Ruby on rails Mongoid Model.find在规范中失败，但在应用程序中有效

下一行：

  User.find(session[:user_id])

其中

会话[：user\u id]

先前定义：

  session[:user_id] = user.id

In-spec工作正常并返回用户模型，但在real app（开发模式）中失败：

MOPED: 127.0.0.1:27017 QUERY        database=rails_api_development collection=users selector={"_id"=>{"$oid"=>BSON::ObjectId('533c3958616c641142010000')}} flags=[] limit=0 skip=0 batch_size=nil fields=nil runtime: 1.0680ms
Completed 500 Internal Server Error in 15ms

Moped::Errors::QueryFailure - The operation: #<Moped::Protocol::Query
    @length=89
@request_id=2
@response_to=0
@op_code=2004
@flags=[]
@full_collection_name="rails_api_development.users"
@skip=0
@limit=0
@selector={"_id"=>{"$oid"=>BSON::ObjectId('533c3958616c641142010000')}}
@fields=nil>
    failed with error 10068: "invalid operator: $oid"

See https://github.com/mongodb/mongo/blob/master/docs/errors.md
for details about this error.:
  moped (2.0.0.rc1) lib/moped/operation/read.rb:50:in `block in execute'
  moped (2.0.0.rc1) lib/moped/node.rb:594:in `block (2 levels) in flush'

但spec在以下方面失败：

   1) ApplicationController current_user when current_user is nil and user_id stores in session finds and returns it from db
 Failure/Error: expect(subject.send(:current_user)).to eq user
 NoMethodError:
   undefined method `[]' for BSON::ObjectId('533fae9e616c6464a4010000'):BSON::ObjectId
 # ./app/controllers/application_controller.rb:7:in `current_user'
 # ./spec/controllers/application_controller_spec.rb:22:in `block (5 levels) in <top (required)>'

---

我之前也遇到过类似的问题，问题是会话中

BSON:：ObjectId

的json表示。正如您还发现的那样，给_s打电话解决了这个问题。您需要确保会话包含字符串格式的id。因此，每当您将用户id分配给会话时，请调用

至

。尝试进行以下更改：

将

ApplicationController

中的

当前用户=

更改为：

  User.find(session[:user_id]['$oid'])

def current_user=(user)
  @current_user = user
  session[:user_id] = user.try(:id).try(:to_s)
end

将等级库更改为：

context "and user_id stores in session" do
  let(:user) { create(:user) }
  before { allow(subject).to receive(:session).and_return({ user_id: user.id.to_s }) }
  before { allow(User).to receive(:find).and_return(user) }

  it "finds and returns it from db" do
    expect(User).to receive(:find)
    expect(subject.send(:current_user)).to eq user
  end
end

---

请在{allow（User）.to receive（：find）.and_return（User）}之前发布失败的相关测试，因此没有必要，并将预期更改为

expect（User）.to receive（：find）.and_return（User）

context "and user_id stores in session" do
  let(:user) { create(:user) }
  before { allow(subject).to receive(:session).and_return({ user_id: user.id.to_s }) }
  before { allow(User).to receive(:find).and_return(user) }

  it "finds and returns it from db" do
    expect(User).to receive(:find)
    expect(subject.send(:current_user)).to eq user
  end
end