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POHow to check if an attribute value has been set during the process flow?
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  1. POHow to check if an attribute value has been set during the process flow?
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    copied!<p>I am using Ruby on Rails 3.2.2 and I would like to know if there is a way to check if an attribute value has been <em>set</em> during the process flow. That is, I have an <code>Article</code> class with attributes <code>title</code>, <code>content</code>, <code>updater_user_id</code>.</p> <p>In my controller I have:</p> <pre><code># @article.title # =&gt; "Sample title" # @article.content # =&gt; "Sample content" # @article.updater_user_id # =&gt; 1 # @current_user.id # =&gt; 1 # Note: This value is the same as '@article.updater_user_id' @article.updater_user_id = @current_user.id # params[:article] # =&gt; {:article =&gt; {:title =&gt; 'Sample title 2', :content =&gt; 'Sample content 2'}} @article.update_attributes(params[:article]) </code></pre> <p>I tried to use the <a href="http://apidock.com/rails/ActiveModel/Dirty/changed" rel="nofollow"><code>@article.changed</code></a> method but it doesn't work as I would like it to work. In fact, that method returns:</p> <pre><code>@article.changed # =&gt; ['title', 'content'] # Note: There isn't the 'updater_user_id' attribute </code></pre> <p><em>In other words, I would like to check if the <code>updater_user_id</code> has been set during the process flow even if that value has not changed.</em> My use case is that I would like to <em>require</em> that the <code>updater_user_id</code> is set (at least one time) during the process flow before to save an <code>Article</code> object; if it is not set during the process flow, then I would like to raise an error or something like that.</p> <p><strong>Is it possible? If so, how to make that?</strong></p>
 

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