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我如何可以截斷值在collection_selectcollection_select截斷
<%= collection_select(:standard, :parent_id, Standard.all, :id, :value, {:include_blank => 'No Parent'}) %>
我想有值縮短,但我得到的錯誤與此:
<%= collection_select(:standard, :parent_id, Standard.all, :id, truncate(:value, :length => 40), {:include_blank => 'No Parent'}) %>