ruby-on-rails - Rails 5 after_create 回调创建 has_many ：通过连接表

Question

我有Account和我的模型Page有has_many :through关联的Campaigns模型。我要做的是在使用create_after回调创建新页面时创建连接表。

我也和模特有has_many :through联系。AccountUser

我得到的当前错误是Account must exist. 我想要做的是抓住account_id用户logged_in，但很难过。

我在下面包含了我的所有模型，因此您可以了解正在发生的事情。用户创建一个帐户，获取激活电子邮件，然后登录。此时，创建的所有内容都附加到该帐户，而不是用户 - 在这种情况下，我想创建一个页面并让它通过该帐户创建一个连接表活动。

帐号.rb

class Account < ActiveRecord::Base
  after_create :set_membership
  belongs_to :owner, class_name: 'User'
  accepts_nested_attributes_for :owner

  has_many :memberships
  has_many :users, through: :memberships

  has_many :campaigns
  has_many :pages, through: :campaigns


  # Create Membership
  def set_membership
    user_id = self.owner_id
    Membership.create!(user_id: user_id, account_id: id)
  end
end

用户.rb

class User < ApplicationRecord
  has_many :memberships
  has_many :accounts, through: :memberships
  #accepts_nested_attributes_for :accounts

  attr_accessor :remember_token, :activation_token, :reset_token
  before_save :downcase_email
  before_create :create_activation_digest
  before_save {self.email = email.downcase}
  validates :name, presence: true, length: {maximum: 50}
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
  validates :email, presence: true, length: {maximum: 255},
            format: {with: VALID_EMAIL_REGEX},
            uniqueness: {case_sensitive: false}
  has_secure_password
  validates :password, presence: true, length: {minimum: 6}, allow_nil: true
  validates :password, presence: true, length: {minimum: 6}
  after_create :send_activation_email

  # Non-Admin User Roles
  enum role: [:standard]
  after_initialize :set_default_role, if: :new_record?

  def set_default_role
    self.role ||= :standard
  end

  # Returns the hash digest of the given string.
  def User.digest(string)
    cost = ActiveModel::SecurePassword.min_cost ? BCrypt::Engine::MIN_COST :
               BCrypt::Engine.cost
    BCrypt::Password.create(string, cost: cost)
  end

  # Returns a random token.
  def User.new_token
    SecureRandom.urlsafe_base64
  end

  # Remembers a user in the database for use in persistent sessions.
  def remember
    self.remember_token = User.new_token
    update_attribute(:remember_digest, User.digest(remember_token))
  end

  # Returns true if the given token matches the digest.
  def authenticated?(attribute, token)
    digest = send("#{attribute}_digest")
    return false if digest.nil?
    BCrypt::Password.new(digest).is_password?(token)
  end

  # Forgets a user.
  def forget
    update_attribute(:remember_digest, nil)
  end

  # Activates an account.
  def activate
    # update_columns(activated: FILL_IN, activated_at: FILL_IN)
    update_attribute(:activated, true)
    update_attribute(:activated_at, Time.zone.now)
  end

  # Sends activation email.
  def send_activation_email
    UserMailer.account_activation(self).deliver_now
  end

  # Sets the password reset attributes.
  def create_reset_digest
    self.reset_token = User.new_token
    update_attribute(:reset_digest, User.digest(reset_token))
    update_attribute(:reset_sent_at, Time.zone.now)
    # update_columns(reset_digest:  FILL_IN, reset_sent_at: FILL_IN)
  end

  # Sends password reset email.
  def send_password_reset_email
    UserMailer.password_reset(self).deliver_now
  end

  # Returns true if a password reset has expired.
  def password_reset_expired?
    reset_sent_at < 2.hours.ago
  end

  private

  # Converts email to all lower-case.
  def downcase_email
    self.email = email.downcase
  end

  # Creates and assigns the activation token and digest.
  def create_activation_digest
    self.activation_token = User.new_token
    self.activation_digest = User.digest(activation_token)
  end
end

页面.rb

class Page < ApplicationRecord
  after_create :set_campaign
  belongs_to :account

  has_many :campaigns
  has_many :accounts, through: :campaigns

  # Create Campaign
  def set_campaign
    Campaign.create!(account_id: account_id, page_id: id)
  end
end

活动.rb

class Campaign < ApplicationRecord
  belongs_to :account
  belongs_to :page
end

标签： ruby-on-railsruby-on-rails-5

Answer 1

在 railsafter_create回调不会关闭默认数据库策略中的事务。因此，当您调用after_create它时，实际上数据库中没有记录。你的情况你应该尝试：

after_commit :set_membership, on: :create

或者提供记录而不是 id：

def set_membership
  Membership.create!(user_id: owner_id, account: self)
end