RuntimeError: Could not load the default credentials - ruby-on-rails

Question

i've installed google/cloud/translate in my project, the version in the Gemfile.lock is:
google-cloud-translate (2.1.0)
With the below code:
require "google/cloud/translate"
project_id = "<Project ID>" # from my Google Cloud Platform
translate = Google::Cloud::Translate.new version: :v2, project_id: project_id
That is what the documentation says and also what this answer related suggest (please note that i'm using v2 instead of v3)
RuntimeError: Could not load the default credentials. Browse to
https://developers.google.com/accounts/docs/application-default-credentials for more information
This part returns true:
require "google/cloud/translate"
Update
I already followed all the steps in:
https://cloud.google.com/docs/authentication/production
Created a service account, a credential key and set the env variable (on Windows), then I tried testing the credential configuration with the google/cloud/storage example and it's worked fine, but when I tried with: google/cloud/translate gem with
translate = Google::Cloud::Translate.new version: :v2, project_id: project_id
I still got the same error
What can be the error?
Thanks in advance for any help.

Answer 1

Hi for doing this you will need to have your .json file with all the keys of your google service account, once that you have that file in the same path of your project you could do something like the following code:
module GoogleTranslator
require "google/cloud/translate"
ENV["GOOGLE_APPLICATION_CREDENTIALS"] = "yourfile.json"
class Translate
attr_reader :project_id, :location_id, :word, :target_language
def initialize(project_id, location_id, word, target_language)
#project_id = project_id
#location_id = location_id
#word = word
#target_language = target_language
end
def translate
client = Google::Cloud::Translate.translation_service
parent = client.location_path project: project_id, location: location_id
response = client.translate_text(parent: parent, contents: word.words.to_a, target_language_code: target_language)
translate_content(response)
end
def translate_content(response)
word.translation(response)
end
end
end
class Word
attr_reader :words
def initialize(words)
#words = words
end
def translation(words)
words.translations.each do |word|
puts word.translated_text
end
end
end
module GoogleTranslatorWrapper
def self.translate(project_id:, location_id:, word:, target_language:)
GoogleTranslator::Translate.new(project_id, location_id, word, target_language)
end
end
GoogleTranslatorWrapper.translate(project_id: "your_project_id_on_google", location_id: "us-central1", word: Word.new(["your example word"]), target_language: "es-mx").translate
Hope this can be clear :)...!

Answer 2

Create a service account:
gcloud iam service-accounts create rubyruby --description "rubyruby" --display-name "rubyruby"
Get the service account name:
gcloud iam service-accounts list
Create the credential key file for your service account:
gcloud iam service-accounts keys create key.json --iam-account rubyruby#your-project.iam.gserviceaccount.com
Set the env variable:
export GOOGLE_APPLICATION_CREDENTIALS=key.json
Enable the translate API
Install the library:
gem install google-cloud-translate
Edit the ruby.rb script
# project_id = "Your Google Cloud project ID"
# text = "The text you would like to detect the language of"
require "google/cloud/translate"
text = 'I am home'
translate = Google::Cloud::Translate.new version: :v2, project_id: project_id
detection = translate.detect text
puts "'#{text}' detected as language: #{detection.language}"
puts "Confidence: #{detection.confidence}"
Run the script:
ruby ruby.rb
Output:
'I am home' detected as language: en
Confidence: 1