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Editorial Team
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Asked: 2026-05-21T16:02:42+00:00

Two-part question: I am using acts_as_taggable_on, and I want to generate an array of

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Two-part question:

I am using acts_as_taggable_on, and I want to generate an array of all the tags used on all the records of a particular Model. But I want that list to not contain duplicates.

When I select a tag, I generate a list of all records that are tagged by that tag. How do I then generate a list of all the other tags that belong to that list of records (also not with duplicates?)

In other words, how do I, for a subset of records, show all the associated tags (minus, of course, the tag that generated that subset?)

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1 Answer

  1. Editorial Team

    does this answer? http://www.ruby-doc.org/core/classes/Array.html#M000277

    a = [ "a", "a", "b", "b", "c" ]
a.uniq!   #=> ["a", "b", "c"]

    and for your second question http://www.ruby-doc.org/core/classes/Array.html#M000273

    [ 1, 1, 2, 2, 3, 3, 4, 5 ] - [ 1, 2, 4 ]  #=>  [ 3, 3, 5 ]
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