Add index on order columns

CHANGELOG

@@ -10,7 +10,7 @@ v 7.8.0
   - Add diff syntax highlighting in email-on-push service notifications (Hannes Rosenögger)
   - Add API endpoint to fetch all changes on a MergeRequest (Jeroen van Baarsen)
   - View note image attachments in new tab when clicked instead of downloading them
-  - 
+  - Improve sorting logic in UI and API. Explicitly define what sorting method used by default
   - Allow more variations for commit messages closing issues (Julien Bianchi and Hannes Rosenögger)
   - 
   - 

app/finders/notes_finder.rb

@@ -10,19 +10,18 @@ class NotesFinder
     notes =
       case target_type
       when "commit"
-        project.notes.for_commit_id(target_id).not_inline.fresh
+        project.notes.for_commit_id(target_id).not_inline
       when "issue"
-        project.issues.find(target_id).notes.inc_author.fresh
+        project.issues.find(target_id).notes.inc_author
       when "merge_request"
-        project.merge_requests.find(target_id).mr_and_commit_notes.inc_author.fresh
+        project.merge_requests.find(target_id).mr_and_commit_notes.inc_author
       when "snippet", "project_snippet"
-        project.snippets.find(target_id).notes.fresh
+        project.snippets.find(target_id).notes
       else
         raise 'invalid target_type'
       end
 
     # Use overlapping intervals to avoid worrying about race conditions
-    notes.where('updated_at > ?', last_fetched_at - FETCH_OVERLAP).
-      order(created_at: :asc, id: :asc)
+    notes.where('updated_at > ?', last_fetched_at - FETCH_OVERLAP).fresh
   end
 end

app/models/note.rb

@@ -49,7 +49,7 @@ class Note < ActiveRecord::Base
   scope :not_inline, ->{ where(line_code: [nil, '']) }
   scope :system, ->{ where(system: true) }
   scope :common, ->{ where(noteable_type: ["", nil]) }
-  scope :fresh, ->{ order("created_at ASC, id ASC") }
+  scope :fresh, ->{ order(created_at: :asc, id: :asc) }
   scope :inc_author_project, ->{ includes(:project, :author) }
   scope :inc_author, ->{ includes(:author) }
 

db/migrate/20150206181414_add_index_to_created_at.rb

+class AddIndexToCreatedAt < ActiveRecord::Migration
+  def change
+    add_index "users", [:created_at, :id]
+    add_index "members", [:created_at, :id]
+    add_index "projects", [:created_at, :id]
+    add_index "issues", [:created_at, :id]
+    add_index "merge_requests", [:created_at, :id]
+    add_index "milestones", [:created_at, :id]
+    add_index "namespaces", [:created_at, :id]
+    add_index "notes", [:created_at, :id]
+    add_index "identities", [:created_at, :id]
+    add_index "keys", [:created_at, :id]
+    add_index "web_hooks", [:created_at, :id]
+    add_index "snippets", [:created_at, :id]
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150205211843) do
+ActiveRecord::Schema.define(version: 20150206181414) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -94,6 +94,7 @@ ActiveRecord::Schema.define(version: 20150205211843) do
     t.datetime "updated_at"
   end
 
+  add_index "identities", ["created_at", "id"], name: "index_identities_on_created_at_and_id", using: :btree
   add_index "identities", ["user_id"], name: "index_identities_on_user_id", using: :btree
 
   create_table "issues", force: true do |t|
@@ -113,6 +114,7 @@ ActiveRecord::Schema.define(version: 20150205211843) do
 
   add_index "issues", ["assignee_id"], name: "index_issues_on_assignee_id", using: :btree
   add_index "issues", ["author_id"], name: "index_issues_on_author_id", using: :btree
+  add_index "issues", ["created_at", "id"], name: "index_issues_on_created_at_and_id", using: :btree
   add_index "issues", ["created_at"], name: "index_issues_on_created_at", using: :btree
   add_index "issues", ["milestone_id"], name: "index_issues_on_milestone_id", using: :btree
   add_index "issues", ["project_id", "iid"], name: "index_issues_on_project_id_and_iid", unique: true, using: :btree
@@ -129,6 +131,7 @@ ActiveRecord::Schema.define(version: 20150205211843) do
     t.string   "fingerprint"
   end
 
