Simplify CI projects query

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/controllers/ci/projects_controller.rb

@@ -16,12 +16,15 @@ module Ci
     end
 
     def index
+      @projects = Ci::Project.all
+
       if current_user
-        @projects = ProjectListBuilder.new.execute(current_user, params[:search])
-        @projects = @projects.page(params[:page]).per(40)
-        @total_count = @projects.size
+        @projects = @projects.where(gitlab_id: current_user.authorized_projects.pluck(:id))
       end
 
+      @projects = @projects.includes(:last_commit).order('ci_commits.created_at DESC')
+      @projects = @projects.page(params[:page]).per(40)
+
       respond_to do |format|
         format.json do
           pager_json("ci/projects/index", @total_count)

app/models/ci/project.rb

@@ -41,6 +41,7 @@ module Ci
     has_many :events, dependent: :destroy, class_name: 'Ci::Event'
     has_many :variables, dependent: :destroy, class_name: 'Ci::Variable'
     has_many :triggers, dependent: :destroy, class_name: 'Ci::Trigger'
+    has_one :last_commit, -> { order 'ci_commits.created_at DESC' }, class_name: 'Ci::Commit'
 
     # Project services
     has_many :services, dependent: :destroy, class_name: 'Ci::Service'

app/views/ci/projects/_project.html.haml

-- if project.gitlab_ci_project
-  - ci_project = project.gitlab_ci_project
-  - last_commit = ci_project.last_commit
-  %tr
+- last_commit = project.last_commit
+%tr
   %td
-      = link_to [:ci, ci_project] do
-        = ci_project.name
+    = link_to [:ci, project] do
+      = project.name
   %td
     - if last_commit
       = ci_status_with_icon(last_commit.status)
       = commit_link(last_commit)
       ·
-        - if ci_project.last_commit_date
-          = time_ago_in_words ci_project.last_commit_date
+      - if project.last_commit_date
+        = time_ago_in_words project.last_commit_date
         ago
     - else
       No builds yet
   %td
-      - if ci_project.public
+    - if project.public
       %i.fa.fa-globe
       Public
     - else
       %i.fa.fa-lock
       Private
   %td
-      = ci_project.commits.count
+    = project.commits.count

lib/ci/project_list_builder.rb

-module Ci
-  class ProjectListBuilder
-    def execute(current_user, search = nil)
-      projects = current_user.authorized_projects
-      projects = projects.search(search) if search
-      
-      projects.
-        joins("LEFT JOIN ci_projects ON projects.id = ci_projects.gitlab_id
-          LEFT JOIN #{last_commit_subquery} AS last_commit ON #{Ci::Project.table_name}.id = last_commit.project_id").
-        reorder("ci_projects.id is NULL ASC,
-          CASE WHEN last_commit.committed_at IS NULL THEN 1 ELSE 0 END,
-          last_commit.committed_at DESC")
-    end
-
-    private
-
-    def last_commit_subquery
-      "(SELECT project_id, MAX(committed_at) committed_at FROM #{Ci::Commit.table_name} GROUP BY project_id)"
-    end
-  end
-end