Ruby: why isn't my member set in initialize?

Question

I have trouble understanding why my below code fails partially. I try to create Liquid tag for Jekyll. While the the class member "text" is set, the member "xyz" is not set at all. But why?

module MyModule
  class MyTag < Liquid::Tag
    def initialize(tag_name, text, tokens)
      super
      @text = text
      @xyz = "HELLO"
    end

    def render(context)
      "Output  #{@text} #{@xyz}"
    end
  end
end

Liquid::Template.register_tag('my_tag', MyModule::MyTag)

With calling the following

{% my_tag de 1234 %}

The output of the above is:

Output de 1234

I expected there would be "HELLO" as well, like:

Output de 1234 HELLO

What do I miss?

The original code from the Liquid class is here.

Judging from the code, I'd expect "Output de HELLO", not "Output de 1234 HELLO". — Sergio Tulentsev, Nov 16 '16 at 10:26
@SergioTulentsev No, it's exactly like I wrote above. The argument is taken as a full string. You have to split the arguments on your own with Liquid (people say). — Christian, Nov 16 '16 at 10:28
Whats happen if you change `"Output #{@text} #{@xyz}"` to `"Output #{@text} '#{@xyz}'"`? — Timo Schilling, Nov 16 '16 at 10:34

score 2 · Answer 1 · answered Nov 16 '16 at 10:32

Your code seems to work fine with Ruby 2.1.5 and liquid-3.0.6 :

require 'liquid'
module MyModule
  class MyTag < Liquid::Tag
    def initialize(tag_name, text, tokens)
      super
      @text = text
      @xyz = "HELLO"
    end

    def render(context)
      "Output  #{@text} #{@xyz}"
    end
  end
end

Liquid::Template.register_tag('my_tag', MyModule::MyTag)

@template = Liquid::Template.parse("{% my_tag de 1234 %}")
puts @template.render
#=> "Output  de 1234  HELLO"

I can confirm I have the same output running it from the CLI. It's still broken when using it combined with Jekyll. — Christian, Nov 16 '16 at 10:38

Ruby: why isn't my member set in initialize?

1 Answers1