Rails 4 个嵌套属性 simple_fields_for 一个保存到数据库，一个不保存到数据库

Question

研究：[Rails 4 个具有 fields_for 的嵌套属性不保存到数据库] [Rails 4 - 具有 Cocoon 的嵌套属性 gem][Rails 4.1 Nested Attributes and Fields For Getting Unpermitted Parameters and Not Saving]2

我的具体问题是：

我有两个嵌套表单：Ingredients 和 Directions

成分保存但说明不保存。它不会抛出错误，日志也没有关于是否存在问题的线索。

首先，让我们解决最常见的问题：强参数的属性参数命名不正确。我的是正确的复数。

class RecipesController < ApplicationController
def recipe_params
        params.require(:recipe).permit(:title, :image, directions_attributes: [:id, :name, :_destroy], ingredients_attributes: [:id, :name, :_destroy])
    end

我的模型也设置正确

class Recipe < ActiveRecord::Base
    has_many :ingredients
    has_many :directions
    belongs_to :user
    accepts_nested_attributes_for :ingredients, reject_if: :all_blank, allow_destroy: true
    accepts_nested_attributes_for :directions, reject_if: :all_blank, allow_destroy: true
    validates :title, presence: true
    mount_uploader :image, ImageUploader
end

#_form.html.haml
= simple_form_for @recipe, html: { multipart: true } do |f|
    - if @recipe.errors.any?
        #errors
            %p
                = @recipe.error.count
                Prevented this recipe from saving
            %ul
                %li= msg
    .panel-body
        = f.input :title, label: "Name", input_html: { class: 'form-control' }
        = f.input :image, label: "Picture",input_html: { class: 'form-control' }
        .row
            .col-md-6
                %h3 Ingredients
                #ingredients
                    = f.simple_fields_for :ingredients do |ingredient|
                        = render 'ingredient_fields', f: ingredient
                    .links
                        = link_to_add_association 'Add Ingredient', f, :ingredients, class: "btn btn-default add-button"

            .col-md-6
                %h3 Directions
                #directions
                    = f.simple_fields_for :directions do |direction|
                        = render 'direction_fields', f: direction
                    .links
                        = link_to_add_association 'Add Step', f, :directions, class: "btn btn-default add-button"

    = f.button :submit, class: "btn btn-primary"

这是我对成分和方向的偏爱

_ingredient_fields.html.haml
.form-inline.clearfix
    .nested-fields
        = f.input :name, input_html: { class: "form-input form-control"}
        = link_to_remove_association 'Remove', f, class: "form-button btn btn-default"

_direction_fields.html.haml
.form-inline.clearfix
    .nested-fields
        = f.input :name, input_html: { class: "form-input form-control"}
        = link_to_remove_association 'Remove', f, class: "form-button btn btn-default"

好的，有趣的是，我的应用程序没有抛出任何错误。名称、图像和成分会保存，但说明不会。

这是日志

于 2016 年 2 月 12 日开始 POST ::1 的“/食谱”19:00:07 -0800 RecipesController 处理#create as HTML 参数：{"utf8"=>"✓", "authenticity_token"=>"YEXiv10mHkfdLPRFGHFGNJX2szJQVXK7gezeakEFbe+57afx6Ih1UjRS6tJNftDLsMI5NS1W84pf2sRhQi0J8g==", "recipe"=>{"title"=>"Honey Apple Chicken", "image"=>#, @original_filename="Honey-Mustard-Chicken-and-Apples.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"recipe[image]\"; filename= \"Honey-Mustard-Chicken-and-Apples.jpg\"\r\nContent-Type: image/jpeg\r\n">, "ingredients_attributes"=>{"1455332308170"=>{"name"=>"Chicken Thighs", "_destroy"=>"false"}, "1455332308175"=>{"name"=>"Honey", "_destroy"=>"false"}}, "directions_attributes"=>{"1455332325877"=>{"step"=>"Brown Chicken with skin on.", "_destroy"=>"false"}, "1455332325880"=>{"step"=>"Add apples", "_destroy"=>"false"}}}, "commit"=>"Create Recipe"} 用户负载 (0.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = ?按 "users"."id" 升序限制 1 [["id", 1]] 不允许的参数：步骤不允许的参数：step (0.1ms) 开始交易配方存在（0.2 毫秒）SELECT 1 作为一个 FROM "recipes" WHERE "recipes"."image" = ?限制 1 [["image", "1455332407-84040-0233/Honey-Mustard-Chicken-and-Apples.jpg"]] SQL（0.4 毫秒）插入 "recipes"（"title"、"image"、"user_id"、"created_at"、"updated_at"）值（？ , ?, ?, ?, ?) [["title", "Honey Apple Chicken"], ["image", "1455332407-84040-0233/Honey-Mustard-Chicken-and-Apples.jpg"], ["user_id", 1], ["created_at", "2016-02-13 03:00:07.756946"], ["updated_at", "2016-02-13 03:00:07.756946"]] SQL（0.2 毫秒）插入 "ingredients"（"name"、"recipe_id"、"created_at"、"updated_at"）值（？、？、？、？ ) [["name", "Chicken Thighs"], ["recipe_id", 1], ["created_at", "2016-02-13 03:00:07.758440"], [ "updated_at", "2016-02-13 03:00:07.758440"]] SQL（0.1 毫秒）插入 "ingredients"（"name"、"recipe_id"、"created_at"、"updated_at"）值（？、？、？、？ ) [["name", "Honey"], ["recipe_id", 1], ["created_at", "2016-02-13 03:00:07.759655"], [ "updated_at", "2016-02-13 03:00:07.759655"]] (2.5ms) 提交事务重定向至 http://localhost:3000/recipes/1 完成 302 在 1499 毫秒内找到（ActiveRecord：3.5 毫秒）

于 2016 年 2 月 12 日开始为 ::1 获取“/recipes/1”19:00:09-0800 RecipesController 处理#show as HTML 参数：{"id"=>"1"} 配方加载 (0.3ms) SELECT "recipes".* FROM "recipes" WHERE "recipes"."id" = ?限制 1 [["id", 1]] 用户负载 (0.2ms) SELECT "users".* FROM "users" WHERE "users"."id" = ?限制 1 [["id", 1]] 成分负载 (0.3ms) SELECT "ingredients".* FROM "ingredients" WHERE "ingredients"."recipe_id" = ? [["recipe_id", 1]] 方向负载 (0.1ms) SELECT "directions".* FROM "directions" WHERE "directions"."recipe_id" = ? [["recipe_id", 1]] 用户负载 (0.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = ?按 "users"."id" 升序限制 1 [["id", 1]] 在 layouts/application（9.2 毫秒）内呈现 recipes/show.html.haml 在 47 毫秒内完成 200 OK（视图：41.2 毫秒 | ActiveRecord：1.0 毫秒）

我不明白 Karl 对他自己的问题的回答：Rails 4.1 Nested Attributes and Fields For Getting Unpermitted Parameters and Not Saving 如果你能看到任何东西，你就是 Macgyver！

Answer 1

您可以更改：

params.require(:recipe).permit(:title, :image, directions_attributes: [:id, :name, :_destroy], ingredients_attributes: [:id, :name, :_destroy])

为

params.require(:recipe).permit(:title, :image, directions_attributes: [:id, :name, :step, :_destroy], ingredients_attributes: [:id, :name, :_destroy])

您尝试在不允许的情况下发送 "step"，如果您在方向模型中对 setp 列进行了 not_blank 验证，则不会保存。

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