Module development and code questions

Hi guys, 

I'm trying to learn how to develop modules and I'm having controller path problems

InvalidArgumentException: Class "\Drupal\new_module\Controller\NewModuleController" does not exist. in Drupal\Core\DependencyInjection\ClassResolver->getInstanceFromDefinition() (line 24 of core\lib\Drupal\Core\DependencyInjection\ClassResolver.php).

web\modules\custom\new_module\new_module.info.yml:

Hello, in a view I have a column with entity reference field that displays me the Description.
In the exposed filter I put the same field (it shows me as textfield and machina name field_required_target_id). In order to filter the data, I have to write the id of the entity reference.
The choice has to be made by description and in, views_exposed_form I transform the field field_requiring_target_id, from type->textfield to type->entity_autocomplete
When I perform the search, the field turns out to be linked with the description and filters my movements well.

We are in the process of upgrading to Drupal 10 but wants to know if it has a module/plug in for handling Floor plans.

Benneth

Hi,

Please let me know if it's possible to make article locked by permission, and make it avaliable to read only by scan QR Code (via phone).

Thanks for any suggestions.

Please, note that I'm completly new to Druapal (after few years with Joomla, I decided to learn something new).

Thank you!

Hi my site is running fine on multi server databases(2). Now there is a requirement in which 1 need to run a join query(3 joins) in that I need to get 1st and 3rd joins record from server1 db and 2nd join record from server2. I am not understanding how I can run such a query. Need you help.

I am using drupal 8.4