Add migration to fix corrupted projects

db/post_migrate/20170913150359_change_project_id_to_not_null_in_project_features.rb

+class ChangeProjectIdToNotNullInProjectFeatures < ActiveRecord::Migration
+  DOWNTIME = false
+
+  def up
+    # Deletes corrupted project features
+    delete_project_features_sql = "DELETE FROM project_features WHERE project_id IS NULL"
+    execute(delete_project_features_sql)
+
+    change_column_null :project_features, :project_id, false
+  end
+
+  def down
+    change_column_null :project_features, :project_id, true
+  end
+end

db/post_migrate/20170913180600_fix_projects_without_project_feature.rb

+class FixProjectsWithoutProjectFeature < ActiveRecord::Migration
+  DOWNTIME = false
+
+  def up
+    # Creates missing project features with private visibility
+    sql =
+      %Q{
+        INSERT INTO project_features(project_id, repository_access_level, issues_access_level, merge_requests_access_level, wiki_access_level,
+        builds_access_level, snippets_access_level, created_at, updated_at)
+          SELECT projects.id as project_id,
+          10 as repository_access_level,
+          10 as issues_access_level,
+          10 as merge_requests_access_level,
+          10 as wiki_access_level,
+          10 as builds_access_level ,
+          10 as snippets_access_level,
+          projects.created_at,
+          projects.updated_at
+          FROM "projects"
+          LEFT OUTER JOIN project_features ON project_features.project_id = projects.id
+          WHERE (project_features.id IS NULL)
+      }
+
+    execute(sql)
+  end
+
+  def down
+  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: 20170824162758) do
+ActiveRecord::Schema.define(version: 20170913180600) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -1113,7 +1113,7 @@ ActiveRecord::Schema.define(version: 20170824162758) do
   add_index "project_authorizations", ["user_id", "project_id", "access_level"], name: "index_project_authorizations_on_user_id_project_id_access_level", unique: true, using: :btree
 
   create_table "project_features", force: :cascade do |t|
-    t.integer "project_id"
+    t.integer "project_id", null: false
     t.integer "merge_requests_access_level"
     t.integer "issues_access_level"
     t.integer "wiki_access_level"

spec/services/projects/update_service_spec.rb

@@ -58,7 +58,7 @@ describe Projects::UpdateService, '#execute' do
       end
     end
 
-    context 'When project visibility is higher than parent group' do
+    context 'when project visibility is higher than parent group' do
       let(:group) { create(:group, visibility_level: Gitlab::VisibilityLevel::INTERNAL) }
 
       before do