我的应用程序正常工作，因为我的 4条记录在我的表单中已经包含相同的字段（:name，:family_with），用户需要填写{{1} }。
（PS：我使用的是嵌套表格和cocoon gem）。
这是我的表格：
:name我在寻找的是，每次填充= f.simple_fields_for :families do |family|
= f.text_field :name
= f.collection_select :family_with, Family.where(family_id: @family), :id, :name, {include_blank: "Choose a name"}
时如何更新collection_select :family_with，以便我的f.text_field :name可以填充名称＆＃ 39;已插入每个collection_select :family_with。
我已经读过，我可以使用ajax或jQuery来完成它，但我会很感激任何代码解决方案。
答案 0 :(得分：0)
= f.collection_select :family_with, Family.all.where(family_id: @family), :id, :name, {include_blank: "Choose a name"},selected: f.object.family_with
答案 1 :(得分：0)
Not sure what you consider a "code solution" but if you mean through ruby/rails then you have to at least submit the form to get any updates in the collection_select
When I had to do something with dependent/dynamic select menus this page was very useful for me (involves jQuery): http://blog.kate-travers.com/dynamic-duos-dependent-select-with-jquery-and-rails/