Module development and code questions

how should I do if I need to show to a link menu based on a condition ?

This is my YML for my menu link : 

    double_vue_klesia.backuserswitch:
      title: 'Retour user précédent'
      menu_name: navigation-principale
      description: 'Switch back to your user account.'
      route_name: double_vue_klesia.backuser.switch
      weight: 1

I want to show this link only : 

Please help me find why I am not able to upload extra zip files in the listing for customers to download? In the Add a new release section, I find https://www.drupal.org/node/1068944 shows in the picture there is a 'Release Files' but I don't have this field in my form.

Please advise on what to do. 

We have Drupal 7 integration uploaded before and now would like to upload Drupal 8 and keep both in the listing. Please help me find the best approach to do this. Thansk!

Hello, I know it's possible to add a link to my main menu programmaticaly. My question is : how ?

I tried this : 

function double_vue_klesia_menu() {
  $items['user_switch_back'] = array(
    'title'           => 'Page name',
    'description'     => t('Account'),
    'menu_name'       => 'navigation-principale',
    'weight'          => 8,
    'type' => MENU_NORMAL_ITEM,
  );

  return $items;
}

Where double_vue_klesia is my module and navigation-principale is my main menu (this is system name).

How do I autoload third party libraries within my custom module?
I don't want to alter the core composer.json (therefore no composer-merge-plugin.

Currently I'm adding the autoload directly in my my_module.module file

<?php

require_once __DIR__.DIRECTORY_SEPARATOR.'vendor'.DIRECTORY_SEPARATOR.'autoload.php';

Is there a setting or a dedicated hook to provide composer autoload functionality in my module?

I want change a user' user_picture via REST, first I need to upload a file

I post it as follows:

$baseURL = 'http://localhost/d86/'; $uploadUserPicURL = $baseURL.'file/upload/user/user/user_image?_format=json'; echo "uploadUserPicURL = $uploadUserPicURL \n"; $res = $client->request('POST', $uploadUserPicURL, [ 'headers' => [ 'Content-Type' => 'application/octet-stream', 'Content-Disposition' => 'file; filename="cxx.jpg"', 'X-CSRF-Token' => $token ], 'auth' => ['admin', 'admin'], 'body' => $body ]);

Hi,

I want to add a Group By and Order By in views.
https://www.patientsengage.com/admin/reports/articles-reporting-conditio...

How to edit a view and add a Group By and Order By in views.

I want to display: Title and below respective articles to be shown

example:

Title: Autism

list of all the articles of Autism with ASC Order 

I am using Drupal7