diff --git a/Makefile b/Makefile
index b31f823..9a60730 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,14 @@
 # set user to "root" to run commands as root in docker
 USER=$$(whoami)
 # The docker command to execute commands directly in docker
-DOCKER=docker-compose exec --user=$(USER) backend-php
+DOCKER=docker-compose exec -T --user="$(USER)" backend-php
 # The PHP binary to use, you may add arguments to PHP here
 PHP=php
 # directories writeable by webserver
 WRITEABLE_DIRS=/app/runtime /app/logs /app/backend/web/assets
 
+TESTCASE=
+COMMAND=
 
 # default target lists general usage information
 default:
@@ -43,7 +45,10 @@ stop:
 # run bash inside docker container
 bash: cli
 cli:
-	$(DOCKER) bash
+	docker-compose exec --user="$(USER)" backend-php bash
+
+run:
+	$(DOCKER) sh -c '$(COMMAND)'
 
 start-docker: docker-compose.override.yml runtime/build-docker config/components-dev.local.php backend/config/cookie-validation.key env.php stop
 	docker-compose up -d
@@ -79,7 +84,7 @@ backend/config/cookie-validation.key:
 ## Docker Runtime Tests ##
 
 test: tests/_data/dump.sql
-	$(DOCKER) vendor/bin/codecept run
+	$(DOCKER) vendor/bin/codecept run $(TESTCASE)
 
 clean:
 	rm -rf tests/_data/dump.sql
diff --git a/README.md b/README.md
index 3828272..694f5a1 100644
--- a/README.md
+++ b/README.md
@@ -196,6 +196,18 @@ The following list explains the directory structure in more detail:
 - `logs/` - log files
 - `runtime/` - temporary runtime files
 
+
+# Development
+
+Below commands are helpful while developing this project:
+
+```bash
+./yii gii/api --openApiPath=/app/openapi/schema.yaml --generateMigrations=0  --generateControllers=0 --generateUrls=0
+
+./yii gii/api --openApiPath=/app/openapi/schema.yaml --generateMigrations=1  --generateControllers=0 --generateUrls=0 --generateModels=0 --generateModelFaker=0
+```
+
+
 # Support
 
 **Need help with your API project?**
diff --git a/api/config/xdebug.ini b/api/config/xdebug.ini
new file mode 100644
index 0000000..d34bbc7
--- /dev/null
+++ b/api/config/xdebug.ini
@@ -0,0 +1,9 @@
+;zend_extension=xdebug.so
+xdebug.mode=debug
+xdebug.start_with_request=yes
+;;; if you are on macOS, use host.docker.internal to identify the host machine, due to a network limitation on mac (https://docs.docker.com/docker-for-mac/networking/#port-mapping)
+;;; otherwise find host ip
+xdebug.discover_client_host=yes
+xdebug.client_host=host.docker.internal
+xdebug.client_port=9003
+xdebug.idekey=XDEBUG_API
diff --git a/backend/config/xdebug.ini b/backend/config/xdebug.ini
new file mode 100644
index 0000000..ec55ea6
--- /dev/null
+++ b/backend/config/xdebug.ini
@@ -0,0 +1,9 @@
+;zend_extension=xdebug.so
+xdebug.mode=debug
+xdebug.start_with_request=yes
+;;; if you are on macOS, use host.docker.internal to identify the host machine, due to a network limitation on mac (https://docs.docker.com/docker-for-mac/networking/#port-mapping)
+;;; otherwise find host ip
+xdebug.discover_client_host=yes
+xdebug.client_host=host.docker.internal
+xdebug.client_port=9003
+xdebug.idekey=XDEBUG_BACKEND
diff --git a/backend/views/site/error.php b/backend/views/site/error.php
new file mode 100644
index 0000000..4a37b25
--- /dev/null
+++ b/backend/views/site/error.php
@@ -0,0 +1,27 @@
+<?php
+
+/** @var yii\web\View $this */
+/** @var string $name */
+/** @var string $message */
+/** @var Exception$exception */
+
+use yii\helpers\Html;
+
+$this->title = $name;
+?>
+<div class="site-error">
+
+    <h1><?= Html::encode($this->title) ?></h1>
+
+    <div class="alert alert-danger">
+        <?= nl2br(Html::encode($message)) ?>
+    </div>
+
+    <p>
+        The above error occurred while the Web server was processing your request.
+    </p>
+    <p>
+        Please contact us if you think this is a server error. Thank you.
+    </p>
+
+</div>
diff --git a/composer.json b/composer.json
index b2394fb..735bbdd 100644
--- a/composer.json
+++ b/composer.json
@@ -28,7 +28,7 @@
     },
     "config": {
         "platform": {
-            "php": "7.1.3"
+            "php": "7.4.26"
         },
         "fxp-asset": {
             "enabled": false
diff --git a/config/gii-generators.php b/config/gii-generators.php
index a890af5..fe63a72 100644
--- a/config/gii-generators.php
+++ b/config/gii-generators.php
@@ -11,6 +11,5 @@
         'modelNamespace' => 'common\\models',
         'fakerNamespace' => 'common\\models\\faker',
         'migrationPath' => '@common/migrations',
-
     ],
 ];
diff --git a/console/commands/FakerController.php b/console/commands/FakerController.php
index e384159..8cf8b65 100644
--- a/console/commands/FakerController.php
+++ b/console/commands/FakerController.php
@@ -4,7 +4,7 @@
 
