如何添加has_many：通過細節到一個表單RoR

我正在做的似乎是Ruby on Rails，食譜應用程序的常見學習應用程序。具體而言，將食譜和配料作爲has_many：through關係進行工作。通過查看一百多個示例和問題，我已經獲得了我的多對多關係設置和多模式表單的工作方式，但是我想添加一個附加字段並且無法使其工作。感覺就像我接近了解這些東西的工作原理。下面是簡單信息：如何添加has_many：通過細節到一個表單RoR

型號：

class Ingredient < ActiveRecord::Base 
    has_many :recipe_ingredients 
    has_many :recipes, :through => :recipe_ingredients 
end 

class RecipeIngredient < ActiveRecord::Base 
    belongs_to :recipe 
    belongs_to :ingredient 
end 

class Recipe < ActiveRecord::Base 
    has_many :recipe_ingredients 
    has_many :ingredients, :through => :recipe_ingredients 
    accepts_nested_attributes_for :ingredients, :recipe_ingredients 

    def new_recipe_ingredient_attributes=(recipe_ingredient_attributes) 
    recipe_ingredient_attributes.each do |attributes| 
     recipe_ingredients.build(attributes) 
    end 
    end 

    def existing_recipe_ingredient_attributes=(recipe_ingredient_attributes) 
    recipe_ingredients.reject(&:new_record?).each do |recipe_ingredient| 
     attributes = recipe_ingredient_attributes[recipe_ingredient.id.to_s] 
     if attributes 
     recipe_ingredient.attributes = attributes 
     else 
     recipe_ingredient.delete(recipe_ingredient) 
     end 
    end 
    end 

    def save_recipe_ingredients 
    recipe_ingredients.each do |recipe_ingredient| 
     recipe_ingredient.save(false) 
    end 
    end 
end

控制器：

def create 
    @recipe = Recipe.new(params[:recipe]) 
    if @recipe.save 
     redirect_to :action => 'show', :id => @recipe 
     flash[:notice] = "Your record has been saved." 
    else 
     render :action => 'new' 
    end 
end 

def update 
    params[:recipe][:existing_recipe_ingredient_attributes] ||= {} 
    @recipe = Recipe.find(params[:id]) 
    if @recipe.update_attributes(params[:recipe]) 
     redirect_to :action => 'show', :id => @recipe 
     flash[:notice] = "Your changes have been saved." 
    else 
     render :action => 'edit' 
    end 
end

查看：

對不起，我的代碼在牆上，希望這是有道理的。我不明白的是爲什麼「金額」文本字段不起作用。我嘗試了一百萬種不同的方式，但無法使其工作。在這種情況下，我得到的錯誤是「未定義的方法`金額'爲＃」

我在這裏丟失了什麼關鍵連接？謝謝。

來源

2011-10-26 SenorPuerco

乍一看似乎你應該只需更換：

 <% fields_for prefix, recipe_ingredient do |ri_form| %>

有：

 <%= fields_for prefix, recipe_ingredient do |ri_form| %>

來源

2011-10-27 07:41:16 apneadiving

感謝您抽空看看，但似乎這樣讓事情變得更糟。我現在有一個編譯錯誤。編譯錯誤 /home/jchandler/rails-tests/recipes/app/views/recipes/_recipe_ingredient.html.erb:4：語法錯誤，意外'）' ... cipe_ingredient do | ri_form | ）.to_s）; @ output_buffer.concat ... ^ /home/jchandler/rails-tests/recipes/app/views/recipes/_recipe_ingredient.html.erb:12：syntax error，unexpected kENSURE，expected'）' /home/jchandler /rails-tests/recipes/app/views/recipes/_recipe_ingredient.html.erb:14：語法錯誤，意想不到的kEND，期待'）' – SenorPuerco

以及'/ views/recipes/_recipe_ingredient.html.erb'的第4行是什麼。 – apneadiving

對不起，您提出的建議修改的線路。 <％= fields_for前綴，recipe_ingredient do | ri_form | ％> – SenorPuerco

如何添加has_many：通過細節到一個表單RoR

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