Optimise CI status accessor

app/models/commit_status.rb

@@ -90,31 +90,6 @@ class CommitStatus < ActiveRecord::Base
     group('stage').order(order_by).pluck(:stage, order_by).map(&:first).compact
   end
 
-  def self.status_sql
-    builds = all.select('count(id)').to_sql
-    success = all.success.select('count(id)').to_sql
-    ignored = all.failed.where(allow_failure: true).select('count(id)').to_sql if all.try(:ignored)
-    ignored ||= '0'
-    pending = all.pending.select('count(id)').to_sql
-    running = all.running.select('count(id)').to_sql
-    canceled = all.canceled.select('count(id)').to_sql
-
-    deduce_status = "(CASE
-      WHEN (#{builds})=0 THEN 'skipped'
-      WHEN (#{builds})=(#{success})+(#{ignored}) THEN 'success'
-      WHEN (#{builds})=(#{pending}) THEN 'pending'
-      WHEN (#{builds})=(#{canceled}) THEN 'canceled'
-      WHEN (#{running})+(#{pending})>0 THEN 'running'
-      ELSE 'failed'
-    END)"
-
-    deduce_status
-  end
-
-  def self.status
-    pluck(self.status_sql).first
-  end
-
   def self.stages_status
     Hash[group(:stage).pluck(:stage, self.status_sql)]
   end

app/models/concerns/ci_status.rb

@@ -2,23 +2,29 @@ module CiStatus
   extend ActiveSupport::Concern
 
   module ClassMethods
-    def status
-      objs = all.to_a
-      if objs.none?
-        nil
-      elsif objs.all? { |status| status.success? || status.try(:ignored?) }
-        'success'
-      elsif objs.all?(&:pending?)
-        'pending'
-      elsif objs.any?(&:running?) || all.any?(&:pending?)
-        'running'
-      elsif objs.all?(&:canceled?)
-        'canceled'
-      elsif objs.all?(&:skipped?)
-        'skipped'
-      else
-        'failed'
+    def status_sql
+      builds = all.select('count(id)').to_sql
+      success = all.success.select('count(id)').to_sql
+      ignored = all.failed.where(allow_failure: true).select('count(id)').to_sql if all.try(:ignored)
+      ignored ||= '0'
+      pending = all.pending.select('count(id)').to_sql
+      running = all.running.select('count(id)').to_sql
+      canceled = all.canceled.select('count(id)').to_sql
+
+      deduce_status = "(CASE
+        WHEN (#{builds})=0 THEN 'skipped'
+        WHEN (#{builds})=(#{success})+(#{ignored}) THEN 'success'
+        WHEN (#{builds})=(#{pending}) THEN 'pending'
+        WHEN (#{builds})=(#{canceled}) THEN 'canceled'
+        WHEN (#{running})+(#{pending})>0 THEN 'running'
+        ELSE 'failed'
+      END)"
+
+      deduce_status
     end
+
+    def status
+      pluck(self.status_sql).first
     end
 
     def duration