 use yii\console\Controller;
 use yii\helpers\Console;
-use yii\helpers\FileHelper;
+use yii\helpers\{FileHelper, VarDumper};
 use yii\helpers\StringHelper;
 
 /**
@@ -16,11 +16,14 @@ public function actionIndex()
     {
         $fakers = FileHelper::findFiles(\Yii::getAlias('@common/models'), [
             'only' => ['*Faker.php'],
+            'except' => ['BaseModelFaker.php'],
         ]);
 
-        foreach($fakers as $fakerFile) {
-            $className = 'common\\models\\' . StringHelper::basename($fakerFile, '.php');
-            $this->stdout('Generating fake data for ' . StringHelper::basename($fakerFile, 'Faker.php') . '...');
+        $sortedFakersModels = static::sortModels($fakers, '\\common\\models\\faker\\');
+
+        foreach($sortedFakersModels as $justModelClassName) {
+            $className = 'common\\models\\faker\\' . StringHelper::basename($justModelClassName, '.php').'Faker';
+            $this->stdout('Generating fake data for ' . StringHelper::basename($justModelClassName, 'Faker.php') . '...');
             $faker = new $className;
             for($i = 0; $i < 10; $i++) {
                 $model = $faker->generateModel();
@@ -32,4 +35,70 @@ public function actionIndex()
             $this->stdout("done.\n", Console::BOLD, Console::FG_GREEN);
         }
     }
+
+    public static function sortModels(array $fakers, string $fakerNamespace = 'app\\models\\')
+    {
+        $modelsDependencies = [];
+        foreach($fakers as $fakerFile) {
+            $className = $fakerNamespace . StringHelper::basename($fakerFile, '.php');
+            $faker = new $className;
+
+            $modelClassName = str_replace(
+                'Faker',
+                '',
+                StringHelper::basename($fakerFile, '.php')
+            );
+
+            if (!method_exists($className, 'dependentOn')) {
+                $modelsDependencies[$modelClassName] = null;
+            } else {
+                $modelsDependencies[$modelClassName] = $className::dependentOn();
+            }
+        }
+
+        $standalone = array_filter($modelsDependencies, function ($elm) {
+            return $elm === null;
+        });
+
+        $dependent = array_filter($modelsDependencies, function ($elm) {
+            return $elm !== null;
+        });
+
+        $justDepenentModels = array_keys($dependent);
+        $sortedDependentModels = $justDepenentModels;
+
+        foreach ($justDepenentModels as $model) {
+            if ($modelsDependencies[$model] !== null) {
+                foreach ($modelsDependencies[$model] as $dependentOn) {
+                    if ($modelsDependencies[$dependentOn] !== null) {
+                        // move $dependentOn before $model
+
+                        // move model to sort/order
+                        // in that function if it is already before (sorted) then avoid it
+                        static::moveModel($sortedDependentModels, $dependentOn, $model);
+                    }
+                }
+            }
+        }
+
+        $finalSortedModels = array_merge(array_keys($standalone), $sortedDependentModels);
+        return $finalSortedModels;
+    }
+
