drupal hooks

Problem:

I need to place a block added by another module on my page. I cannot add it by placing the block on a region. Because there is specific placement on the content region itself

Solution:

Add the block programatically to the page. We can get the block content programatically on a hook_preprocess function and add it to the $variables to print on the twig template

Problem:

I need to redirect a form to a specific URL on submit

Solution

1. Add a custom submit on hook_form_alter();

   • Use either of the lines below

PROBLEM: 

I needed to add a NOT IN condition with a nested query for the WHERE condition. The usual method wont work

 

$view->query->where[1]['conditions'][] = array(
            ['field'] => 'groups_group_membership.type'
            ['value'] => array
                (
                    [0] => 'SELECT_QUERY_HERE'
                  
                )

            ['operator'] => IN
        );

SOLUTION :

The way that works

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?