尝试使用Cocoon gem为食谱应用程序创建嵌套表单,但不允许我保存新食谱,尽管我已经添加了成分名称和配方步骤。
我在localhost中不断收到以下错误:
2通过保存
防止此配方
- 配料食谱必须存在
- 方向食谱必须存在
我按照教程,阅读了Cocoon文档并在Google和SO上研究了这个问题,但仍然无法找到它。我一直试图解决这个问题几天。非常感谢一些帮助。
模型
class Recipe < ActiveRecord::Base
belongs_to :user
has_many :ingredients
has_many :directions
accepts_nested_attributes_for :ingredients,
reject_if: proc { |attributes| attributes['name'].blank? },
allow_destroy: true
accepts_nested_attributes_for :directions,
reject_if: proc { |attributes| attributes['step'].blank? },
allow_destroy: true
validates :title, :description, :image, presence: true
has_attached_file :image, styles: { :medium => "400x400#" }
validates_attachment_content_type :image, content_type: /\Aimage\/.*\Z/
end
视图/食谱/ _form
<%= simple_form_for @recipe do |f| %>
<% if @recipe.errors.any? %>
<div id="error">
<p><%= @recipe.errors.count %> Prevented this recipe from saving</p>
<ul>
<% @recipe.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="panel-body">
<%= f.input :title %>
<%= f.input :description %>
<%= f.input :image %>
</div>
<div class="row">
<div class="col-md-6">
<h3>Ingredients</h3>
<div id="ingredients">
<%= f.simple_fields_for :ingredients do |ingredient| %>
<%= render 'ingredient_fields', f: ingredient %>
<% end %>
<div class="links">
<%= link_to_add_association 'Add Ingredient', f, :ingredients, partial: 'ingredient_fields', class: "btn btn-default add-button" %>
</div>
</div>
</div>
<div class="col-md-6">
<h3>Directions</h3>
<div id="directions">
<%= f.simple_fields_for :directions do |direction| %>
<%= render 'direction_fields', f: direction %>
<% end %>
<div class="links">
<%= link_to_add_association 'Add Step', f, :directions, partial: 'direction_fields', class: "btn btn-default add-button" %>
</div>
</div>
</div>
</div>
<div>
<%= f.button :submit, class: "btn btn-primary" %>
</div>
视图/食谱/ _ingredient_fields
<div class="form-inline clearfix">
<div class="nested-fields">
<%= f.input :name, class: "form-control" %>
<%= link_to_remove_association 'Remove', f, class: "btn btn-default" %>
</div>
</div>
视图/食谱/ _direction_fields
<div class="form-inline clearfix">
<div class="nested-fields">
<%= f.input :step, class: "form-control" %>
<%= link_to_remove_association 'Remove Step', f, class: "btn btn-default" %>
</div>
</div>
控制器
class RecipesController < ApplicationController
before_action :find_recipe, only: [:show, :edit, :update, :destroy]
before_action :authenticate_user!, except: [:index, :show]
def index
@recipe = Recipe.all.order("created_at DESC")
end
def show
end
def new
@recipe = current_user.recipes.build
end
def create
@recipe = current_user.recipes.build(recipe_params)
if @recipe.save
redirect_to @recipe, notice: "Successfully created new recipe"
else
render 'new'
end
end
def edit
end
def update
if @recipe.update(recipe_params)
redirect_to @recipe
else
render 'edit'
end
end
def destroy
@recipe.destroy
redirect_to root_path, notice: "Successfully deleted recipe"
end
private
def recipe_params
params.require(:recipe).permit(:title, :description, :image, ingredients_attributes: [:id, :name, :_destroy], directions_attributes: [:id, :step, :_destroy])
end
def find_recipe
@recipe = Recipe.find(params[:id])
end
end
如果它有助于调试,那么这是指向存储库的链接:https://github.com/rchrdchn/rails-projects/tree/master/recipe_box
答案 0 :(得分:1)
当您创建新配方时,您没有配方对象,因为它位于服务器内存中。但是当你更新它时,配方对象会被保留。
这就是为什么你必须存在配方食谱并且方向配方必须存在错误。
要解决此问题,您必须在关联中添加inverse_of。
class Recipe
has_many :ingredients, inverse_of: :recipe
has_many :directions, inverse_of: :recipe
class Ingredient
belongs_to :recipe, inverse_of: :ingredients
class Direction
belongs_to :recipe, inverse_of: :directions