如何使用cocoon gem屏蔽输入？

gem 'cocoon'

<%= form_for @model do |f| %>
  <%= f.fields_for :nested_models do |nested_form| %>
    <%= render 'nested_model_fields', f: nested_form %>
    <%= nested_form.link_to_remove_association '删除', class: 'btn btn-danger' %>
  <% end %>
  <%= f.link_to_add_association '添加', :nested_models, class: 'btn btn-primary' %>
  <%= f.submit '保存', class: 'btn btn-success' %>
<% end %>

<div class="nested-fields">
  <%= f.label :name %>
  <%= f.text_field :name %>
</div>

def new
  @model = Model.new
  @model.nested_models.build
end

def model_params
  params.require(:model).permit(:attribute1, :attribute2, nested_models_attributes: [:id, :name, :_destroy])
end