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提交带有不在模型中的字段的Rails表单

我需要提交一个表格,并且选择一个不属于该模型的表格。保存动作后,我需要将此值用于其他操作,但出现错误:

undefined method `tecnico' for #<Interventi:0x9802cf8>
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这是我表格的一部分:

<%= form_for :interventi, url: welcome_nuovointerventosalva_path do |f| %>

<div class="row">


    <div class="col-md-2">
        <%= f.label :data, 'Data creazione' %>
  <div class="form-group input-group">
    <span class="input-group-addon"> <i class="fa fa-calendar"></i> </span>
    <%= f.text_field :data, :class => "date-picker form-control input-mini", readonly: true, :value => Time.now.strftime("%Y/%m/%d")  %>
    <!--<span class="help-block">formato YYY-MM-DD</span> -->
  </div>
    </div>

    ....................................
    ....................................

    <div class="col-md-3">
        <%= f.label 'Tecnico' %>
        <div class="form-group input-group">
            <%= f.select :tecnico, options_for_select(@tecnici.collect{ |tec| [tec.nome, tec.id] }), {}, class: 'form-control search-select' %>
        </div>
    </div> …
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forms ruby-on-rails

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