Selecting outer leaf nodes

[JanStevens]

Hello,

I'm missing a functionality for only selecting the outer leaf nodes of the tree without selecting nodes that act as a parent. The following method will fetch the outer leafs that are not a parent.

def all_leafs
    all = []
    self.children.each do |category|
      all << category if category.children.empty?
      root_children = category.all_leafs.flatten
      all << root_children unless root_children.empty?
    end
    # if there are no leafs then include itself
    all << self if self.children.empty?
    return all.flatten
end

I use it in combination with
(some tree model).map { |period| period.all_leafs.map(&:id).uniq }.flatten

Maybe this could be added (the concept) in a better way then recursively looping through the tree. Or is there a method that already returns the outer leaf nodes?

[mceachen]

Sorry for the delay.

It turns out that .leaves is already available on your model! See https://github.com/mceachen/closure_tree#class-methods

It looks like you wanted all the IDs for your leaf nodes. That's just:

Tag.leaves.pluck(:id)