add offline scope to Ci::Runner

(cherry picked from commit 00647b31)

app/models/ci/runner.rb

@@ -30,6 +30,7 @@ module Ci
     scope :active, -> { where(active: true) }
     scope :paused, -> { where(active: false) }
     scope :online, -> { where('contacted_at > ?', contact_time_deadline) }
+    scope :offline, -> { where.not(id: online) }
     scope :ordered, -> { order(id: :desc) }
 
     # BACKWARD COMPATIBILITY: There are needed to maintain compatibility with `AVAILABLE_SCOPES` used by `lib/api/runners.rb`

spec/models/ci/runner_spec.rb

@@ -223,7 +223,7 @@ describe Ci::Runner do
     subject { described_class.online }
 
     before do
-      @runner1 = create(:ci_runner, :instance, contacted_at: 1.year.ago)
+      @runner1 = create(:ci_runner, :instance, contacted_at: 1.hour.ago)
       @runner2 = create(:ci_runner, :instance, contacted_at: 1.second.ago)
     end
 
@@ -300,6 +300,17 @@ describe Ci::Runner do
     end
   end
 
+  describe '.offline' do
+    subject { described_class.offline }
+
+    before do
+      @runner1 = create(:ci_runner, :instance, contacted_at: 1.hour.ago)
+      @runner2 = create(:ci_runner, :instance, contacted_at: 1.second.ago)
+    end
+
+    it { is_expected.to eq([@runner1])}
+  end
+
   describe '#can_pick?' do
     set(:pipeline) { create(:ci_pipeline) }
     let(:build) { create(:ci_build, pipeline: pipeline) }