Rails has_many：通过，复选框不工作的形式

Question

我一直在这里约5个小时，并已尝试过几乎所有。我是一名具有有限导轨体验的前端开发人员，所以我可以100％折扣。

这里是我的模型：

class Apartment < ActiveRecord::Base 
    validates :name, :amenities, presence: true 

    has_many :apartment_amenities 
    has_many :amenities, through: :apartment_amenities 

    accepts_nested_attributes_for :amenities 
end 

class Amenity < ActiveRecord::Base 
    validates :name, presence: true 

    has_many :apartment_amenities 
    has_many :apartments, through: :apartment_amenities 
end 

class ApartmentAmenity < ActiveRecord::Base 

    belongs_to :apartment 
    belongs_to :amenity 

end 

模式：

create_table "amenities", force: :cascade do |t| 
    t.string "name" 
    t.datetime "created_at", null: false 
    t.datetime "updated_at", null: false 
    end 

    create_table "apartment_amenities", force: :cascade do |t| 
    t.integer "apartment_id" 
    t.integer "amenity_id" 
    t.datetime "created_at", null: false 
    t.datetime "updated_at", null: false 
    end 

    add_index "apartment_amenities", ["amenity_id"], name: "index_apartment_amenities_on_amenity_id", using: :btree 
    add_index "apartment_amenities", ["apartment_id"], name: "index_apartment_amenities_on_apartment_id", using: :btree 

    create_table "apartments", force: :cascade do |t| 
    t.string "name" 
    t.string "address" 
    t.string "website" 
    t.datetime "created_at", null: false 
    t.datetime "updated_at", null: false 
    end 

公寓控制器：

class Admin::ApartmentsController < AdminController 
    before_action :set_apartment, only: [:edit, :update, :destroy] 

    def new 
    @apartment = Apartment.new 
    end 

    def create 
    @apartment = Apartment.new(apartment_params) 

    respond_to do |format| 
     if @apartment.save 
     format.html { redirect_to apartments_path, notice: 'Apartment was successfully created.' } 
     format.json { render :show, status: :created, location: @apartment } 
     else 
     format.html { render :new } 
     format.json { render json: @apartment.errors, status: :unprocessable_entity } 
     end 
    end 
    end 

    private 
    def set_apartment 
     @apartment = Apartment.find(params[:id]) 
    end 

    def apartment_params 
     params.require(:apartment).permit(:name, :address, :website, amenities_attributes: [:id]) 
    end 
end 

和最后但并非最不重要的新公寓形式

<%= form_for([:admin, @apartment]) do |f| %> 
    <div class="field"> 
    <%= f.label :name %><br> 
    <%= f.text_field :name %> 
    </div> 

    <div class="field"> 
    <%= f.collection_check_boxes(:amenities, Amenity.all, :id, :name) %> 
    </div> 

    <div class="actions"> 
    <%= f.submit %> 
    </div> 
<% end %> 

当我将页面加载并保存公寓时，一切看起来都很正常，但这些设施实际上并未得到保存。谢谢参观。

Answer 1

我认为你需要允许名称amenities_attributes如下：

def apartment_params 
    params.require(:apartment).permit(:name, :address, :website, amenities_attributes: [:id, :name]) 
end 

Answer 2

它，因为你的表单字段不匹配你的坚强PARAMS。看看你的表单的源代码。我怀疑你会发现，在n复选框看起来像

apartment[amenities] 

但你的坚强PARAMS有amenities_attributes作为嵌套哈希值。查看日志中的参数散列，您将看到表单数据是如何格式化的。您需要更改表格以使用fields_for或更改强参数

params.require(:apartment).permit(:name, :address, :website, amenities: [])