ruby-on-rails - 如何使用 Rails 3 中的 Mongoid 嵌入资源创建嵌套表单？

Question

我有一个食谱模型，其中嵌入了成分，使用 Mongoid。

class Recipe
  include Mongoid::Document
  include Mongoid::Timestamps

  field :title, :type => String
  embeds_many :ingredients

  accepts_nested_attributes_for :ingredients, :reject_if => lambda { |a| a[:title].blank? }, :allow_destroy => true

  validates :title, :presence => true
end

class Ingredient
  include Mongoid::Document
  field :name, :type => String
  field :quantity, :type => String

  embedded_in :recipe, :inverse_of => :ingredients
end

我希望能够同时创建一个新的食谱以及该食谱的相关成分，但我很难理解我将如何去做。这是我到目前为止所拥有的:

_form.html.erb - 在配方 View 中使用

<%= form_for @recipe do |f| %>  
...
  <li>Title: <%= f.text_field :title %></li>

  <% f.fields_for :ingredients do |builder| %>
    <%= render "ingredient_fields", :f => builder %>
  <% end %>
...
<%= f.submit %>

_ingredient_fields.html.erb

<%= f.text_field :name %>

配方 Controller

def new
  @recipe = Recipe.new
  @ingredient = @recipe.ingredients.build
end

def create
  @recipe = Recipe.new(params[:recipe])


  if @recipe.save
    redirect_to @recipe, notice: 'Recipe was successfully created.'
  else
    render action: "new"
  end
end

配料 Controller

def new
  @recipe = Recipe.find(params[:recipe_id])
  @ingredient = @recipe.ingredients.build
end

def create
  @recipe = Recipe.find(params[:recipe_id]) 
  @ingredient = @recipe.ingredients.build(params[:ingredient]) 
  # if @recipe.save 
end

这会呈现新的成分表单，但没有成分字段。谁能告诉我我做错了什么？

Answer 1

当您显示嵌套表单时，请尝试使用(注意等于):

<%= f.fields_for

而不仅仅是

<% f.fields_for

查看类似的question .