let declarative_authorization support using multi auth rule files.

README.rdoc

@@ -241,7 +241,7 @@ the conditions for manual rewrites.
 
 == Authorization Rules
 
-Authorization rules are defined in config/authorization_rules.rb.  E.g.
+Authorization rules are defined in config/authorization_rules.rb(Or redefine rules files path via +AUTH_RULE_FILES+).  E.g.
 
     authorization do
       role :admin do

lib/declarative_authorization/authorization.rb

@@ -20,7 +20,7 @@ class AuthorizationUsageError < AuthorizationError ; end
   # The exception is raised to ensure that the entire rule is invalidated.
   class NilAttributeValueError < AuthorizationError; end
 
-  AUTH_DSL_FILE = "#{RAILS_ROOT}/config/authorization_rules.rb"
+  AUTH_DSL_FILES = ["#{RAILS_ROOT}/config/authorization_rules.rb"] unless defined? AUTH_DSL_FILES
 
   # Controller-independent method for retrieving the current user.
   # Needed for model security where the current controller is not available.
@@ -67,7 +67,7 @@ class Engine
     def initialize (reader = nil)
       if reader.nil?
         begin
-          reader = Reader::DSLReader.load(AUTH_DSL_FILE)
+          reader = Reader::DSLReader.load(AUTH_DSL_FILES)
         rescue SystemCallError
           reader = Reader::DSLReader.new
         end

lib/declarative_authorization/reader.rb

@@ -66,10 +66,12 @@ def parse (dsl_data, file_name = nil)
       end
 
       # Loads and parses a DSL from the given file name.
-      def self.load (dsl_file)
+      def self.load (dsl_files)
         # TODO cache reader in production mode?
         reader = new
-        reader.parse(File.read(dsl_file), dsl_file)
+        dsl_files.each do |file|
+          reader.parse(File.read(file), file) if File.exist?(file)
+        end
         reader
       end