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added note for mutually_exclusive params #1720

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Dec 20, 2017
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added note for mutually_exclusive params #1720

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2 changes: 2 additions & 0 deletions README.md
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Expand Up @@ -1299,6 +1299,8 @@ params do
end
```

Note that using `:default` with `mutually_exclusive` will cause multiple parameters to always have a default value and raise a `Grape::Exceptions::Validation` mutually exclusive exception.

#### `at_least_one_of`

Parameters can be defined as 'at_least_one_of', ensuring that at least one parameter gets selected.
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