extract arrays to constants in Mapper

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -945,6 +945,8 @@ module Resources
         VALID_ON_OPTIONS  = [:new, :collection, :member]
         RESOURCE_OPTIONS  = [:as, :controller, :path, :only, :except, :param, :concerns]
         CANONICAL_ACTIONS = %w(index create new show update destroy)
+        RESOURCE_METHOD_SCOPES = [:collection, :member, :new]
+        RESOURCE_SCOPES = [:resource, :resources]
 
         class Resource #:nodoc:
           attr_reader :controller, :path, :options, :param
@@ -1499,11 +1501,11 @@ def scope_action_options #:nodoc:
           end
 
           def resource_scope? #:nodoc:
-            [:resource, :resources].include? @scope[:scope_level]
+            RESOURCE_SCOPES.include? @scope[:scope_level]
           end
 
           def resource_method_scope? #:nodoc:
-            [:collection, :member, :new].include? @scope[:scope_level]
+            RESOURCE_METHOD_SCOPES.include? @scope[:scope_level]
           end
 
           def with_exclusive_scope