Allow skipping users in autocomplete

Pass an array of user IDs in the `skip_users` param to have them
excluded from the results (unless they are explicitly included through
the `current_user` or `author_id` params).

app/assets/javascripts/users_select.js

@@ -189,6 +189,7 @@
           _this.groupId = $(select).data('group-id');
           _this.showCurrentUser = $(select).data('current-user');
           _this.authorId = $(select).data('author-id');
+          _this.skipUsers = $(select).data('skip-users');
           showNullUser = $(select).data('null-user');
           showAnyUser = $(select).data('any-user');
           showEmailUser = $(select).data('email-user');
@@ -320,7 +321,8 @@
           project_id: this.projectId,
           group_id: this.groupId,
           current_user: this.showCurrentUser,
-          author_id: this.authorId
+          author_id: this.authorId,
+          skip_users: this.skipUsers
         },
         dataType: "json"
       }).done(function(users) {

app/controllers/autocomplete_controller.rb

@@ -5,6 +5,7 @@ class AutocompleteController < ApplicationController
   def users
     @users ||= User.none
     @users = @users.search(params[:search]) if params[:search].present?
+    @users = @users.where.not(id: params[:skip_users]) if params[:skip_users].present?
     @users = @users.active
     @users = @users.reorder(:name)
     @users = @users.page(params[:page])

app/helpers/selects_helper.rb

@@ -5,21 +5,9 @@ module SelectsHelper
     css_class << "skip_ldap " if opts[:skip_ldap]
     css_class << (opts[:class] || '')
     value = opts[:selected] || ''
-
-    first_user = opts[:first_user] && current_user ? current_user.username : false
-
     html = {
       class: css_class,
-      data: {
-        placeholder: opts[:placeholder]   || 'Search for a user',
-        null_user: opts[:null_user]       || false,
-        any_user: opts[:any_user]         || false,
-        email_user: opts[:email_user]     || false,
-        first_user: first_user,
-        current_user: opts[:current_user] || false,
-        "push-code-to-protected-branches" => opts[:push_code_to_protected_branches],
-        author_id: opts[:author_id] || ''
-      }
+      data: users_select_data_attributes(opts)
     }
     unless opts[:scope] == :all
@@ -68,4 +56,20 @@ module SelectsHelper
     hidden_field_tag(id, value, class: css_class)
   end
+
+  private
+
+  def users_select_data_attributes(opts)
+    {
+      placeholder: opts[:placeholder]   || 'Search for a user',
+      null_user: opts[:null_user]       || false,
+      any_user: opts[:any_user]         || false,
+      email_user: opts[:email_user]     || false,
+      first_user: opts[:first_user] && current_user ? current_user.username : false,
+      current_user: opts[:current_user] || false,
+      "push-code-to-protected-branches" => opts[:push_code_to_protected_branches],
+      author_id: opts[:author_id] || '',
+      skip_users: opts[:skip_users] ? opts[:skip_users].map(&:id) : nil,
+    }
+  end
 end

spec/controllers/autocomplete_controller_spec.rb

@@ -163,4 +163,17 @@ describe AutocompleteController do
       expect(body.collect { |u| u['id'] }).not_to include(99999)
     end
   end
+
+  context 'skip_users parameter included' do
+    before { sign_in(user) }
+
+    it 'skips the user IDs passed' do
+      get(:users, skip_users: [user, user2].map(&:id))
+
+      other_user_ids = [non_member, project.owner, project.creator].map(&:id)
+      response_user_ids = JSON.parse(response.body).map { |user| user['id'] }
+
+      expect(response_user_ids).to contain_exactly(*other_user_ids)
+    end
+  end
 end