Is this good for a conditional checkbox?

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| == }
if selected_app
is_checked = ‘checked’
is_checked = nil

<%= %> <%= check_box 'add_app',, { :checked => is_checked }, 'yes', 'no' %>

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