Can store hash in a cookie?

Question

Anyone know if I can put a hash in the cookie? Something like this: cookies [: test] = {: top => 5,: middle => 3,: bottom => 1}

Thanks

Answer 1

With Rails 4.1 I had to use the parentheses like this. Without that it gave an error.

cookies[:test] = JSON.generate({a: 1, b: "2", hello: "world"})

Answer 2

I woud look into serializing the hash to store it. Then deserialize it to retrieve it.

When you serialize a hash, the result will be an encoded string. This string can be decoded to get the original object back.

You could use YAML or JSON for this. Both are nicely supported in Ruby.

---

A YAML example

require "yaml"

cookies[:test] = YAML::dump {a: 1, b: "2", hello: "world"}
# => "---\n:a: 1\n:b: '2'\n:hello: world\n"

YAML::load cookies[:test]
# => {a: 1, b: 2, c: "world"}

---

A JSON example

require "json"

cookies[:test] = JSON.generate {a: 1, b: "2", hello: "world"}
# => '{"a":1,"b":"2","hello":"world"}'

JSON.parse cookies[:test]
# => {"a"=>1, "b"=>"2", "hello"=>"world"}

Note: when using JSON.parse, the resulting object will have string-based keys