Enable Cookies

Hanami applies “batteries included, but not installed” philosophy. Cookies are a feature that is present but needs to be activated.

In our application settings there is a line to uncomment.

# apps/web/application.rb
module Web
  class Application < Hanami::Application
    configure do
      # ...
      cookies true
    end
  end
end

From now on, cookies are automatically sent for each response.

Settings

With that configuration we can specify options that will be set for all cookies we send from our application.

• :domain - String (nil by default), the domain
• :path - String (nil by default), a relative URL
• :max_age - Integer (nil by default), cookie duration expressed in seconds
• :secure - Boolean (true by default if using SSL), restrict cookies to secure connections
• :httponly - Boolean (true by default), restrict JavaScript access to cookies

Usage

Cookies behave like a Hash: we can read, assign and remove values.

# apps/web/controllers/dashboard/index.rb
module Web
  module Controllers
    module Dashboard
      class Index
        include Web::Action
        def call(params)
          cookies[:b]         # read
          cookies[:a] = 'foo' # assign
          cookies[:c] = nil   # remove
          cookies[:d] = { value: 'foo', path: '/bar' } # assign with options
        end
      end
    end
  end
end

When setting a value, a cookie can accept a String or a Hash to specify inline options. General settings are applied automatically but these options can be used to override values case by case.

Example

# apps/web/application.rb
module Web
  class Application < Hanami::Application
    configure do
      # ...
      cookies max_age: 300 # 5 minutes
    end
  end
end

We’re going to set two cookies from the action: the first will inherit application configuration, while the second overrides the default value.

# apps/web/controllers/dashboard/index.rb
module Web
  module Controllers
    module Dashboard
      class Index
        include Web::Action
        def call(params)
          # Set-Cookie:a=foo; max-age=300; HttpOnly
          cookies[:a] = 'foo'
          # Set-Cookie:b=bar; max-age=100; HttpOnly
          cookies[:b] = { value: 'bar', max_age: 100 }
        end
      end
    end
  end
end