Question

我使用设计用于我们的用户管理。

模特：

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable
  attr_accessible :email, :password, :password_confirmation, :remember_me, :name

  has_many :carts   

end

class Cart < ActiveRecord::Base
  has_many :line_items, dependent: :destroy
  accepts_nested_attributes_for :line_items
  belongs_to :user

end

cart_controller：

def create
    @cart = current_user.cart.new(cart_params)

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

private

    def cart_params
      params[:cart]
    end

模块：

module CurrentCart
  extend ActiveSupport::Concern

  private

    def set_cart 
      @cart = Cart.find(session[:cart_id])
    rescue ActiveRecord::RecordNotFound
      @cart = Cart.create
      session[:cart_id] = @cart.id 
    end
end

创建购物车时（添加列表项时）我想将其存储在购物车表（user_id）中的user.id中。所以我想使用像这样的current_user方法

  @cart = current_user.cart.new(cart_params)

使用商品创建购物车，但购物车表中的user_id仍为空。我究竟做错了什么？

thanks..remco

Answer 1

尝试

@cart = current_user.carts.build(cart_params)

Answer 2

Matt Gibson指出（这就是我如何从协会创建新购物车）：

@cart = current_user.carts.build(cart_params)

但是，由于Rails 4的强大参数，我认为它没有达到预期效果。为此你可能想要改变这个：

private

    def cart_params
      params[:cart]
    end

为：

private

    def cart_params
      params.require(:cart).permit(:name, :state) # at :name, :state use attributes which you're getting from the form for cart!
    end

更改

def set_cart 
  @cart = Cart.find(session[:cart_id])
rescue ActiveRecord::RecordNotFound
  @cart = Cart.create
  session[:cart_id] = @cart.id 
end

为：

def set_cart 
  @cart = Cart.find(session[:cart_id])
rescue ActiveRecord::RecordNotFound
  @cart = current_user.carts.create
  session[:cart_id] = @cart.id # since you're setting this ID in session which you use for update later!
end

Answer 3

应该是

@cart = current_user.carts.new(cart_params)

由于has_many关系，您必须使用carts而不是购物车

在相关表中存储current_user（设计）？

3 个答案: