Touch Budget object after updating a Budget::Pphase

Why:

We need to clear associated rails cache keys in order for changes to be
ready to be seen on the views

How:

* Just an after_save callback to a private method

app/models/budget/phase.rb

@@ -21,6 +21,7 @@ class Budget
     before_validation :sanitize_description
 
     after_save :adjust_date_ranges
+    after_save :touch_budget
 
     scope :enabled,           -> { where(enabled: true) }
     scope :published,         -> { enabled.where.not(kind: 'drafting') }
@@ -59,6 +60,10 @@ class Budget
 
     private
 
+    def touch_budget
+      budget.touch
+    end
+
     def prev_phase_dates_valid?
       if enabled? && starts_at.present? && prev_enabled_phase.present?
         prev_enabled_phase.assign_attributes(ends_at: starts_at)