Question

我正在跟踪一个railscast，试图创建一个添加链接来添加一个与多对多关联相关的值。我使用模型而不是

实现了多对多的唯一区别

has_and_belongs_to_many.

它并没有那么好用。
（presenetation很好，但添加按钮失败。）

这是我的代码

档案：ingredient_recipe.rb

class IngredientRecipe < ActiveRecord::Base
  attr_accessible :created_at, :ingredient_id, :order, :recipe_id
  belongs_to :recipe
  belongs_to :ingredient
end

文件：ingredient.rb

class Ingredient < ActiveRecord::Base
 has_many :ingredient_recipes
 has_many :recipes, :through => :ingredient_recipes
 ...

文件：recipes.rb

class Recipe < ActiveRecord::Base
 has_many :ingredient_recipes
 has_many :ingredients, :through => :ingredient_recipes
 ...

 <%= link_to_add_fields "Add", f, :ingredient_recipes %>

定义方法

def link_to_add_fields(name, f, association)
 new_object = f.object.class.reflect_on_association(association).klass.new
 fields = f.fields_for(association, new_object, :child_index => "new_#{association}") do |builder|
   render(association.to_s.singularize + "_fields", :f => builder)
 end
 link_to_function(name, "add_fields(this, \"#{association}\", \"#{escape_javascript(fields)}\")")
end

问题

的
渲染（association.to_s.singularize +“_ fields”，：f =＆gt; builder）显示器
＆lt;％= f.text_field：name％＆gt; ＆lt;％= f.hidden_field：_destroy％＆gt; ＆lt;％= link_to“x”，“”，类：“remove_fields”％＆gt; 并打印错误

 ActionView::Template::Error (undefined method `name' for #<IngredientRecipe:0x6393ee8>):

任何想法？

Answer 1

不完全确定是不是这样，但由于它试图在ingredient_recipe对象上调用name，您是否尝试更改方法中传递的符号？

 <%= link_to_add_fields "Add", f, :ingredients %>

rails - 为多对多添加值

1 个答案: