嵌套表单不保存

Question

我是 rails 和 MVC 的新手。我正在尝试将我使用 simple-form 和 nested-form-for gems 创建的嵌套表单保存到我的数据库中。当我提交表单时，只会创建并保存 'parent' 模型。非常感谢。

'parent model':

class Diet < ApplicationRecord
    belongs_to :coach

    has_many :user_eat_diets
    has_many :user, through: :user_eat_diets
    accepts_nested_attributes_for :user_eat_diets

    has_many :diet_composes
    has_many :foods, through: :diet_composes
    accepts_nested_attributes_for :diet_composes
end

'child' 型号：

class DietCompose < ApplicationRecord
    belongs_to :diet
    belongs_to :food
end

'parent' 控制器：

class DietsController < ApplicationController
    def new
        @diet = Diet.new
        @diet.diet_composes.build
    end

    def create
        @diet = Diet.new(diet_params)
        if @diet.save
            flash[:success] = "success"
        end
    end
    def diet_params
      params.require(:diet).permit(:name, :coach_id, :diet_composes_attributes)
    end

end

'child' 控制器：

class DietComposesController < ApplicationController
    def new
        @diet_compose = Diet_compose.new
    end

    def create
        @diet_compose = Diet_compose.new(diet_compose_params)
        if @diet_compose.save
            flash[:success] = "success"
        end
    end

    def diet_compose_params
      params.require(:diet_compose).permit(:quantity, :hour, :day, :food_id, :diet_id)
    end
end

表单视图：

<%= simple_form_for @diet, :html => {:class => 'form-basic' }  do |f| %>
            <%= f.input :name %>
            <%= f.input :coach_id %>
            <%= f.nested_fields_for :diet_composes do |ff| %>
                    <%= ff.remove_nested_fields_link %>
                    <%= ff.input :hour %>
                    <%= ff.input :day %>
                    <%= ff.input :food_id %>
                    <%= ff.input :diet_id %>
                <% end %>
            <%= f.add_nested_fields_link :diet_composes %>
            <%= f.button :submit %>
        <% end %>

此外，当我执行命令时

Diet_compose.all

在 rails 控制台上我收到错误

LoadError: Unable to autoload constant Diet_compose, expected /home/tanaka/Desktop/E-xercite/app/models/diet_compose.rb to define it from (irb):8

Answer 1

您需要在此处更正多项内容。我已经添加了内联评论。

在 Diet 模型中 (diet.rb)

class Diet < ApplicationRecord
  attr_accessible :diet_composes # make the attributes accessible for mass assignment.
end

在控制器中：

class DietsController < ApplicationController
    def new
        @diet = Diet.new
        @diet.diet_composes.build
    end

    def create
        @diet = Diet.new(diet_params)
        if @diet.save
            flash[:success] = "success"
        end
    end
    def diet_params
       # add attributes of nested association to whitelist
      params.require(:diet).permit(:name, :coach_id, :diet_composes_attributes => [:hour, :day, :food_id, :diet_id])
    end

end

您实际上并不需要 DietComposesController 的操作来使 Diet 的嵌套属性正常工作。但是，更正下面的错误会给你 LoadError

class DietComposesController < ApplicationController
    def new
        @diet_compose = DietCompose.new # Model name is always CamelCase. DietCompose rather than Diet_compose
    end

    def create
        @diet_compose = DietCompose.new(diet_compose_params) # here as well
        if @diet_compose.save
            flash[:success] = "success"
        end
    end

    def diet_compose_params
      params.require(:diet_compose).permit(:quantity, :hour, :day, :food_id, :diet_id, )
    end
end

你的命令应该是DietCompose.all。甚至看看diet_model.rb的定义。它将名称声明为 DietModel。

你的观点似乎不错。我没有使用 nested_form_fields gem，所以不能 100% 确定。调试的简单规则，查看rails服务器的日志并推断:)

嵌套表单不保存

Nested form don't save

ruby-on-rails

nested-form-for

simple-form

ruby-on-rails-5.1