@course=@user.courses.where("is_delete = 0 and #{Course.table_name}.id != #{homework.course_id} and #{Course.table_name}.id = #{params[:search].to_i} or #{Course.table_name}.name like :p",:p=>search).select{|course|@user.allowed_to?(:as_teacher,course)}
@course=@user.courses.where("is_delete = 0 and #{Course.table_name}.id != #{homework.course_id} and #{Course.table_name}.id = #{params[:search].to_i} or #{Course.table_name}.name like :p",:p=>search).select{|course|@user.allowed_to?(:as_teacher,course)}