adds spending proposal show for valuator and admin

app/models/abilities/valuator.rb

@@ -0,0 +1,9 @@
+module Abilities
+  class Valuator
+    include CanCan::Ability
+
+    def initialize(user)
+      can :manage, SpendingProposal
+    end
+  end
+end

app/models/ability.rb

@@ -7,6 +7,8 @@ class Ability
     alias_action :hide_in_moderation_screen, to: :hide
 
     if user # logged-in users
+      self.merge Abilities::Valuator.new(user) if user.valuator?
+
       if user.administrator?
         self.merge Abilities::Administrator.new(user)
       elsif user.moderator?