Added relationships between Release and Milestone

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

2 files changed, 29 insertions, 0 deletions

diff --git a/db/migrate/20190722144316_create_milestone_releases_table.rb b/db/migrate/20190722144316_create_milestone_releases_table.rb
new file mode 100644
index 00000000000..55878bcec41
--- /dev/null
+++ b/db/migrate/20190722144316_create_milestone_releases_table.rb
@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+
+class CreateMilestoneReleasesTable < ActiveRecord::Migration[5.2]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    create_table :milestone_releases do |t|
+      t.references :milestone, foreign_key: { on_delete: :cascade }, null: false, index: false
+      t.references :release, foreign_key: { on_delete: :cascade }, null: false
+    end
+
+    add_index :milestone_releases, [:milestone_id, :release_id], unique: true, name: 'index_miletone_releases_on_milestone_and_release'
+  end
+
+  def down
+    drop_table :milestone_releases
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 3980627045e..b24558f459e 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -2158,6 +2158,13 @@ ActiveRecord::Schema.define(version: 2019_09_02_131045) do
     t.index ["user_id"], name: "index_merge_trains_on_user_id"
   end
 
+  create_table "milestone_releases", force: :cascade do |t|
+    t.bigint "milestone_id", null: false
+    t.bigint "release_id", null: false
+    t.index ["milestone_id", "release_id"], name: "index_miletone_releases_on_milestone_and_release", unique: true
+    t.index ["release_id"], name: "index_milestone_releases_on_release_id"
+  end
+
   create_table "milestones", id: :serial, force: :cascade do |t|
     t.string "title", null: false
     t.integer "project_id"
@@ -3932,6 +3939,8 @@ ActiveRecord::Schema.define(version: 2019_09_02_131045) do
   add_foreign_key "merge_trains", "merge_requests", on_delete: :cascade
   add_foreign_key "merge_trains", "projects", column: "target_project_id", on_delete: :cascade
   add_foreign_key "merge_trains", "users", on_delete: :cascade
+  add_foreign_key "milestone_releases", "milestones", on_delete: :cascade
+  add_foreign_key "milestone_releases", "releases", on_delete: :cascade
   add_foreign_key "milestones", "namespaces", column: "group_id", name: "fk_95650a40d4", on_delete: :cascade
   add_foreign_key "milestones", "projects", name: "fk_9bd0a0c791", on_delete: :cascade
   add_foreign_key "namespace_aggregation_schedules", "namespaces", on_delete: :cascade