CODEWITHSUNDEEP
rubyobjectdictionaryhash
walking_the_cow
walking_the_cow

Reputation: 491

Ruby map to a hash with Hashie::Mash objects

I am trying to filter through an array of mashes(pseudo-objects using the Hashie::Mash gem) containing pages with parent_id's and self_id's. In this function I would like to create a new hash where I can index the children objects by the parent objects.

Here's what I'm trying:

(A parent object has a parent_id equal to zero.) ('hashies' is an array containing Hashie::Mash objects that have the page_id attributes)

page_hash = Hash[hashies.map { |page|
  if page.parent_id != "0" then [page.id, page] else [page.parent_id, page] end
}]

My desired output would be something as follows:

page_hash = {
  #<Hashie::Mash id="978835" parent_id="0"> => [
    #<Hashie::Mash id="980705" parent_id="978835">,
    #<Hashie::Mash id="1049260" parent_id="978835">
  ]
}

But instead, it seems I'm just altering the Hashie::Mash objects themselves, and changing their parent_id's and id's. Here's my actual output:

page_hash = {
  #<Hashie::Mash id="1049100" parent_id="1044858"> => 
    #<Hashie::Mash id="1049100" parent_id="1044858">
}

Upvotes: 0

Views: 1487

Answers (1)

Nick Veys
Nick Veys

Reputation: 23949

Try something like this:

by_id = hashies.group_by(&:id)
page_hash = hashies.group_by { |page| by_id[page.parent_id] }

Upvotes: 0

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