rails/rails — pull request #4563 by amatsuda (2012-01-20 21:58:21+00:00)
Title: let AR::Relation pretty_printed like an Array

While `pp [model1, model2]` looks like this

```
[#,
#]
```

`pp Model.scoped` prints all AR instances in one line

```
[#, #]
```

Added `AR::Relation#pretty_print` to let `PP` regard a `Relation` as an `Array` of models.