+    public static function moveModel(&$sortedDependentModels, $dependentOn, $model)
+    {
+        $modelKey = array_search($model, $sortedDependentModels);
+        $depKey = array_search($dependentOn, $sortedDependentModels);
+        if ($depKey < $modelKey) {
+            return;
+        }
+
+        unset($sortedDependentModels[$depKey]);
+
+        $restRight = array_slice($sortedDependentModels, $modelKey);
+        $theKey = (($modelKey) < 0) ? 0 : ($modelKey);
+        $restLeft = array_slice($sortedDependentModels, 0, $theKey);
+
+        $sortedDependentModels = array_merge($restLeft, [$dependentOn], $restRight);
+    }
 }
diff --git a/console/config/components.php b/console/config/components.php
index 4ea56aa..ee095c4 100644
--- a/console/config/components.php
+++ b/console/config/components.php
@@ -7,15 +7,18 @@
 return [
     'log' => [
         'traceLevel' => YII_DEBUG ? 3 : 0,
+        'flushInterval' => 1,
         'targets' => [
             [
                 'class' => yii\log\FileTarget::class,
+                'exportInterval' => 1,
                 'levels' => ['error', 'warning'],
                 'logFile' => '@logs/console-app.error.log',
                 'logVars' => [],
             ],
             [
                 'class' => yii\log\FileTarget::class,
+                'exportInterval' => 1,
                 'levels' => ['info'],
                 'logFile' => '@logs/console-app.info.log',
                 'logVars' => [],
diff --git a/docker-compose.override.dist.yml b/docker-compose.override.dist.yml
index 88a3c6c..2c9b4b4 100644
--- a/docker-compose.override.dist.yml
+++ b/docker-compose.override.dist.yml
@@ -5,15 +5,22 @@
 version: '2'
 services:
   api-php:
+    environment:
+      PHP_ENABLE_XDEBUG: 1
     ports:
       - '8337:80'
+    volumes:
+      - ./api/config/xdebug.ini:/usr/local/etc/php/conf.d/xdebug.ini
 
   backend-php:
+    environment:
+      PHP_ENABLE_XDEBUG: 1
     ports:
       - '8338:80'
     volumes:
       # Re-use local composer cache via host-volume
       - ~/.composer-docker/cache:/root/.composer/cache:delegated
+      - ./backend/config/xdebug.ini:/usr/local/etc/php/conf.d/xdebug.ini
 
   db:
     volumes:
diff --git a/docs/backend-bootstrap4.md b/docs/backend-bootstrap4.md
index dc85056..f18584e 100644
--- a/docs/backend-bootstrap4.md
+++ b/docs/backend-bootstrap4.md
@@ -47,7 +47,7 @@ Steps:
    <!DOCTYPE html>
   ```
   
-- Add a navigation to the mail layout:
+- Add a navigation to the main layout:
 
   ```php
     <?php \yii\bootstrap4\NavBar::begin() ?>
diff --git a/docs/getting-started.md b/docs/getting-started.md
index 6fe79af..ab7cd54 100644
--- a/docs/getting-started.md
+++ b/docs/getting-started.md
@@ -21,6 +21,7 @@ If you don't know how to create OpenAPI descriptions you can check out the follo
 
   - <https://oai.github.io/Documentation/start-here.html>
   - <https://idratherbewriting.com/learnapidoc/pubapis_openapi_tutorial_overview.html>
+  - <https://swagger.io/docs/specification/basic-structure/>
   - ... (if you happen to know better resources to look at, please [let us know](https://github.com/cebe/yii2-app-api/issues/new)
 
