Question

我有一个Profile模型，我正在尝试查看该个人资料是否在过去使用过任何其他名称。我想出了添加AdditionalName模型的方法，其关联为Profile has_many AdditionalName。在表格中，我希望他们填写最多5个其他名称。我从this question看到可以建立x.times，并使用f.fields_for :additional_names显示5个其他名称。问题是，即使我没有填写任何内容，也将在我提交表单时保存全部5个信息。 AdditionalName记录是否只有在输入字段中填写内容时才保存？

additional_name.rb

class AdditionalName < ApplicationRecord
  belongs_to :profile
end

profile.rb

class Profile < ApplicationRecord
  has_many :additional_names
  accepts_nested_attributes_for :additional_names
end

控制器：

def new
existing_additional_names = @profile.additional_names.count
(5 - existing_additional_names).times do
  @current_object.additional_names.build
end

表格：

<%= form_with model: @profile, url: wizard_path, method: :patch, local: true do |f| %>
  <div class="form-row">
    <%= f.fields_for :additional_names do |additional_names_form| %>
      <%= additional_names_form.hidden_field :id %>
      <div class="form-group col-md-6">
        <div class="mx-auto">
          <%= additional_names_form.label :name, "Full name" %>
          <%= additional_names_form.text_field :name, class: "form-control", id: "ignore-button-disable" %>
        </div>
      </div>
    <% end %>
  </div>
  <div class="row">
    <div class="col-md-6 my-2">
      <%= f.submit 'Continue', class: 'btn btn-primary w-100' %>
    </div>
  </div>
<% end %>

Answer 1

如果只希望在设置了特定属性的情况下才创建嵌套记录，则不需要自定义逻辑。您可以在模型中通过lambda调用选项:reject_if到accepts_nested_attributes_for进行调用。

根据定义：

允许您指定Proc或Symbol指向一种方法，该方法检查是否应为特定属性哈希构建记录。

 accepts_nested_attributes_for :additional_names,
                               reject_if: -> { |attributes| attributes['name'].blank? }

Answer 2

我只需要覆盖模型中的additional_names_attributes=：

def additional_names_attributes=(additional_name_attributes)
  additional_name_attributes.values.each do |additional_name_attribute|
    unless additional_name_attribute[:name].empty?
      additional_name = AdditionalName.find_or_create_by(additional_name_attribute)
      self.additional_names << additional_name
    end
  end
end

Rails has_many表单可以选择创建多个记录

2 个答案: