safe nil in rails views.

If you know grails, there is a feature like this: <% user.name? %> that prevents to chek if the value is null or not. In rails view I have to do <% if user.name %>   <%= user.name %> <% end %> to display user.name if it is not nil. There is a shortcut or some feature like that in grails?

user.presence || “”

see http://rubydoc.info/docs/rails/3.0.0/Object:presence

And if user can potentially be nil, you can also use

user.try(:presence) || “”

This will avoid “undefined method ‘presence’ for nil:NilClass” errors.

Not a general solution I know, but in such a situation I supply a method of User, display_name, that returns the name or empty string (or "Unknown" possibly, dependent on requirement).

Colin

Msan Msan wrote:

If you know grails, there is a feature like this: <% user.name? %> that prevents to chek if the value is null or not. In rails view I have to do <% if user.name %>   <%= user.name %> <% end %> to display user.name if it is not nil. There is a shortcut or some feature like that in grails?

<% if user && user.name %>    ... ...

<%= user.name if user.name %> may be the most concise, or <%= user.name if user && user.name %> if user may be nil

Colin