Base.exists?(id, options) and Base#exists? check whether the resource is found. Closes #6970.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5898 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 12 insertions, 0 deletions

diff --git a/activeresource/lib/active_resource/base.rb b/activeresource/lib/active_resource/base.rb
index 7f99e5cbf5..8babc18507 100644
--- a/activeresource/lib/active_resource/base.rb
+++ b/activeresource/lib/active_resource/base.rb
@@ -80,6 +80,13 @@ module ActiveResource
         connection.delete(element_path(id))
       end
 
+      # True if the resource is found.
+      def exists?(id, options = {})
+        id && !find_single(id, options).nil?
+      rescue ActiveResource::ResourceNotFound
+        false
+      end
+
       private
         def find_every(options)
           collection = connection.get(collection_path(options)) || []
@@ -167,6 +174,11 @@ module ActiveResource
       connection.delete(element_path)
     end
 
+    # True if this resource is found.
+    def exists?
+      !new? && self.class.exists?(id, prefix_options)
+    end
+
     def to_xml(options={})
       attributes.to_xml({:root => self.class.element_name}.merge(options))
     end