Base#==, eql?, and hash methods. == returns true if its argument is identical to self or if it's an instance of the same class, is not new?, and has the same id. eql? is an alias for ==. hash delegates to id.

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@5773 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

1 files changed, 16 insertions, 0 deletions

diff --git a/activeresource/lib/active_resource/base.rb b/activeresource/lib/active_resource/base.rb
index 9a810e4adf..a8918b1eee 100644
--- a/activeresource/lib/active_resource/base.rb
+++ b/activeresource/lib/active_resource/base.rb
@@ -111,6 +111,22 @@ module ActiveResource
       attributes[self.class.primary_key] = id
     end
 
+    # True if and only if +other+ is the same object or is an instance of the same class, is not new?, and has the same id.
+    def ==(other)
+      other.equal?(self) || (other.instance_of?(self.class) && !other.new? && other.id == id)
+    end
+
+    # Delegates to ==
+    def eql?(other)
+      self == other
+    end
+
+    # Delegates to id in order to allow two resources of the same type and id to work with something like:
+    #   [Person.find(1), Person.find(2)] & [Person.find(1), Person.find(4)] # => [Person.find(1)]
+    def hash
+      id.hash
+    end
+
     def save
       new? ? create : update
     end