Question

I have this edit form.

But when I store something such as 1.5, I would like to display it as 1.50.

How could I do that with the form helper? <%= f.text_field :cost, :class => 'cost' %>

Answer 1

You should use number_with_precision helper. See doc.

Example:

number_with_precision(1.5, :precision => 2)
=> 1.50 

Within you form helper:

<%= f.text_field :cost, :class => 'cost', :value => (number_with_precision(f.object.cost, :precision => 2) || 0) %>

BTW, if you really want to display some price, use number_to_currency, same page for doc (In a form context, I’d keep number_with_precision, you don’t want to mess up with money symbols)

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