Instead of building up a Hash in this way, I would prefer you create it using [`Hash::[]`](http://www.ruby-doc.org/core-1.9.3/Hash.html#method-c-5B-5D) and actually use proper Post objects.

```ruby
posts = Tumblr::Post.perform client.posts(...)
Hash[ posts.each {|post| [post.id, post.url]} ]
```