Question

在带有form.select的表单中，我希望默认选择所有选项。我有年龄模型，显示所有年龄的形式，我希望默认选择所有选项。我的代码如下：

f.select(:age, options_for_select(Age.pluck(:age, :id) , :selected => @campaign.ages.pluck(:id)),{},{:multiple=>true , :required=>true})

Answer 1

试试这个：

f.select(:age, options_for_select(Age.pluck(:age, :id) , :selected => @campaign.ages.pluck(:id)),{:multiple=>true , :required=>true})

Answer 2

我通过检查做到了这一点。如果用户被创建为新记录，那么我选择了所有这些记录，如果是编辑，我只会显示所选的。正如下面的代码所说的那样：

<% if @campaign.new_record? %>
  <%= f.select(:age, options_for_select(Age.pluck(:age, :id), :selected => Age.pluck(:id) ), {}, {:multiple => true,:required => true ,:class => 'form-control'}) %>
<% else %>    
  <%= f.select(:age, options_for_select(Age.pluck(:age, :id), :selected => @campaign.ages.pluck(:id) ), {}, {:multiple => true,:required => true ,:class => 'form-control'}) %>
<% end %>

如何默认选择form_for选择所有值

2 个答案: