ruby-on-rails - rails generic fields_for - 强制子索引

Question

模型

class Person < AR

end

控制器

def new
  @people = []
  3.times {@people << Person.new)
end

看法

=form_tag :people_form do
 -@people.each_with_index do |person, i|
   =fields_for :person, person do |person_fields|
    =person_fields.text_field :name

很明显，这将为每个人生成相同的 html (name = people_form[person][name])。有没有办法让它插入索引，所以每个人的 for 都是唯一的？（没有 javacript hack）。

例如，如果我能让它生成这样的东西会很好：

<input name='people_form[0][name]' />
<input name='people_form[1][name]' />

Answer 1

比你想象的更简单

=form_tag :people_form do
 -@people.each_with_index do |person, i|
   =fields_for "people_form[#{i}]", person do |person_fields|
    =person_fields.text_field :name

Answer 2

从 Rails 6 开始，您可以使用该index选项。

fields_for :person, person, index: i do |person_fields|