[Rails] check hash content ?

hi,
how can I make sure that 'customer_student' won't be pushed twice to the
hash in the following example ?

@potential_course_students = []
@selected_customers.each do |customer|
customer.customer_student.each do |customer_student|
if customer_student.display_name.include?(params[:term]) &&
! @potential_course_students.include?(customer_student)
@potential_course_attendees << customer_student
end
end
end unless params[:term].blank?

appreciate any help.
Thank you
Dani

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