ruby-on-rails - accepts_nested_attributes 带有 2 个嵌套表

Question

我是 Ruby on Rails 的新手，我正在创建简单的网站。我发现 Rails 3 使用 attr_accessible 而 Rails 4 使用 strong parameters。我目前正在使用 Rails 4。我不太确定如何设置 accepts_nested_attributes_for。

这是我的

用户模型:

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :rememberable, :validatable

  has_many :expense_pictures 
  has_many :income_pictures

  accepts_nested_attributes_for: ExpensePicture ?
  accepts_nested_attributes_for: IncomePicture ?
end

费用图片模型:

class ExpensePicture < ActiveRecord::Base
  belongs_to :user
  mount_uploader :image, ImageUploader
end

费用文本模型:

class ExpenseText < ActiveRecord::Base
  belongs_to :expense_pictures
end

IncomePicture 模型:

class IncomePicture < ActiveRecord::Base
  belongs_to :user
  mount_uploader :image, ImageUploader
end

IncomeText 模型:

class IncomeText < ActiveRecord::Base
  belongs_to :income_pictures
end

我的用户 Controller

class UserController < ApplicationController

  def create
    User.create(user_params)
    accepts_nested_attributes_for :IncomePicture ?
    accepts_nested_attributes_for :ExpensePicture ?
  end

  private

    def user_params
      # required input for params
      # permit - returns a version of the params hash with ony the permitted attributes
      params.require(:user).permit(:name, :email, :password, :password_confirmation, ...not sure...)
    end

结束

Answer 1

将 accepts_nested_attributes_for 用于has_many relation 与您的模型，您的User 模型应该如下所示

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :rememberable, :validatable

  has_many :expense_pictures 
  has_many :income_pictures

  accepts_nested_attributes_for :expense_pictures 
  accepts_nested_attributes_for :income_pictures
end

用户 Controller 的 new 和 create 方法应该如下所示

def new
@user = User.new
@user.expense_pictures.build
@user.income_pictures.build
end

def create
@user = User.new(user_params)
 if @user.save
 redirect_to @user
 else 
 render 'new'
 end
end

你的 user_params 方法应该看起来像这样

def user_params
   params.require(:user).permit(:name, :email, :password, :password_confirmation, expense_pictures_attributes: [:your_attr1,:your_attr2,..],income_pictures_attributes: [:your_attr1,:your_attr2,..])
end

如果您需要有关此的更多信息，请随时询问。