在rails中使用嵌套表单时出现错误

<%= form_for @parent_model do |f| %>
  <%= f.fields_for :child_models do |child_form| %>
    <%= child_form.text_field :attribute_name %>
  <% end %>
  <%= f.submit %>
<% end %>

class ParentModel < ApplicationRecord
  has_many :child_models
  accepts_nested_attributes_for :child_models
end

def parent_model_params
  params.require(:parent_model).permit(:attribute_name, child_models_attributes: [:id, :attribute_name, :_destroy])
end

<%= form_for @parent_model do |f| %>
  <%= f.text_field :attribute_name %>
  <%= f.fields_for :child_models do |child_form| %>
    <%= child_form.text_field :attribute_name %>
  <% end %>
  <%= f.submit %>
<% end %>