Notes posted by w_piekutowski
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Re: Validate an optional URL field
Actually it’s easier to use validates_format_of for this task. Please refer to the comments under the doc.

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CAUTION! :frequency option description is misleading
To use event-based observer, don’t supply :frequency param at all. :frequency => 0 causes JS error.
Use this option only if time-based observer is what you need.