Froze rails gems

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

diff --git a/vendor/rails/activesupport/lib/active_support/core_ext/hash/slice.rb b/vendor/rails/activesupport/lib/active_support/core_ext/hash/slice.rb
new file mode 100644 (file)
index 0000000..88df49a
--- /dev/null
+++ b/vendor/rails/activesupport/lib/active_support/core_ext/hash/slice.rb
@@ -0,0 +1,33 @@
+module ActiveSupport #:nodoc:
+  module CoreExtensions #:nodoc:
+    module Hash #:nodoc:
+      # Slice a hash to include only the given keys. This is useful for
+      # limiting an options hash to valid keys before passing to a method:
+      #
+      #   def search(criteria = {})
+      #     assert_valid_keys(:mass, :velocity, :time)
+      #   end
+      #
+      #   search(options.slice(:mass, :velocity, :time))
+      #
+      # If you have an array of keys you want to limit to, you should splat them:
+      #
+      #   valid_keys = [:mass, :velocity, :time]
+      #   search(options.slice(*valid_keys))
+      module Slice
+        # Returns a new hash with only the given keys.
+        def slice(*keys)
+          keys = keys.map! { |key| convert_key(key) } if respond_to?(:convert_key)
+          hash = self.class.new
+          keys.each { |k| hash[k] = self[k] if has_key?(k) }
+          hash
+        end
+
+        # Replaces the hash with only the given keys.
+        def slice!(*keys)
+          replace(slice(*keys))
+        end
+      end
+    end
+  end
+end