编辑1：

Question

我创建了一个迁移，该迁移向我们的表/模型（cloud_photo_url）中添加了新列。但是，当我尝试将其渲染时，API不会生成该值。我还注意到其他一些属性也丢失了。

我不知道如何获取json输出以包含来自cloud_photo_url的值。需要明确的是，它被保留在数据库中，但是由于任何原因，API均未返回该值。如果我更改或更新其他值（例如first_name或last_name），这些更改将反映在json响应中。

db /模式：

     Column      |            Type             |                       Modifiers
-----------------+-----------------------------+-------------------------------------------------------
 id              | uuid                        | not null default shared_extensions.uuid_generate_v4()
 last_seen_at    | timestamp without time zone |
 auth_token      | character varying           |
 created_at      | timestamp without time zone | not null
 updated_at      | timestamp without time zone | not null
 first_name      | character varying           |
 last_name       | character varying           |
 email           | character varying           |
 birthday        | date                        |
 provider_id     | character varying           |
 password_digest | character varying           |
 gender          | integer                     | default 0
 verified        | boolean                     | default false
 photo           | character varying           |
 provider        | integer                     | default 0
 cloud_photo_url | character varying           |

Ruby代码：

@user = User.find(params[:id])
render json: @user

api端点的

json输出：

{
    "user": {
        "id": "8c29a48e-c2c2-4374-b8e6-f9d7c6970a9a",
        "auth_token": "WH4fveVNa1vANgD6LKbVJPL2",
        "provider": "guest",
        "provider_id": "111959522860722",
        "first_name": "miguel",
        "last_name": "martin",
        "email": "a@b.com",
        "verified": false,
        "gender": "unknown",
        "birthday": null,
        "photo": null,
        "pois": []
    }
}

编辑1：

•根据注释，puts @user.to_json确实可以处理全部数据库内容。

•是的，我确定这些值将持久保存到数据库中。我也确定路线正确（如我在问题中所指出的，如果我更新显示的其他值，它们在响应中也会类似地更新）。

•我同意似乎有一些干扰render :json的问题，但是我无法弄清楚是什么。我寻找了任何.rabl文件，但未找到任何文件。

•使用render inline: @user.to_json, content_type: "application/json"使我非常接近... json只是略有畸形（封装不完美）...但是我更喜欢以“正确的方式”进行修复。

有关如何配置可能影响此路线/渲染/模型/控制器的任何其他帮助将很有帮助。

编辑2：

有人问我的模型，这里是：

class User < ApplicationRecord
  attr_accessor :updating_password

  mount_uploader :photo, UserPhotoUploader

  has_secure_password validations: false
  has_secure_token :auth_token

  enum gender: { unknown: 0, female: 1, male: 2 }, _prefix: true
  enum platform: { ios: 0, android: 1 }
  enum provider: { guest: 0, email: 1, facebook: 2 }, _prefix: true

  has_many :comments, dependent: :destroy
  has_many :enters, dependent: :destroy
  has_many :pois, through: :subscriptions
  has_many :subscriptions, dependent: :destroy
  has_many :devices, dependent: :destroy

  has_many :outgoing_messages, class_name: 'MessageQueue', dependent: :destroy

  has_many :user_messages, dependent: :destroy
  has_many :messages, through: :user_messages, source: :user

  validates_associated :devices

  validates :provider_id, presence: true, if: :provider_requires_id
  validates :first_name,  presence: true, unless: :provider_is_guest
  validates :last_name,   presence: true, unless: :provider_is_guest
  validates :email,
    presence: true,
    uniqueness: { case_sensitive: false },
    format: { with: REGEX_EMAIL, message: 'Invalid email address' },
    unless: :provider_is_guest
  validates :password, length: { minimum: 6, maximum: 128, message: 'must be greater than 5 characters' }, if: :setting_password?
  validates :provider_id, uniqueness: {
      scope: [:provider],
      message: 'Provider ID already exists'
  }, if: :provider_requires_id

  def gender=(g)
    g.try(:downcase!)

    gender = g.blank? ? 0 : g
    super(gender)
  end

  # IF not guest or email account then it requires a provider ID
  def provider_requires_id
    !['guest', 'email'].include?(self.provider)
  end

  def provider_is_guest
    provider_guest?
  end

  def setting_password?
    (self.provider_email? && new_record?) || updating_password
  end

  def name
    provider_guest? ? "Guest User" : "#{first_name} #{last_name}"
  end

  def send_email_verification
    UserVerificationMailer.perform_later(current_tenant, self)
  end

  def send_password_reset
    UserPasswordResetMailer.perform_later(current_tenant, self)
  end
end

Answer 1

通过使用active_model_serializers

让我们说

@user = User.find(params[:id])
render json: @user

这意味着它将直接查找UserSerializer来呈现@user对象。 UserSerializer中定义的属性将呈现为json输出。

除此active_model_serializers之外，还有一些自定义json输出的选项，例如：-

render json: @user, serializer: CustomUserSerializer, serializer_options: {}, status: 200

在custom_user_serializer.rb

中

class CustomUserSerializer < ActiveModel::Serializer
  attributes :id,
             :last_seen_at, 
             :auth_token,
             :created_at,
             :updated_at
             :...#so on
end

ActiveRecord不提供所有数据库列

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编辑2：

1 个答案: