intridea/grape — pull request #333 by flyerhzm (2013-02-12 06:05:28+00:00)
Title: validation for array in params

validation support for array in params, like

```
{
name: "Post",
tags: [{name: "ruby"}, {name: "python"}]
}
```

```
params do
group :tags do
requires :name
end
end
```