Module development and code questions

With pathauto enabled, how can we programmatically set “Generate automatic URL alias” to TRUE for existing nodes, using PHP or SQL?

I have tried all patches and PHP or SQL solutions suggested and nothing has worked for the latest D8 + pathauto releases.

After having studied various options, I believe this could be the fastest way to do it:

Dear everyone,

I've been struggling for almost a week now trying to learn how to implement hook_form_alter in Drupal 8. I've got the Form API module from the examples module and I've been trying to insert hook_form_alter there but Drupal doesn't even see this function.

The routing file looks like this:

hi guys,

please help me how to do to upadate the new entity in my bd.

i use drush entup but nothing

please help me !!!!

hi guys,

i want to explore the ContentEntityType. but when i finish to it. i have some error . the mapping of error is :
Doctrine\Common\Annotations\AnnotationException: [Syntax Error] Expected PlainValue, got ''' at position 66 in class Drupal\mymodule\Entity\Message. in Doctrine\Common\Annotations\AnnotationException::syntaxError() (line 42 of vendor\doctrine\annotations\lib\Doctrine\Common\Annotations\AnnotationException.php).

when i go to look the line 66 in entity class Message , i have this:

'weight' => -5,

i'm developing hospital management product.
Blood Management is there which is having blood status contains blood group and blood quantity.
While giving blood to patient i need to refer blood status table & quantity should be less than or equal.

i want throw error back if quantity is more than available blood .
How can i implement this.?

I receive error messages, when I want to test a custom module, which uses configuration entities. The problem finds place, when during installation of the tested module, the yaml files in config/install/ folder are processed.