [['ts'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts_default' => [['ts'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts2_datetime' => [['ts2'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts2_default' => [['ts2'], 'default', 'value' => '2011-11-11 00:00:00'],
+            'ts3_datetime' => [['ts3'], 'datetime', 'format' => 'php:Y-m-d H:i:s'],
+            'ts3_default' => [['ts3'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts4_string' => [['ts4'], 'string'],
+            'ts4_default' => [['ts4'], 'default', 'value' => '2022-11-11 00:00:00'],
+            'ts5_string' => [['ts5'], 'string'],
+            'ts5_default' => [['ts5'], 'default', 'value' => new \yii\db\Expression("(CURRENT_TIMESTAMP)")],
+            'ts6_string' => [['ts6'], 'string'],
+            'ts6_default' => [['ts6'], 'default', 'value' => '2000-11-11 00:00:00'],
+            'd_date' => [['d'], 'date', 'format' => 'php:Y-m-d'],
+            'd_default' => [['d'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd2_string' => [['d2'], 'string'],
+            'd2_default' => [['d2'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+            'd3_string' => [['d3'], 'string'],
+            'd3_default' => [['d3'], 'default', 'value' => 'text default'],
+            'ts7_date' => [['ts7'], 'date', 'format' => 'php:Y-m-d'],
+            'ts7_default' => [['ts7'], 'default', 'value' => new \yii\db\Expression("(CURRENT_DATE + INTERVAL 1 YEAR)")],
+        ];
+    }
+}