Is this good for a conditional checkbox?

Rails
1

i’m pretty new to RoR and the MVC style of programming in general. i
have one page with a list of applications that several users can
access. in my view, i have a conditional that decides whether the
checkbox is checked or unchecked. being new to this, i just did it the
only way i could think of and want to see if there’s a better way of
accomplishing it.

<%
selected_app = @user.apps.detect{ |app| app.id == app_line.id }
if selected_app
is_checked = ‘checked’
else
is_checked = nil
end
-%>

<%= app_line.name %> <%= check_box 'add_app', app_line.id, { :checked => is_checked }, 'yes', 'no' %>