[Solved] What is # on Ruby on Rails?

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@name represents an array of single object of Quest model. To get the id of that object, use 

 <p><%= @name.first.id %></p>

or change your controller code to 

@name = Quest.where(category: 'cat1').sample

and then do 

<p><%= @name.id %></p>

solved What is #<..> on Ruby on Rails?