Ruby on Rails

Just in case, do you really need that level of locking?

Perhaps you know it, but in web programming "the last edit wins" is a
meaningful rule that allows you to get rid of these controls. If two
people edit the same form, the last received data is the one that
prevails, it doesn't matter who requested the form first. In
particular it does not matter whether that happened in parallel or
sequentially but just immediately. The data of the first guy will be
overwritten anyway, so in practice often it does not matter.

If it does matter in your use case please just disregard this mail.

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