Add an `Issue::Metrics` model.

- And store the `first_associated_with_milestone_at` and
  `first_added_to_board_at` times, when an issue is saved.

1 files changed, 21 insertions, 0 deletions

diff --git a/app/models/issue/metrics.rb b/app/models/issue/metrics.rb
new file mode 100644
index 00000000000..4436696cc1a
--- /dev/null
+++ b/app/models/issue/metrics.rb
@@ -0,0 +1,21 @@
+class Issue::Metrics < ActiveRecord::Base
+  belongs_to :issue
+
+  def record!
+    if issue.milestone_id.present? && self.first_associated_with_milestone_at.blank?
+      self.first_associated_with_milestone_at = Time.now
+    end
+
+    if issue_assigned_to_list_label? && self.first_added_to_board_at.blank?
+      self.first_added_to_board_at = Time.now
+    end
+
+    self.save if self.changed?
+  end
+
+  private
+
+  def issue_assigned_to_list_label?
+    issue.labels.any? { |label| label.lists.present? }
+  end
+end