CODEWITHSUNDEEP
ruby-on-railsruby
mattC
mattC

Reputation: 373

Rails - Filtering two arrays based on an attribute

I have a Term model which includes attributes :title (which is simply a title), as well as :accepted, and :pending (which are boolean values to tell if a Term has been approved by a moderator). On my index page, the Terms are split up by their :accepted attribute and stored in arrays called @accepted and @pending.

There can be multiple Terms with the same :title, however, only one of these can be accepted.

What I am unsuccessfully trying to do is filter the two arrays by the :title attribute so that if a term appears in the @approved array, it doesn't appear in the @pending array.

So if I have:

@accepted = [{title: "TERM1", accepted: true, pending: false}]
@pending  = [{title: "TERM1", accepted: false, pending: true}, {title: "TERM2", accepted: false, pending: true}, {title: "TERM2", accepted: false , pending: true}]

After filtering, @pending will contain only the second and third objects (i.e. all that do not have the title "TERM1").

How would I perform this filter?

Upvotes: 0

Views: 463

Answers (1)

Ursus
Ursus

Reputation: 30056

Try this one

accepted_terms_titles = @accepted.map { |t| t[:title] }
@pending.reject! { |t| accepted_terms_titles.include?(t[:title]) }
  1. Collect all the titles for accepted terms
  2. Filter out in the @pending array the terms whose title is included in the accepted_terms_titles array

Upvotes: 1

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