find duplicates in each array rails

Question

<% @sp_references.each do |sp_ref| %>
<% sp_ref.all_references.each_with_index do |tax_ref, i| %> <%if (tax_ref.reference.uniq) && (tax_ref.reference !~ /emend$/i) %> <%= tax_ref.reference %> <%end%> <%end%> <%end%>

This 'uniq' option to get distinct elements in tax_ref.reference is not working. It shows "undefined method `uniq' for #

score 0 · Answer 1 · answered Nov 29 '10 at 15:40

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It seems to me like tax_ref.reference is not an array. uniq should be called on arrays. Try this instead:

<% sp_ref.all_references.keys.uniq.each do |tax_ref| %>
    <%if (tax_ref.reference !~ /emend$/sp_ref.all_references[tax_ref]) %>
        <%= tax_ref.reference %>
    <%end%>
<% end %>

answered Nov 29 '10 at 15:40

David Sulc

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What is sp_ref.all_references ? It's not a hash (like I thought). – David Sulc Nov 29 '10 at 15:58

score 0 · Answer 2 · edited May 23 '17 at 12:04

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uniq is a method on any enumerable object (arrays). So you can't call it on the reference object of tax_ref.

Instead, you'll want to call it on sp_ref.all_references, like sp_ref.all_references.uniq.each

This SO Question has some suggestions on filtering out duplicate objects when only an attribute is duplicated (not unique).

edited May 23 '17 at 12:04

Community

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answered Nov 29 '10 at 15:41

Jesse Wolgamott

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It doesnt extract 'uniq' distinct elements in tax_ref.reference. – Palani Kannan Nov 29 '10 at 15:49
I believe this is because the objects are not duplicate. They have a duplicate attribute that you are perceiving to be duplicate. – Jesse Wolgamott Nov 29 '10 at 21:33

score 0 · Answer 3 · answered Dec 01 '10 at 08:13

<%arr = Array.new %> <% @sp_references.each do |sp_ref| %> <% sp_ref.all_references.each_with_index do |tax_ref, i| %>  <%if (tax_ref.reference !~ /emend$/i) %>  <% arr.push("#{tax_ref.reference}") %> <%end%>  <%end%>  <%end%> <%= arr.uniq %>

It works for me.

find duplicates in each array rails

3 Answers3