Top Questions

1. Is there a Ruby, or Ruby-ism for not_nil? opposite of nil? method?
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2. Rails before_validation strip whitespace best practices
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3. Parse and create ISO 8601 Date and time intervals, like PT15M in PHP
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4. PHP equivalent for Ruby's or-equals (foo ||=bar)?
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5. Getting a list of existing Rails Error classes for re-use/inheritance
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