Why does adding constructor parameters require my to clear /generated












0















I'm using Magento 2.2 in development mode.



I have a controller class



class MyController
{
public function __construct(
MagentoFrameworkAppActionContext $context,
MagentoFrameworkMessageManagerInterface $messageManager)
{
// stuff
}
}


That works correctly. However, if I add an additional constructor parameter like this:



class MyController
{
public function __construct(
MagentoFrameworkAppActionContext $context,
MagentoFrameworkViewResultPageFactory $resultPageFactory,
MagentoFrameworkMessageManagerInterface $messageManager)
{
// stuff
}
}


I get the error



PHP Fatal error: Uncaught TypeError: Argument 2 passed to
BenTestingControllerTest::__construct() must be an instance of
MagentoFrameworkViewResultPageFactory, instance of
MagentoFrameworkMessageManagerInterface given, called in
/magento-dev/magento2/generated/code/Ben/Testing/Controller/Test/Interceptor.php
on line 7 and defined in /magento-dev/magento2/app/code/Ben/Testing/Controller/Test.php:7
...


If I clear the /generated folder and refresh the page, it works.



My question is about how Magento handles caching and generated code. I can add additional code to non-constructor functions without needing to clear /generated, and it works. Why does that work, but adding additional constructor parameters requires me to clear the /generated folder?









share



























    0















    I'm using Magento 2.2 in development mode.



    I have a controller class



    class MyController
    {
    public function __construct(
    MagentoFrameworkAppActionContext $context,
    MagentoFrameworkMessageManagerInterface $messageManager)
    {
    // stuff
    }
    }


    That works correctly. However, if I add an additional constructor parameter like this:



    class MyController
    {
    public function __construct(
    MagentoFrameworkAppActionContext $context,
    MagentoFrameworkViewResultPageFactory $resultPageFactory,
    MagentoFrameworkMessageManagerInterface $messageManager)
    {
    // stuff
    }
    }


    I get the error



    PHP Fatal error: Uncaught TypeError: Argument 2 passed to
    BenTestingControllerTest::__construct() must be an instance of
    MagentoFrameworkViewResultPageFactory, instance of
    MagentoFrameworkMessageManagerInterface given, called in
    /magento-dev/magento2/generated/code/Ben/Testing/Controller/Test/Interceptor.php
    on line 7 and defined in /magento-dev/magento2/app/code/Ben/Testing/Controller/Test.php:7
    ...


    If I clear the /generated folder and refresh the page, it works.



    My question is about how Magento handles caching and generated code. I can add additional code to non-constructor functions without needing to clear /generated, and it works. Why does that work, but adding additional constructor parameters requires me to clear the /generated folder?









    share

























      0












      0








      0








      I'm using Magento 2.2 in development mode.



      I have a controller class



      class MyController
      {
      public function __construct(
      MagentoFrameworkAppActionContext $context,
      MagentoFrameworkMessageManagerInterface $messageManager)
      {
      // stuff
      }
      }


      That works correctly. However, if I add an additional constructor parameter like this:



      class MyController
      {
      public function __construct(
      MagentoFrameworkAppActionContext $context,
      MagentoFrameworkViewResultPageFactory $resultPageFactory,
      MagentoFrameworkMessageManagerInterface $messageManager)
      {
      // stuff
      }
      }


      I get the error



      PHP Fatal error: Uncaught TypeError: Argument 2 passed to
      BenTestingControllerTest::__construct() must be an instance of
      MagentoFrameworkViewResultPageFactory, instance of
      MagentoFrameworkMessageManagerInterface given, called in
      /magento-dev/magento2/generated/code/Ben/Testing/Controller/Test/Interceptor.php
      on line 7 and defined in /magento-dev/magento2/app/code/Ben/Testing/Controller/Test.php:7
      ...


      If I clear the /generated folder and refresh the page, it works.



      My question is about how Magento handles caching and generated code. I can add additional code to non-constructor functions without needing to clear /generated, and it works. Why does that work, but adding additional constructor parameters requires me to clear the /generated folder?









      share














      I'm using Magento 2.2 in development mode.



      I have a controller class



      class MyController
      {
      public function __construct(
      MagentoFrameworkAppActionContext $context,
      MagentoFrameworkMessageManagerInterface $messageManager)
      {
      // stuff
      }
      }


      That works correctly. However, if I add an additional constructor parameter like this:



      class MyController
      {
      public function __construct(
      MagentoFrameworkAppActionContext $context,
      MagentoFrameworkViewResultPageFactory $resultPageFactory,
      MagentoFrameworkMessageManagerInterface $messageManager)
      {
      // stuff
      }
      }


      I get the error



      PHP Fatal error: Uncaught TypeError: Argument 2 passed to
      BenTestingControllerTest::__construct() must be an instance of
      MagentoFrameworkViewResultPageFactory, instance of
      MagentoFrameworkMessageManagerInterface given, called in
      /magento-dev/magento2/generated/code/Ben/Testing/Controller/Test/Interceptor.php
      on line 7 and defined in /magento-dev/magento2/app/code/Ben/Testing/Controller/Test.php:7
      ...


      If I clear the /generated folder and refresh the page, it works.



      My question is about how Magento handles caching and generated code. I can add additional code to non-constructor functions without needing to clear /generated, and it works. Why does that work, but adding additional constructor parameters requires me to clear the /generated folder?







      magento2 php





      share












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      asked 9 mins ago









      Ben RubinBen Rubin

      1012




      1012






















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