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POCount an Attribute on a nested form?
 

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  1. POCount an Attribute on a nested form?
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    <p>Rails 3.2.12 and Ruby 1.9.3 and Haml</p> <p>I would like to use the count of attribute to control the display of a 'link_to "remove"', but I am having problems with setting up the logic.</p> <p>Following is some code from my form as it is currently:</p> <pre><code> .field = codeline.label :name, "Units Alloc" %br/ = codeline.text_field :units_alloc, :precision =&gt; 6, :scale =&gt; 2, :size =&gt; 10, :class =&gt; "ui-state-default" = codeline.hidden_field :_destroy = link_to "remove", '#', class: "remove_fields" </code></pre> <p>this works well but I have the 'remove' link showing up and I would prefer it to only show if there are two :units_alloc attributes.</p> <p>This is what I tried:</p> <pre><code> .field = codeline.label :name, "Units Alloc" %br/ = codeline.text_field :units_alloc, :precision =&gt; 6, :scale =&gt; 2, :size =&gt; 10, :class =&gt; "ui-state-default" - if :units_alloc.count &gt; 1 = codeline.hidden_field :_destroy = link_to "remove", '#', class: "remove_fields" </code></pre> <p>and here is my error:</p> <pre><code> NoMethodError in Contracts#new Showing /home/tom/rails_projects/tracking/app/views/contracts /_codeline_fields.html.haml where line #9 raised: undefined method `count' for :units_alloc:Symbol </code></pre> <p>if I use units_alloc in the argument instead of the symbol, I still get an error:</p> <pre><code> NameError in Contracts#new Showing /home/tom/rails_projects/tracking/app/views/contracts /_codeline_fields.html.haml where line #9 raised: undefined local variable or method `units_alloc' for #&lt;#&lt;Class:0xadbde90&gt;:0xa8956e8&gt; </code></pre> <p>I tried to use 'codeline.units_alloc' but this did not work and the same error was flagged.</p> <p>Any suggestions, or pointers to help me resolve this issue?</p> <p>Thanks.</p> <p>Solution: Thanks to James Scott Jr.</p> <p>app/controller/contracts_controller.rb</p> <pre><code> def New @show_remove = false .... .... end </code></pre> <p>app/views/contracts/_codelines_fields.html.haml</p> <pre><code> .field = codeline.label :name, "Units Alloc" %br/ = codeline.text_field :units_alloc, :precision =&gt; 6, :scale =&gt; 2, :size =&gt; 10, :class =&gt; "ui-state-default" - if @show_remove = codeline.hidden_field :_destroy = link_to "remove", '#', class: "remove_fields" - else - @show_remove = true </code></pre> <p>And that did it ... the remove button only shows in the second and subsequent row of attributes.</p>
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