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Remove obsolete explanation 

about passing string to `:if` and `:unless`.
This is a follow up to https://github.com/rails/rails/pull/28058 [ci
skip]
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ohbarye 2017-08-17 23:49:49 +09:00
parent 251d3f9151
commit 8779e33a4b
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guides/source/active_record_validations.md
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@ -892,7 +892,7 @@ Conditional Validation
Sometimes it will make sense to validate an object only when a given predicate
is satisfied. You can do that by using the `:if` and `:unless` options, which
can take a symbol, a string, a `Proc` or an `Array`. You may use the `:if`
can take a symbol, a `Proc` or an `Array`. You may use the `:if`
option when you want to specify when the validation **should** happen. If you
want to specify when the validation **should not** happen, then you may use the
`:unless` option.