ruby-grape / grape / 5449198434

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Allow specifying a handler for grape_exceptions (#2342)

* Allow specifying a handler for grape_exceptions

This allows you to customize the format of the error response for grape exceptions:

For example, you could do something like this:

```rb
rescue_from :grape_exceptions do |e|
  error!({ errors: [{ code: 'Error', message: e.message.squish }] }, e.status)
end
```

which would render like this:

```
{
  "errors": [
    {
      "code": "Error",
      "message": "Problem: message body does not match declared format Resolution: when specifying application/json as content-type, you must pass valid application/json in the request's 'body'"
    }
  ]
}
```

* match format

* Fix issue caught by tests

* Update README & CHANGELOG

* Add spec to demonstrate usage

* Fix rubocop offenses

* Fix rubocop offences

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