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POForms to create and update Mongoid array fields
 

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    <p>I've been struggling to create a form for a Mongoid model that has an array field. I want my form to have on text box per entry in the array. If I'm creating a new record, the default will be one empty field (and some javascript to add new fields dynamically on the page).</p> <p>I've searched around for a solution using fields_for but it seems that is more intended to handle the case where you have an array of objects/models and not the case I have, which is an array of strings. </p> <p>I'm going to use the example of a person and a phone number. </p> <pre><code>class Person include Mongoid::Document field :name, :type =&gt; String field :phone_numbers, :type =&gt; Array end </code></pre> <p>For the controller, just assume the typical controller but in the <code>new</code> method I initialized the phone_number array with one blank string.</p> <p>Here's the form code:</p> <pre><code> &lt;%= form_for(@person) do |f| %&gt; &lt;div class="field"&gt; &lt;%= f.label :name %&gt;&lt;br /&gt; &lt;%= f.text_field :name %&gt; &lt;/div&gt; &lt;div class="field"&gt; &lt;%= f.label :phone_numbers %&gt;&lt;br /&gt; &lt;% @person.phone_numbers.each do |phone_number| %&gt; &lt;%= text_field_tag "person[phone_numbers][]", phone_number %&gt; &lt;% end %&gt; &lt;/div&gt; &lt;% end %&gt; </code></pre> <p>This all works fine. There are a few things that I don't like. </p> <ul> <li>The hardcoded name of the field in the text_field_tag call.</li> <li>Using text_field_tag instead of f.text_field</li> <li>Having the feeling like I should somehow be using fields_for instead of this</li> </ul> <p>Does anybody have any better suggestions on how to implement this? Or would you consider this correct?</p>
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