Added relationships between Release and Milestone

Modified schema via migrations.
Added one-to-one relationship between the two models.
Added changelog file

1 files changed, 7 insertions, 0 deletions

diff --git a/app/models/release.rb b/app/models/release.rb
index 459a7c29ad0..b2e65974aa0 100644
--- a/app/models/release.rb
+++ b/app/models/release.rb
@@ -12,6 +12,12 @@ class Release < ApplicationRecord
 
   has_many :links, class_name: 'Releases::Link'
 
+  # A one-to-one relationship is set up here as part of a MVC: https://gitlab.com/gitlab-org/gitlab-ce/issues/62402
+  # However, on the long term, we will want a many-to-many relationship between Release and Milestone.
+  # The "has_one through" allows us today to set up this one-to-one relationship while setting up the architecture for the long-term (ie intermediate table).
+  has_one :milestone_release
+  has_one :milestone, through: :milestone_release
+
   default_value_for :released_at, allows_nil: false do
     Time.zone.now
   end
@@ -20,6 +26,7 @@ class Release < ApplicationRecord
 
   validates :description, :project, :tag, presence: true
   validates :name, presence: true, on: :create
+  validates_associated :milestone_release, message: -> (_, obj) { obj[:value].errors.full_messages.join(",") }
 
   scope :sorted, -> { order(released_at: :desc) }