Question

I have the following code in my application.erb file:

<%= hidden_div_if(@cart.line_items.empty?, :id => "cart") do %>

This works fine unless I load a page that does not receive the @cart.line_items object, when I receive the following error:

undefined method `line_items' for nil:NilClass

How do I rewrite the line from my .erb file to have it behave the same if @cart.line_items is empty and if @cart is nil?

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Based on the below answers, I changed my code to use:

<%= hidden_div_if(!@cart.nil? && @cart.line_items.empty?, :id => "cart") do %>

*Updated to match the comment Baldrick added to this question (as it is more concise than my original edit).

Answer 1

Use @cart.blank? to check whether it is nil or empty. The blank? method is a rails extension.