check if Rails exists for the rails support

lib/couchrest/support/rails.rb

@@ -1,52 +1,52 @@
 # This file contains various hacks for Rails compatibility.
-# To use, just require in environment.rb, like so:
-#
-#   require 'couchrest/support/rails'
 
-class Hash
-  # Hack so that CouchRest::Document, which descends from Hash,
-  # doesn't appear to Rails routing as a Hash of options
-  def self.===(other)
-    return false if self == Hash && other.is_a?(CouchRest::Document)
-    super
-  end
-end
-
-
-CouchRest::Document.class_eval do
-  # Need this when passing doc to a resourceful route
-  alias_method :to_param, :id
-  
-  # Hack so that CouchRest::Document, which descends from Hash,
-  # doesn't appear to Rails routing as a Hash of options
-  def is_a?(o)
-    return false if o == Hash
-    super
-  end
-  alias_method :kind_of?, :is_a?
-  
-  # Gives extended doc a seamless logger
-  def logger
-    ActiveRecord::Base.logger
-  end
-end
-
-CouchRest::CastedModel.class_eval do
-  # The to_param method is needed for rails to generate resourceful routes.
-  # In your controller, remember that it's actually the id of the document.
-  def id
-    return nil if base_doc.nil?
-    base_doc.id
-  end
-  alias_method :to_param, :id
-end
-
-require Pathname.new(File.dirname(__FILE__)).join('..', 'validation', 'validation_errors')
-
-CouchRest::Validation::ValidationErrors.class_eval do
-  # Returns the total number of errors added. Two errors added to the same attribute will be counted as such.
-  # This method is called by error_messages_for
-  def count
-    errors.values.inject(0) { |error_count, errors_for_attribute| error_count + errors_for_attribute.size }
+if defined?(Rails)
+
+  class Hash
+    # Hack so that CouchRest::Document, which descends from Hash,
+    # doesn't appear to Rails routing as a Hash of options
+    def self.===(other)
+      return false if self == Hash && other.is_a?(CouchRest::Document)
+      super
+    end
   end
+
+  CouchRest::Document.class_eval do
+    # Need this when passing doc to a resourceful route
+    alias_method :to_param, :id
+  
+    # Hack so that CouchRest::Document, which descends from Hash,
+    # doesn't appear to Rails routing as a Hash of options
+    def is_a?(o)
+      return false if o == Hash
+      super
+    end
+    alias_method :kind_of?, :is_a?
+  
+    # Gives extended doc a seamless logger
+    def logger
+      ActiveRecord::Base.logger
+    end
+  end
+
+  CouchRest::CastedModel.class_eval do
+    # The to_param method is needed for rails to generate resourceful routes.
+    # In your controller, remember that it's actually the id of the document.
+    def id
+      return nil if base_doc.nil?
+      base_doc.id
+    end
+    alias_method :to_param, :id
+  end
+
+  require Pathname.new(File.dirname(__FILE__)).join('..', 'validation', 'validation_errors')
+
+  CouchRest::Validation::ValidationErrors.class_eval do
+    # Returns the total number of errors added. Two errors added to the same attribute will be counted as such.
+    # This method is called by error_messages_for
+    def count
+      errors.values.inject(0) { |error_count, errors_for_attribute| error_count + errors_for_attribute.size }
+    end
+  end
+
 end