 Also check out the [OpenAPI Specification](https://spec.openapis.org/oas/v3.1.0) itself.
diff --git a/openapi/schema.yaml b/openapi/schema.yaml
new file mode 100644
index 0000000..d50402b
--- /dev/null
+++ b/openapi/schema.yaml
@@ -0,0 +1,203 @@
+openapi: 3.0.3
+# Edit this schema and start your project
+# This is sample schema
+# To generate code which is based on this schema
+# run commands mentioned Development section in README.md file
+info:
+  title: 'Proxy-Service'
+  description: ""
+  version: 1.0.0
+  contact:
+    name: '...'
+    email: you@example.com
+servers:
+  - url: 'http://localhost:8937'
+    description: 'Local Dev API'
+security:
+  - BasicAuth: []
+components:
+  securitySchemes:
+    BasicAuth:
+      type: http
+      scheme: basic
+  schemas:
+    Account:
+      description: user account
+      type: object
+      required:
+        - id
+        - name
+      properties:
+        id:
+          type: integer
+        name:
+          description: account name
+          type: string
+          maxLength: 40
+          x-faker: 'substr($faker->userName(), 0, 40)'
+
+    Domain:
+      description: domain
+      type: object
+      required:
+        - id
+        - name
+        - account
+        - created_at
+      properties:
+        id:
+          type: integer
+        name:
+          description: domain or sub-domain name, in DNS syntax, IDN are converted
+          type: string
+          maxLength: 128
+          x-faker: '$faker->domainName'
+        account:
+          $ref: '#/components/schemas/Account'
+
+        routings:
+          type: array
+          items:
+            $ref: '#/components/schemas/Routing'
+
+        created_at:
+          readOnly: true
+          type: string
+          format: datetime
+          x-db-type: datetime
+          nullable: false
+
+    Routing:
+      description: rounting specification
+      type: object
+      required:
+        - id
+        - domain
+      properties:
+        id:
+          type: integer
+        domain:
+          $ref: '#/components/schemas/Domain'
+        path:
+          type: string
+          maxLength: 255
+          x-faker: '$faker->randomElement(["/", "/", "/", "/", "/api", "/tools", "/assets/web"])'
+
+        ssl:
+          type: boolean
+        redirect_to_ssl:
+          type: boolean
+
+        service:
+          type: string
+          maxLength: 255
+          x-faker: '"http://tador.cebe.net/" . $faker->domainName'
+
+        created_at:
+          readOnly: true
+          type: string
+          format: datetime
+          x-db-type: datetime
+          nullable: true
+        d123:
+          $ref: '#/components/schemas/D123'
+        a123:
+          $ref: '#/components/schemas/A123'
+
+    D123:
+      description: desc
+      type: object
+      required:
+        - id
+      properties:
+        id:
+          type: integer
+        name:
+          type: string
+    A123:
+      description: desc
+      type: object
+      required:
+        - id
+      properties:
+        id:
+          type: integer
+        name:
+          type: string
+        b123:
+          $ref: '#/components/schemas/B123'
+    B123:
+      description: desc
+      type: object
+      required:
+        - id
+      properties:
+        id:
+          type: integer
+        name:
+          type: string
+        c123:
+          $ref: '#/components/schemas/C123'
+    C123:
+      description: desc
+      type: object
+      required:
+        - id
+      properties:
+        id:
+          type: integer
+        name:
+          type: string
+    E123:
+      description: desc
+      type: object
+      required:
+        - id
+      properties:
+        id:
+          type: integer
+        name:
+          type: string
+        b123:
+          $ref: '#/components/schemas/B123'
+
+
+paths:
+  /:
+    get:
+      responses: []
+      description: none
+
+
+
+# Dependencies:
+# 'E123' => [
+#     0 => 'B123'
+# ]
+# 'Account' => null
+# 'C123' => null
+# 'Domain' => [
+#     0 => 'Account'
+# ]
+# 'B123' => [
+#     0 => 'C123'
+# ]
+# 'Routing' => [
+#     0 => 'Domain'
+#     1 => 'D123'
+#     2 => 'A123'
+# ]
+# 'D123' => null
+# 'A123' => [
+#     0 => 'B123'
+# ]
+
+# Sorted:
+# 'Account',
+# 'C123',
+# 'D123',
+# 'B123',
+# 'E123',
+# 'Domain',
+# 'A123',
+# 'Routing',