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。

这就是我所拥有的

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

ExpensePicture模型：

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

ExpenseText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

我的用户控制器

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

端

Answer 1

对您的模型使用accepts_nested_attributes_for has_many relation，您的User模型应如下所示

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

您的new和create usercontroller方法应如下所示

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

您的user_params方法看起来应该是这样的

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

如果您想了解更多相关信息，请随时询问。

accepts_nested_attributes有2个嵌套表

1 个答案: