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    <p>Here's how you can pass a parameter around via the link_to method in order to, say, go to another form in order to create a new object with the passed parameter. This strategy would allow you to pass variables among actions in your controller and create objects with predefined attributes:</p> <p>Say you have a variable called <em>@foo</em> that you want to pass to your <em>new</em> controller action, and your <em>new</em> view contains a form for your user to fill out. In which case, you can use</p> <pre><code>&lt;%= link_to "Link Text", new_widget_path(:foo =&gt; @foo) %&gt; </code></pre> <p>which would store @foo in params[:foo], allowing you to use params[:foo] in your controller.</p> <p>Clicking on <em>Link Text</em> will direct Rails to the <em>new</em> action of your WidgetController. You can have</p> <pre><code>def new @widget = Widget.new(:foo =&gt; params[:foo]) end </code></pre> <p>which would define a new Widget object with the :foo attribute pre-filled with params[:foo].</p> <p>Then, in your <em>new.html.erb</em> view file, you can allow the user to create a new Widget object with this pre-defined <em>foo</em> attribute already filled out via a hidden form field:</p> <pre><code> &lt;%= form_for(@widget) do |f| %&gt; &lt;%= f.label :other_attribute %&gt;&lt;br /&gt; &lt;%= f.text_field :other_attribute %&gt; &lt;%= f.hidden_field :foo %&gt; &lt;%= f.submit %&gt; &lt;% end %&gt; </code></pre> <p>Allowing the user to create a new Widget object with a custom other_attribute and the <em>foo</em> attribute already filled out!</p>
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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