通过电子邮件first_or_create，然后保存嵌套模型 [英] first_or_create by email and then save the nested model

问题描述

我有两个模型User和Submission如下:

class User < ActiveRecord::Base
  # Associations
  has_many :submissions
  accepts_nested_attributes_for :submissions

  # Setup accessible (or protected) attributes for your model
  attr_accessible :email, :name, :role, :submission_ids, :quotation_ids, :submissions_attributes

  validates :email, :presence => {:message => "Please enter a valid email address" }
  validates :email, :uniqueness => { :case_sensitive => false }
end

class Submission < ActiveRecord::Base
  belongs_to :user
  attr_accessible :due_date, :text, :title, :word_count, :work_type, :rush, :user, :notes

  validates :work_type, :title, :text,:presence => true
  validates :text, :length => { :minimum => 250 }
  validates :word_count, :numericality => { :only_integer => true }
end

我有一个收集这两个模型所需数据的表格.用户控制器:

I have a form which collects the data required by these two models. Users controller:

def index
  @user = User.new
  @user.submissions.build
end

def create
  @user = User.where(:email => params[:user][:email]).first_or_create(params[:user])

  if @user
    redirect_to :root
  else
    render 'pages/index'
  end
end

我要做的是首先通过提交的电子邮件检查用户是否已存在于系统中.如果是这样，那么我想为该用户创建一个提交.否则，将同时创建用户和提交.

What I want to do is first check if the user already exists in the system by the email submitted. If so then I want to create a submission for that user. Otherwise create the user and submission at the same time.

我对如何使用first_or_create方法执行此操作感到困惑.

I'm confused on how to do this with the first_or_create method.

任何帮助表示赞赏.

推荐答案

first_or_create 接受阻止.因此，您可以按照以下步骤进行操作:

first_or_create accepts a block. So you could do it as follows:

@user = User.where(:email => params[:user][:email]).first_or_create do |user|
  # This block is called with a new user object with only :email set
  # Customize this object to your will
  user.attributes = params[:user]
  # After this, first_or_create will call user.create, so you don't have to
end

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