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我正在使用帶有Google App Engine的Ruby on Rails，即本教程：https://cloud.google.com/ruby/getting-started/hello-world。我正在使用Google Datastore而不是傳統的數據庫。對於生產，我可以輕鬆連接到我的項目的數據存儲，但使用Google數據存儲模擬器的開發模式證明了一個問題。我能夠安裝數據存儲模擬器並使用提供的谷歌教程（https://cloud.google.com/datastore/docs/tools/datastore-emulator）啓動並運行它。無法在Ruby on Rails項目中使用Google數據存儲模擬器
我運行數據存儲模擬器，然後運行gcloud beta emulators datastore env-init並確保這些環境變量位於我的.bashrc文件中（並且源代碼爲.bashrc文件）。
我的環境變量是這個樣子：
export DATASTORE_DATASET=my-app
export DATASTORE_HOST=http://localhost:8473
export DATASTORE_EMULATOR_HOST=localhost:8473
export DATASTORE_PROJECT_ID=my-app
然後我嘗試做從內軌以下內容：
require 'gcloud'
gcloud = Gcloud.new('my-app')
dataset = gcloud.datastore
這將導致以下錯誤從「gcloud」寶石：
RuntimeError: Could not load the default credentials. Browse to
https://developers.google.com/accounts/docs/application-default-credentials
for more information
from /home/sam/.rvm/gems/ruby-2.2.3/gems/googleauth-0.5.1/lib/googleauth.rb:119:in `get_application_default'
from /home/sam/.rvm/gems/ruby-2.2.3/gems/gcloud-0.7.2/lib/gcloud/credentials.rb:83:in `default'
from /home/sam/.rvm/gems/ruby-2.2.3/gems/gcloud-0.7.2/lib/gcloud/datastore.rb:62:in `datastore'
from /home/sam/.rvm/gems/ruby-2.2.3/gems/gcloud-0.7.2/lib/gcloud.rb:106:in `datastore'
from (irb):3
from /home/sam/.rvm/gems/ruby-2.2.3/gems/railties-4.2.6/lib/rails/commands/console.rb:110:in `start'
from /home/sam/.rvm/gems/ruby-2.2.3/gems/railties-4.2.6/lib/rails/commands/console.rb:9:in `start'
from /home/sam/.rvm/gems/ruby-2.2.3/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:68:in `console'
from /home/sam/.rvm/gems/ruby-2.2.3/gems/railties-4.2.6/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from /home/sam/.rvm/gems/ruby-2.2.3/gems/railties-4.2.6/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:18:in `require'
from bin/rails:18:in `<main>'
我的印象是，如果使用數據，我不需要密鑰文件撕毀模擬器。如果我確實需要密鑰文件，我該如何創建一個能讓我連接到本地數據存儲模擬器的密鑰文件？數據存儲模擬器文檔根本沒有提到這一點，並且似乎表明，僅僅使用環境變量就足以讓本地客戶端自動連接。
請指教！