+  add_index "keys", ["created_at", "id"], name: "index_keys_on_created_at_and_id", using: :btree
   add_index "keys", ["user_id"], name: "index_keys_on_user_id", using: :btree
 
   create_table "label_links", force: true do |t|
@@ -164,6 +167,7 @@ ActiveRecord::Schema.define(version: 20150205211843) do
   end
 
   add_index "members", ["access_level"], name: "index_members_on_access_level", using: :btree
+  add_index "members", ["created_at", "id"], name: "index_members_on_created_at_and_id", using: :btree
   add_index "members", ["source_id", "source_type"], name: "index_members_on_source_id_and_source_type", using: :btree
   add_index "members", ["type"], name: "index_members_on_type", using: :btree
   add_index "members", ["user_id"], name: "index_members_on_user_id", using: :btree
@@ -200,6 +204,7 @@ ActiveRecord::Schema.define(version: 20150205211843) do
 
   add_index "merge_requests", ["assignee_id"], name: "index_merge_requests_on_assignee_id", using: :btree
   add_index "merge_requests", ["author_id"], name: "index_merge_requests_on_author_id", using: :btree
+  add_index "merge_requests", ["created_at", "id"], name: "index_merge_requests_on_created_at_and_id", using: :btree
   add_index "merge_requests", ["created_at"], name: "index_merge_requests_on_created_at", using: :btree
   add_index "merge_requests", ["milestone_id"], name: "index_merge_requests_on_milestone_id", using: :btree
   add_index "merge_requests", ["source_branch"], name: "index_merge_requests_on_source_branch", using: :btree
@@ -219,6 +224,7 @@ ActiveRecord::Schema.define(version: 20150205211843) do
     t.integer  "iid"
   end
 
+  add_index "milestones", ["created_at", "id"], name: "index_milestones_on_created_at_and_id", using: :btree
   add_index "milestones", ["due_date"], name: "index_milestones_on_due_date", using: :btree
   add_index "milestones", ["project_id", "iid"], name: "index_milestones_on_project_id_and_iid", unique: true, using: :btree
   add_index "milestones", ["project_id"], name: "index_milestones_on_project_id", using: :btree
@@ -234,6 +240,7 @@ ActiveRecord::Schema.define(version: 20150205211843) do
     t.string   "avatar"
   end
 
+  add_index "namespaces", ["created_at", "id"], name: "index_namespaces_on_created_at_and_id", using: :btree
   add_index "namespaces", ["name"], name: "index_namespaces_on_name", using: :btree
   add_index "namespaces", ["owner_id"], name: "index_namespaces_on_owner_id", using: :btree
   add_index "namespaces", ["path"], name: "index_namespaces_on_path", using: :btree
@@ -256,6 +263,7 @@ ActiveRecord::Schema.define(version: 20150205211843) do
 
   add_index "notes", ["author_id"], name: "index_notes_on_author_id", using: :btree
   add_index "notes", ["commit_id"], name: "index_notes_on_commit_id", using: :btree
+  add_index "notes", ["created_at", "id"], name: "index_notes_on_created_at_and_id", using: :btree
   add_index "notes", ["created_at"], name: "index_notes_on_created_at", using: :btree
   add_index "notes", ["noteable_id", "noteable_type"], name: "index_notes_on_noteable_id_and_noteable_type", using: :btree
   add_index "notes", ["noteable_type"], name: "index_notes_on_noteable_type", using: :btree
@@ -333,6 +341,7 @@ ActiveRecord::Schema.define(version: 20150205211843) do
     t.string   "avatar"
   end
 
+  add_index "projects", ["created_at", "id"], name: "index_projects_on_created_at_and_id", using: :btree
   add_index "projects", ["creator_id"], name: "index_projects_on_creator_id", using: :btree
   add_index "projects", ["last_activity_at"], name: "index_projects_on_last_activity_at", using: :btree
   add_index "projects", ["namespace_id"], name: "index_projects_on_namespace_id", using: :btree
@@ -374,6 +383,7 @@ ActiveRecord::Schema.define(version: 20150205211843) do
   end
 
   add_index "snippets", ["author_id"], name: "index_snippets_on_author_id", using: :btree
+  add_index "snippets", ["created_at", "id"], name: "index_snippets_on_created_at_and_id", using: :btree
   add_index "snippets", ["created_at"], name: "index_snippets_on_created_at", using: :btree
   add_index "snippets", ["expires_at"], name: "index_snippets_on_expires_at", using: :btree
   add_index "snippets", ["project_id"], name: "index_snippets_on_project_id", using: :btree
@@ -443,6 +453,7 @@ ActiveRecord::Schema.define(version: 20150205211843) do
   add_index "users", ["admin"], name: "index_users_on_admin", using: :btree
   add_index "users", ["authentication_token"], name: "index_users_on_authentication_token", unique: true, using: :btree
   add_index "users", ["confirmation_token"], name: "index_users_on_confirmation_token", unique: true, using: :btree
+  add_index "users", ["created_at", "id"], name: "index_users_on_created_at_and_id", using: :btree
   add_index "users", ["current_sign_in_at"], name: "index_users_on_current_sign_in_at", using: :btree
   add_index "users", ["email"], name: "index_users_on_email", unique: true, using: :btree
   add_index "users", ["name"], name: "index_users_on_name", using: :btree
@@ -473,6 +484,7 @@ ActiveRecord::Schema.define(version: 20150205211843) do
     t.boolean  "tag_push_events",       default: false
   end
 
+  add_index "web_hooks", ["created_at", "id"], name: "index_web_hooks_on_created_at_and_id", using: :btree
   add_index "web_hooks", ["project_id"], name: "index_web_hooks_on_project_id", using: :btree
 
 end