Rails:NameError(未初始化的常量 UserSerializer) [英] Rails: NameError (uninitialized constant UserSerializer)

问题描述

我目前正在使用 Rails 6.0 构建一个仅限 Rails API 的应用程序.我正在使用 fast_jsonapi 进行 JSON:API 序列化 Ruby 对象.现在我只创建了 UsersController.

I am currently building a Rails API-only application using Rails 6.0. I am using fast_jsonapi for JSON:API serialization of Ruby Objects. For now I have created only the UsersController.

我有一个具有以下属性的 user 模型:

I have a user model with the following attributes:

ActiveRecord::Schema.define(version: 2020_03_14_175719) do
 create_table "users", force: :cascade do |t|
    t.string "first_name"
    t.string "last_name"
    t.string "username"
    t.string "password_digest"
    t.string "email"
    t.string "phone"
    t.text "address"
    t.datetime "created_at", precision: 6, null: false
    t.datetime "updated_at", precision: 6, null: false
    t.index ["email"], name: "index_users_on_email", unique: true
    t.index ["username"], name: "index_users_on_username", unique: true
  end
end

我为它创建了一个 user_serializer:

class UserSerializer
  include FastJsonapi::ObjectSerializer
  attributes :first_name, :last_name, :username, :password, :email, :phone, :address
end

我还通过 rails 控制台 在数据库上创建了一个 User 并包含以下信息:

I have also created a User on the database via the rails console with the following information:

User.delete_all
user = User.create! first_name: 'Promise', last_name: 'My last name', username: 'myusername', email: '[e-mail]', password: 'mypassword', phone: '002037363', address: 'my address'
puts "Created a new user: #{user.first_name} #{user.last_name} with email - #{user.email}"

但是，当我在 rails 控制台中运行以下命令时:

However, when I run the command below in the rails console:

UserSerializer.new(User.first).serializable_hash

我收到以下错误:

NameError(未初始化的常量 UserSerializer)

NameError (uninitialized constant UserSerializer)

我尝试了一些解决方案，但似乎都没有奏效.我需要帮助.谢谢.

I have tried a few solutions, but none seems to be working. I need some help. Thanks.

推荐答案

我是这样解决的:

退出 rails 控制台，如果你还在里面:

Exit the rails console, if you're still inside it:

exit

停止 spring Rails 应用预加载器:

Stop the spring Rails application preloader:

spring stop

再次进入开发环境rails console:

rails console

再次运行命令:

UserSerializer.new(User.first).serializable_hash

它给出了这样的输出:

#<ActiveRecord::Relation [#<User id: 3, first_name: "Promise", last_name: "My last name", username: "myusername", password_digest: [FILTERED], email: "[e-mail]", phone: "002037363", address: "my address", created_at: "2020-03-14 18:36:31", updated_at: "2020-03-14 18:36:31">]>

仅此而已.

我希望这会有所帮助

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