Posted about 8 years ago. Visible to the public.

Do not try to "slice" on an ActionController::CookieJar

The cookies object in your controllers and views is a ActionController::CookieJar and even though that class inherits from Hash and often behaves like one, you can not call slice on it to select only a subset of cookies. Why? Because Hash#slice calls self.class.new -- which in case of a CookieJar just won't work.

Unfortunately, you can't even say cookies.to_hash and slice on that, just because CookieJar#to_hash is inherited from Hash and will just return self. Bummer.

You need to do it yourself, for example by using collect_hash:

Copy
my_keys = %w[ foo bar baz ] my_cookies = my_keys.collect_hash { |key| [ key, cookies[key] ] }

By refactoring problematic code and creating automated tests, makandra can vastly improve the maintainability of your Rails application.

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Arne Hartherz
Last edit:
about 8 years ago
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We are makandra and do test-driven, agile Ruby on Rails software development.
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Posted by Arne Hartherz to makandra dev
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