Mongoid::Errors::DocumentNotFound raise_not_found_error

Question

* 在底部更新 *

在寻找不存在的用户时，我得到：

Mongoid::Errors::DocumentNotFound in UsersController#show

问题： 未找到 ID 为 22 的类用户的文档。摘要：何时 使用 id 或 id 数组调用 User.find，每个参数必须 匹配数据库中的文档，否则将引发此错误。这 搜索的 id(s): 22 ...（总共 1 个）和以下 id 未找到：22. 解决方法：搜索数据库中的 id 或 将 Mongoid.raise_not_found_error 配置选项设置为 false， 这将导致返回 nil 而不是引发此错误 搜索单个 id 时，或仅搜索匹配的文档时 搜索倍数。

但是我将 raise_not_found_error 设置为 false

mongoid.yml

development:
  adapter: 'mongoid'
  # Configure available database sessions. (required)
  sessions:
    # Defines the default session. (required)
    default:
      # Defines the name of the default database that Mongoid can connect to.
      # (required).
      database: blog_development
      # Provides the hosts the default session can connect to. Must be an array
      # of host:port pairs. (required)
      hosts:
        - localhost:27017
      options:
          allow_dynamic_fields: false
          identity_map_enabled: true
          include_root_in_json: true
          include_type_for_serialization: true
          # Note this can also be true if you want to preload everything, but this is
          # almost never necessary. Most of the time set this to false.
          preload_models:
            - Canvas
            - Browser
            - Firefox
          scope_overwrite_exception: true
          raise_not_found_error: false
          skip_version_check: false
          use_activesupport_time_zone: false
          use_utc: true
  # Configure Mongoid specific options. (optional)
  options:
    # Enable the identity map, needed for eager loading. (default: false)
    # identity_map_enabled: false

    # Includes the root model name in json serialization. (default: false)
    # include_root_in_json: false

    # Include the _type field in serializaion. (default: false)
    # include_type_for_serialization: false

    # Preload all models in development, needed when models use
    # inheritance. (default: false)
    # preload_models: false

    # Protect id and type from mass assignment. (default: true)
    # protect_sensitive_fields: true

    # Raise an error when performing a #find and the document is not found.
    # (default: true)
    raise_not_found_error: false

    # Raise an error when defining a scope with the same name as an
    # existing method. (default: false)
    scope_overwrite_exception: false

    # Skip the database version check, used when connecting to a db without
    # admin access. (default: false)
    # skip_version_check: false

    # Use Active Support's time zone in conversions. (default: true)
    # use_activesupport_time_zone: true

    # Ensure all times are UTC in the app side. (default: false)
    # use_utc: false
test:
  sessions:
    default:
      database: blog_test
      hosts:
        - localhost:27017
      options:
        consistency: :strong
        # In the test environment we lower the retries and retry interval to
        # low amounts for fast failures.
        max_retries: 1
        retry_interval: 0

控制器

  # GET /users/1
  # GET /users/1.json
  def show

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

    render json: @user
  end

* 更新 ** 通过执行以下操作修复了一个空响应（不是 json 格式）：

  def show

    @user = User.find(params[:id])
    if @user.nil?
      @user = []
    end

    render json: @user
  end

Answer 1

你的yml结构不对

必须是 -

development:
  sessions:
    options:
      #raise_not_found_error has to be not here but see below
  options: #strictly 2 spaces before
    raise_not_found_error: false #strictly 4 spaces before not 6

所以，raise_not_found_error 参数必须是 development>options 的子级，而不是 development>sessions>options

Answer 2

对我来说，即使正确的缩进也不起作用，所做的是在 config/initializers/ 中创建一个名为 mongoid.rb 的初始化文件并将其放入其中

Mongoid.raise_not_found_error = false

Answer 3

为了节省几分钟，如果您仍然遇到问题并且确定您的 mongoid.yml 配置正确，请尝试停止 spring 服务器，因为它似乎做了很多缓存！

$ spring stop