Converted users_select to use axios

app/assets/javascripts/users_select.js

@@ -2,6 +2,7 @@
 /* global Issuable */
 /* global emitSidebarEvent */
 import _ from 'underscore';
+import axios from './lib/utils/axios_utils';
 
 // TODO: remove eventHub hack after code splitting refactor
 window.emitSidebarEvent = window.emitSidebarEvent || $.noop;
@@ -177,12 +178,8 @@ function UsersSelect(currentUser, els, options = {}) {
         $loading.removeClass('hidden').fadeIn();
         $dropdown.trigger('loading.gl.dropdown');
 
-        return $.ajax({
-          type: 'PUT',
-          dataType: 'json',
-          url: issueURL,
-          data: data
-        }).done(function(data) {
+        return axios.put(issueURL, data)
+          .then(({ data }) => {
             var user;
             $dropdown.trigger('loaded.gl.dropdown');
             $loading.fadeOut();
@@ -660,22 +657,17 @@ UsersSelect.prototype.user = function(user_id, callback) {
   var url;
   url = this.buildUrl(this.userPath);
   url = url.replace(':id', user_id);
-  return $.ajax({
-    url: url,
-    dataType: "json"
-  }).done(function(user) {
-    return callback(user);
+  return axios.get(url)
+    .then(({ data }) => {
+      callback(data);
     });
 };
 
 // Return users list. Filtered by query
 // Only active users retrieved
 UsersSelect.prototype.users = function(query, options, callback) {
-  var url;
-  url = this.buildUrl(this.usersPath);
-  return $.ajax({
-    url: url,
-    data: {
+  const url = this.buildUrl(this.usersPath);
+  const params = {
     search: query,
     per_page: options.perPage || 20,
     active: true,
@@ -687,10 +679,10 @@ UsersSelect.prototype.users = function(query, options, callback) {
     current_user: options.showCurrentUser || null,
     author_id: options.authorId || null,
     skip_users: options.skipUsers || null
-    },
-    dataType: "json"
-  }).done(function(users) {
-    return callback(users);
+  };
+  return axios.get(url, { params })
+    .then(({ data }) => {
+      callback(data);
     });
 };