Give last_activity_at a default value so it will always be set

CHANGELOG

@@ -3,6 +3,7 @@ v 7.9.0 (unreleased)
   - Upgrade Rails gem to version 4.1.9.
   - Improve UI for commits, issues and merge request lists
   - Fix commit comments on first line of diff not rendering in Merge Request Discussion view.
+  - Fix ordering of imported but unchanged projects (Marco Wessel)
 
 v 7.8.0
   - Fix access control and protection against XSS for note attachments and other uploads.

app/models/project.rb

@@ -48,6 +48,12 @@ class Project < ActiveRecord::Base
   default_value_for :wall_enabled, false
   default_value_for :snippets_enabled, gitlab_config_features.snippets
 
+  # set last_activity_at to the same as updated_at
+  before_create :set_last_activity_at
+  def set_last_activity_at
+    self.last_activity_at = self.updated_at
+  end
+
   ActsAsTaggableOn.strict_case_match = true
   acts_as_taggable_on :tags
 

db/migrate/20150223022001_set_missing_last_activity_at.rb

@@ -0,0 +1,9 @@
+class SetMissingLastActivityAt < ActiveRecord::Migration
+  def up
+    execute "UPDATE projects SET last_activity_at = updated_at WHERE last_activity_at IS NULL"
+  end
+
+  def down
+    raise ActiveRecord::IrreversibleMigration
+  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: 20150213121042) do
+ActiveRecord::Schema.define(version: 20150223022001) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -334,12 +334,12 @@ ActiveRecord::Schema.define(version: 20150213121042) do
     t.string   "import_url"
     t.integer  "visibility_level",       default: 0,        null: false
     t.boolean  "archived",               default: false,    null: false
-    t.string   "avatar"
     t.string   "import_status"
     t.float    "repository_size",        default: 0.0
     t.integer  "star_count",             default: 0,        null: false
     t.string   "import_type"
     t.string   "import_source"
+    t.string   "avatar"
   end
 
   add_index "projects", ["created_at", "id"], name: "index_projects_on_created_at_and_id", using: :btree