Question

I have a form which accepts URL params (to support a bookmarklet) which looks and works like this:

<%= f.url_field :url, :value => params[:u] %>

However, when re-rendered (in case of a validation error, for instance, the content is stripped out.

What I’d like to do is put something like this, so that :value => is only rendered if there are params in the first place:

<%= f.url_field :url, :value => params[:u] if params[:u] %>

Of course this doesn’t even render the field and is wrong.

How do I add if/unless conditionals into an ERB block? Endless searching hasn’t turned up much, but I’m probably searching for the wrong thing.

Answer 1

Farnoy’s answer was very close, but more specifically it was:

<%= f.url_field :url, :value => (params[:u] || @resource[:url]) %>

As @resource was the model object.