Froze rails gems

[depot.git] / vendor / rails / activesupport / lib / active_support / core_ext / hash / diff.rb

diff --git a/vendor/rails/activesupport/lib/active_support/core_ext/hash/diff.rb b/vendor/rails/activesupport/lib/active_support/core_ext/hash/diff.rb
new file mode 100644 (file)
index 0000000..6abd678
--- /dev/null
+++ b/vendor/rails/activesupport/lib/active_support/core_ext/hash/diff.rb
@@ -0,0 +1,19 @@
+module ActiveSupport #:nodoc:
+  module CoreExtensions #:nodoc:
+    module Hash #:nodoc:
+      module Diff
+        # Returns a hash that represents the difference between two hashes.
+        #
+        # Examples:
+        #
+        #   {1 => 2}.diff(1 => 2)         # => {}
+        #   {1 => 2}.diff(1 => 3)         # => {1 => 2}
+        #   {}.diff(1 => 2)               # => {1 => 2}
+        #   {1 => 2, 3 => 4}.diff(1 => 2) # => {3 => 4}
+        def diff(h2)
+          self.dup.delete_if { |k, v| h2[k] == v }.merge(h2.dup.delete_if { |k, v| self.has_key?(k) })
+        end
+      end
+    end
+  end
+end