How do I convert a Twitter User ID to a Twitter Username

I'm building an app in Rails that needs to convert a Twitter ID into the Twitter username. This is the code that pulls the ID.

url = 'http://twitter.com/' + params[:username]
buffer = open(url, 'UserAgent' => 'irb').read
@vouched_user_twitter_id = buffer[/\d+(?=\.rss)/]

How do I use that number to pull the username once I no longer have param开发者_运维问答s.

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You can do this with the users/lookup method. This corresponds to the users method of this gem.

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You can get the Twitter username from Twitter ID without using the Twitter API. Calling Twitter API has two issues:

1. It needs an access token after the release of Twitter API version 1.1.

2. The number of requests is limited to 150 requests per hour.

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You are looking up user id by RSS, that wrong.

You can inspect user's avatar in tweet list dom with firebug and use "data-user-id" param. That is if you need to get id once for testing purposes. Otherwise, yes - use twitter API described above.

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Since March 2013 Twitter has changed their REST 1.0 API, now the procedure is different, read more here.