#575: did some refactoring according to comments

app/mailers/user_mailer.rb

@@ -38,13 +38,11 @@ class UserMailer < ActionMailer::Base
 
   def build_list_notification(build_list, user)
     I18n.locale = user.language if user.language
-    @user = user
-    @build_list = build_list
+    @user, @build_list = user, build_list
 
     subject = "[#{build_list.bs_id.present? ? build_list.bs_id : t("layout.build_lists.bs_id_not_set")}] "
     subject << (build_list.project ? build_list.project.name_with_owner : t("layout.projects.unexisted_project"))
-    subject << " - "
-    subject << build_list.human_status
+    subject << " - #{build_list.human_status}"
     mail(:to => user.email, :subject => subject) do |format|
       format.html
     end

app/models/build_list_observer.rb

@@ -25,25 +25,20 @@ class BuildListObserver < ActiveRecord::Observer
   private
 
   def self.notify_users(build_list)
-    unless build_list.mass_build_id
+    if !build_list.mass_build_id &&
+       ( (build_list.auto_publish? && PUBLICATION_STATUSES.include?(build_list.status)) ||
+         (!build_list.auto_publish? && STATUSES.include?(build_list.status)) )
+
       users = []
       if build_list.project # find associated users
-        associated_users = build_list.project.members
-        associated_users << (build_list.project.owner.is_a?(User) ?
-          build_list.project.owner : build_list.project.owner.members)
-        users = associated_users.flatten.uniq.
+        users = build_list.project.all_members.
           select{ |user| user.notifier.can_notify? && user.notifier.new_associated_build? }
       end
       if build_list.user.notifier.can_notify? && build_list.user.notifier.new_build?
-        users << build_list.user unless users.include?(build_list.user)
+        users | [build_list.user]
       end
       users.each do |user|
-        if (( build_list.auto_publish? &&
-              PUBLICATION_STATUSES.include?(build_list.status) ) ||
-            ( !build_list.auto_publish? && STATUSES.include?(build_list.status) ))
-
-            UserMailer.build_list_notification(build_list, user).deliver
-        end
+        UserMailer.build_list_notification(build_list, user).deliver
       end
     end
   end # notify_users

app/models/project.rb

@@ -76,8 +76,12 @@ class Project < ActiveRecord::Base
     name
   end
 
+  def all_members
+    (members | (owner_type == 'User' ? [owner] : owner.members)).uniq
+  end
+
   def members
-    collaborators + groups.map(&:members).flatten
+    collaborators | groups.map(&:members).flatten
   end
 
   def platforms