Add helper function for speaker selection

The line '@users = User.all.order(:name)' is replicated a lot of times
in EventsController and ProposalsController.
So, this commit removes it and adds a helper function
'speaker_selector_input' that generates the field where the @users
variable was used.
Also, it makes the query more specific.

Fix #1455

Other changes:
* Include the username in the drop down menu
* Add .active scope to User and corresponding tests
* Add :disabled trait to User factory

app/controllers/admin/events_controller.rb

@@ -62,7 +62,6 @@ module Admin
       @comments = @event.root_comments
       @comment_count = @event.comment_threads.count
       @user = @event.submitter
-      @users = User.all.order(:name)
       @url = admin_conference_program_event_path(@conference.short_title, @event)
       @languages = @program.languages_list
     end
@@ -80,7 +79,6 @@ module Admin
     end
 
     def update
-      @users = User.all.order(:name)
       @languages = @program.languages_list
       if @event.update_attributes(event_params)
 
@@ -99,7 +97,6 @@ module Admin
 
     def create
       @url = admin_conference_program_events_path(@conference.short_title, @event)
-      @users = User.all.order(:name)
       @languages = @program.languages_list
       @event.submitter = current_user
 
@@ -115,7 +112,6 @@ module Admin
     def new
       @url = admin_conference_program_events_path(@conference.short_title, @event)
       @languages = @program.languages_list
-      @users = User.all.order(:name)
     end
 
     def accept

app/controllers/proposals_controller.rb

@@ -25,7 +25,6 @@ class ProposalsController < ApplicationController
 
   def edit
     @url = conference_program_proposal_path(@conference.short_title, params[:id])
-    @users = User.all.order(:name)
     @languages = @program.languages_list
   end
 
@@ -61,7 +60,6 @@ class ProposalsController < ApplicationController
 
   def update
     @url = conference_program_proposal_path(@conference.short_title, params[:id])
-    @users = User.all.order(:name)
 
     if @event.update(event_params)
       redirect_to conference_program_proposals_path(conference_id: @conference.short_title),

app/helpers/application_helper.rb

@@ -602,4 +602,11 @@ module ApplicationHelper
   def speaker_links(event)
     event.speakers.map{ |speaker| link_to speaker.name, admin_user_path(speaker) }.join(', ').html_safe
   end
+
+  def speaker_selector_input(form)
+    users = User.active.pluck(:id, :name, :username, :email).map { |user| [user[0], user[1].blank? ? user[2] : user[1], user[2], user[3]] }.sort_by { |user| user[1].downcase }
+    form.input :speakers, as: :select,
+                          collection: options_for_select(users.map {|user| ["#{user[1]} (#{user[2]}) #{user[3]}", user[0]]}, @event.speakers.map(&:id)),
+                          include_blank: false, label: 'Speakers', input_html: { class: 'select-help-toggle', multiple: 'true' }
+  end
 end

app/models/user.rb

@@ -53,6 +53,7 @@ class User < ActiveRecord::Base
   accepts_nested_attributes_for :roles
 
   scope :admin, -> { where(is_admin: true) }
+  scope :active, -> { where(is_disabled: false) }
 
   validates :email, presence: true
 

app/views/proposals/_proposal_form.html.haml

@@ -4,9 +4,7 @@
 
     = f.input :subtitle, as: :string
 
-    = f.input :speakers, as: :select,
-      collection: options_for_select(@users.map {|user| ["#{user.name} (#{user.email})", user.id]}, @event.speakers.map(&:id)),
-      include_blank: false, label: 'Speakers', input_html: { class: 'select-help-toggle', multiple: 'true' }
+    = speaker_selector_input f
 
     - if @program.tracks.any?
       = f.input :track_id, as: :select,

spec/factories/users.rb

@@ -29,6 +29,7 @@ FactoryGirl.define do
       Quisque cursus facilisis consequat. Etiam volutpat ligula turpis, at
       gravida.
     EOS
+    is_disabled false
 
     after(:create) do |user|
       user.is_admin = false
@@ -44,6 +45,10 @@ FactoryGirl.define do
         user.save!
       end
     end
+
+    trait :disabled do
+      is_disabled true
+    end
   end
 
   factory :user_xss, parent: :user do

spec/models/user_spec.rb

@@ -10,6 +10,7 @@ describe User do
   let(:volunteers_coordinator_role) { Role.find_by(name: 'volunteers_coordinator', resource: conference) }
   let(:organizer) { create(:user, role_ids: [organizer_role.id]) }
   let(:user) { create(:user) }
+  let(:user_disabled) { create(:user, :disabled) }
 
   let(:event1) { create(:event, program: conference.program) }
   let(:another_conference) { create(:conference) }
@@ -75,6 +76,16 @@ describe User do
       end
     end
 
+    describe '.active' do
+      it 'includes users without is_disabled flag' do
+        expect(User.active).to include(user)
+      end
+
+      it 'excludes users with is_disabled flag' do
+        expect(User.active).not_to include(user_disabled)
+      end
+    end
+
     describe '.comment_notifiable' do
       let(:cfp_user) { create(:user, role_ids: [cfp_role.id]) }