Contributions

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Flatware parallelizes your test suite to significantly reduce test time.
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Rack::UTF8Sanitizer is a Rack middleware which cleans up invalid UTF8 characters in request URI and headers.
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Whitelist-based Ruby HTML and CSS sanitizer.
Article
tl;dr
Do not store emoji unicodes in your database. Store the human-friendly code and support the emoji-cheat-sheet.
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Encode and decode emoji unicode characters into emoji-cheat-sheet form.
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Multi-country zipcode / postal code validation for Rails
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Helper for add social share feature in your Rails app. Twitter, Facebook, Weibo, Douban ...
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ORM agnostic truly Object-Oriented view helper for Rails 3, 4 and 5
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A Capybara driver for headless WebKit to test JavaScript web apps
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Squash your old migrations in a single command
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High Performance Haml Implementation
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Rails way admin interface