Question

A have a hash-table with countries in it like this:

@countries = {'United States' => 'US', 'France' => 'FR'} 

and I use the following code to display it in a select box:

<%= select_tag 'countries', 
            options_for_select(@countries.to_a) %>

Now when it saves data in my table I got in my row US, UK…and so on, now the problem is when I want to output data, so instead of US I would like to output ‘United States’ I use:

<%=h @countries[@offer.from_country] %>

But the first hash-table cannot work and I have to reverse the order and use:

@countries = {'US' => 'United States', 'FR' => 'France'} 

Any ideas on how to have the same hash-table for both displaying the data in the select box, and then on the show page?

Answer 1

Use invert on your hash. It exchanges keys and values:

{:a => '1', :b => '2'}.invert
=> {"1"=>:a, "2"=>:b}

Your example:

<%=h @countries.invert[@offer.from_country] %>