Simplified the sql queries used in issuable scopes

app/models/concerns/issuable.rb

@@ -100,8 +100,8 @@ module Issuable
     scope :of_milestones, ->(ids) { where(milestone_id: ids) }
     scope :any_milestone, -> { where('milestone_id IS NOT NULL') }
     scope :with_milestone, ->(title) { left_joins_milestones.where(milestones: { title: title }) }
-    scope :any_release, -> { left_joins_milestones_joins_releases }
-    scope :with_release, -> (tag) { left_joins_milestones_joins_releases.where( milestones: { releases: { tag: tag } } ) }
+    scope :any_release, -> { joins_milestone_releases }
+    scope :with_release, -> (tag) { joins_milestone_releases.where( milestones: { releases: { tag: tag } } ) }
     scope :opened, -> { with_state(:opened) }
     scope :only_opened, -> { with_state(:opened) }
     scope :closed, -> { with_state(:closed) }
@@ -124,16 +124,13 @@ module Issuable
     scope :order_milestone_due_asc,  -> { left_joins_milestones.reorder(Arel.sql('milestones.due_date IS NULL, milestones.id IS NULL, milestones.due_date ASC')) }
 
     scope :without_release, -> do
-      left_joins_milestones
-        .joins("LEFT OUTER JOIN milestone_releases ON milestones.id = milestone_releases.milestone_id")
+      joins("LEFT OUTER JOIN milestone_releases ON #{table_name}.milestone_id = milestone_releases.milestone_id")
         .where('milestone_releases.release_id IS NULL')
     end
 
-    scope :left_joins_milestones_joins_releases, -> do
-      left_joins_milestones
-        .joins("JOIN milestone_releases ON milestones.id = milestone_releases.milestone_id
-                JOIN releases ON milestone_releases.release_id = releases.id")
-        .where('milestone_releases.release_id IS NOT NULL').distinct
+    scope :joins_milestone_releases, -> do
+      joins("JOIN milestone_releases ON issues.milestone_id = milestone_releases.milestone_id
+             JOIN releases ON milestone_releases.release_id = releases.id").distinct
     end
 
     scope :without_label, -> { joins("LEFT OUTER JOIN label_links ON label_links.target_type = '#{name}' AND label_links.target_id = #{table_name}.id").where(label_links: { id: nil }) }