module development

Problem

I want to change the title and controller of the '/user/reset/{uid}/{timestamp}/{hash}'

Problem

I want to add a link to my content page that will dynamically change/replace content on the page using AJAX.

Solution

The solution here is add a route and to write a call back that will respond accordingly. The only difference here is 

• The link is not a a normal link but a link that will load using a AJAX call
• The Response here is also not normal it will be a  AjaxResponse

So lets see how we can do this

The core_version_requirement key specifies what versions of Drupal that the module is compatible with.

 

name: Example
type: module
core: 8.x
core_version_requirement: ^8 || ^9

 

The above example  says that the module is compatible with Drupal 9 and Drupal 9. Notice that the core key is still compulsory here

The chnage

After Drupal 8.8.0 we will not need the core key anymore.

Problem:

I want to use the address field in a custom form which can be fulfilled with the below code

$form['address'] = [
  '#type' => 'address',
  '#required' => TRUE,
];

This would print the following fields

Now what if we want to hide some the above fields

Problem:

Drupal sometimes shows errors as follows 

Message	EntityMetadataWrapperException: Unknown data property field_activity_status.

Problem: There is no specific function in Drupal 8 which we can use to get all blocks assigned to a region. We used to have a function called block_get_blocks_by_region in Drupal 7 to do this

Solution : Although we don't have a specific function we have the tools in Drupal 8 s Object oriented hierarchy to do the same. Here is the code

 

function my_module_get_blocks_by_region($region) {

  $blocks = \Drupal::entityTypeManager()

    ->getStorage('block')->loadByProperties([

Problem : How does hook_update_n work in Drupal.

Why we use it: We want to perform a change on a website that is already live. We cannot uninstall and re-enable the module. So we add a hook_update_n

Solution

Well Idealy its all about the naming of the hook SO it goes like this

mymodulename_update_7002
what is 7002?