Fix release evidence sometimes not being collected

released_at is being set to Time.now a little earlier
than created_at, which causes release to be "historical"

In this case release evidence is not being collected

So this commit sets released_at to be equal to created_at

app/models/release.rb

@@ -18,12 +18,10 @@ class Release < ApplicationRecord
   has_many :milestones, through: :milestone_releases
   has_many :evidences, inverse_of: :release, class_name: 'Releases::Evidence'
 
-  default_value_for :released_at, allows_nil: false do
-    Time.zone.now
-  end
-
   accepts_nested_attributes_for :links, allow_destroy: true
 
+  before_create :set_released_at
+
   validates :project, :tag, presence: true
   validates_associated :milestone_releases, message: -> (_, obj) { obj[:value].map(&:errors).map(&:full_messages).join(",") }
 
@@ -90,6 +88,10 @@ class Release < ApplicationRecord
       repository.find_tag(tag)
     end
   end
+
+  def set_released_at
+    self.released_at ||= created_at
+  end
 end
 
 Release.prepend_if_ee('EE::Release')

changelogs/unreleased/tags-controller-spec-debug.yml

+---
+title: Fix release evidence sometimes not being collected
+merge_request: 37184
+author:
+type: fixed

spec/controllers/projects/tags_controller_spec.rb

@@ -120,10 +120,14 @@ RSpec.describe Projects::TagsController do
 
         request
 
-        release = project.releases.find_by_tag!('1.0')
+        aggregate_failures do
+          expect(response).to have_gitlab_http_status(:found)
 
-        expect(release).to be_present
-        expect(release.description).to eq(release_description)
+          release = project.releases.find_by_tag('1.0')
+
+          expect(release).to be_present
+          expect(release&.description).to eq(release_description)
+        end
       end
     end
   end

spec/models/release_spec.rb

@@ -73,6 +73,22 @@ RSpec.describe Release do
     end
   end
 
+  describe '.create' do
+    it "fills released_at using created_at if it's not set" do
+      release = described_class.create(project: project, author: user)
+
+      expect(release.released_at).to eq(release.created_at)
+    end
+
+    it "does not change released_at if it's set explicitly" do
+      released_at = Time.zone.parse('2018-10-20T18:00:00Z')
+
+      release = described_class.create(project: project, author: user, released_at: released_at)
+
+      expect(release.released_at).to eq(released_at)
+    end
+  end
+
   describe '#sources' do
     subject { release.sources }