Slots don't get rendered unless any param is passed to them

[arg]

I'm not sure is this a normal behavior or bug. Here is what I have:

- # somewhere in app/views/layouts/application.html.haml
= render Header.new do |c|
  - c.logo
  - c.navigation_link('link', 'url')
  - c.navigation_link('link 2', 'url2')

class Header < ViewComponent::Base
  renders_one :logo, Header::Logo
  renders_many :navigation_links, Header::NavigationLink
end

- # app/view_components/header.html.haml (markup is omitted)
= logo
- navigation_links.each do |link|
  = link

class Header::Logo < ViewComponent::Base
  def call
    'logo' # markup is omitted too. It's just some static content
  end
end

Header::Logo renders static HTML, so it doesn't receive any params when rendering Header component. But for some reason, it doesn't get rendered. If I pass anything to it like:

- # somewhere in app/views/layouts/application.html.haml
= render Header.new do |c|
  - c.logo(1, 2, 3)
...

it will be rendered, no matter what params are passed and even if technically Header::Logo shouldn't accept any params since I didn't define them in Header::Logo#initicalize (actually there is no #initialize method).

Is this normal behavior or bug? IMO if we call #logo in component's template, it should render the slot regardless of passed (or not) parameters.

[boardfish]

This is normal behavior, but I agree with you that it's unintuitive.

In the meantime, you can define a method logo on your component that returns the component you want to render in the slot, and it ought to work in the same way so long as you call it in a <%= %> tag.

I'll verify that this is the case and update this answer soon.