how to Import contacts via gmail in rails? [duplicate] - ruby-on-rails

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Issues in fetching address book to fetch Gmail, Yahoo, Hotmail, Twitter and Facebook contact list in Ruby on Rails
I'm creating an app that people can add their friends to and I want to help them find them via gmail (like that facebook, twitter or foursquare do). I saw the google api for it and im pretty convinced that I need the "Portable Contacts API". My question is how do I do that in Rails?

You could use OmniContacts: https://github.com/Diego81/omnicontacts
Diego

You can take a look at:
https://github.com/glennfu/contacts
You should be able to import Yahoo, Gmail, Hotmail, AOL and Plaxo.

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In my application I want to fetch my gmail contacts.
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I wouldn't imagine how you would get the contacts from one service by using another? Not everyone in your gmail contacts is going to be on your google+ account, so how would it be possible to get them?
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It is possible, but only if you ask for the contacts scope alongside your Google+ scopes.
Where you integrate the Google+ API, you will also need to ask for scope https://www.google.com/m8/feeds.
See https://developers.google.com/google-apps/contacts/v3/ for more details.

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