Apply custom behaviour for first/last slot

[BigBigDoudou]

I have a "breadcrumb" component that has many "items", for example (simplified):

render BreadcrumbComponent.new do |breadcrumb|
  breadcrumb.item("animal")
  breadcrumb.item("feline")
  breadcrumb.item("cat")
end

# animal / feline / cat

And the implementation looks like:

class BreadcrumbComponent
  renders_many :items, "BreadcrumbItemComponent"

  def call
    tag.ul do
      items.each { |item| concat(item) }
    end
  end

  class BreadcrumbItemComponent
      def initialize(item, active: false)
        # ...
      end
  end
end

I need the last item to have the class "active", but I don't find a way to do it. Any clue?

[Spone]

Something like this maybe?

items.each do |item|
  if item == items.first
    # first item behavior
  elsif item == items.last
    # last item behavior
  else
    # other items behavior
  end
end

[BigBigDoudou]

The problem was about passing argument to the component. But I found the solution (cf comment below).

[BigBigDoudou]

I found the solution and it was surprisingly easy, I just needed an attr_writer:

class BreadcrumbComponent
  renders_many :items, "BreadcrumbItemComponent"

  def call
    tag.ul do
      items.last.active = true
      items.each { |item| concat(item) }
    end
  end

  class BreadcrumbItemComponent
      attr_writer :active

      def initialize(item)
        @item = item
      end

     def call
       html_class = +"breadcrumb"
       html_class << " active" if @active
        tag.li(@item, class: html_class)
      end
  end
end

[Spone]

items.each { |item| concat(item) }

By the way, I guess you can replace this with the following:

safe_join(items)