Question

我正在尝试以嵌套的形式验证:picture模型上user_items的存在。

item.rb的

  validates :name, presence: true, uniqueness: true
  validates :description, presence: true
  has_many :user_items, inverse_of: :item
  has_many :users, -> { uniq }, through: :user_items
  belongs_to :user

  accepts_nested_attributes_for :user_items
  validates_associated :user_items

user_item.rb

  belongs_to :user
  belongs_to :item, inverse_of: :user_items
  mount_uploader :picture, PictureUploader
  validates :picture, presence: true
  validate :picture_size

items_controller.rb

  def new
    @item = Item.new
    @item.user_items.build
  end

  def create
    @item = item.new item_params

    if @item.save
      redirect_to items_path, notice: "Thank you for your item request!"
    else
      render :new
    end
  end

  private

    def item_params
      params.require(:item).permit(:name, :description, :tag_list, user_items_attributes: [:picture]).merge(created_by: current_user.id)
    end

new.html.erb

<%= simple_form_for @item, html: { class: "create-item-form" } do |item_builder| %>
  <div class="well">
  <%= item_builder.input :name, required: false, error: false, label: "Item name" %>
  <%= item_builder.input :description, as: :text, required: false, error: false, label: "Description of item" %>
  <%= item_builder.input :tag_list, required: false, label: "Tags (these will help users find your item)" %>
  <%= item_builder.simple_fields_for :user_items do |user_item_builder| %>
    <%= user_item_builder.input :picture, as: :file, required: false, label: "Picture of you with this item" %>
  <% end %>
  </div>
  <div class="clearfix">
    <%= item_builder.submit 'Submit new item request', class: "btn btn-primary pull-right inherit-width" %>
  </div>
<% end %>

这不起作用。我提交了一份空白表格，只有名称和说明验证触发。

更新

奇怪的是，如果我在user_id的表单中添加一个hidden_field，验证将会起作用：

<%= user_item_builder.input :user_id, as: :hidden, input_html: { value: current_user.id } %>

这里发生了什么？

UPDATE2：

如果我更改了创建操作，验证似乎也有效：

  def create
    @item = item.new item_params
    @item.user_items.build
    if @item.save
      redirect_to items_path, notice: "Thank you for your item request!"
    else
      render :new
    end
  end

为什么我需要添加@item.user_items.build？这样做的正确方法是什么？

Rails - validates_associated不使用状态验证

0 个答案: