如何从红宝石的哈希数组中获取键/值对？

Question

I have an array of hashes (or atleast I think they are hashes) and I need to pull out the ID for each of them. I'm sure ruby has some quick way of doing this ... I just can't figure it out.

I don't want to iterate through the arrays and build a new one.

[
  [
    {
      "bio": "I am a tech geek who loves starting up companies. While I was in college, I founded Squeeze My Tees",
      "business_name": "Rounded Development",
      "city": "",
      "created_at": "2012-04-22T18:07:44Z",
      "first_name": "Brian",
      "id": 1,
      "industry": "Entertainment",
      "last_name": "Weinreich",
      "lat": null
    },
    {
      "access_token": null,
      "bio": null,
      "business_name": null,
      "city": null,
      "created_at": "2012-04-23T13:56:35Z",
      "email": "test@jambo.com",
      "first_name": "asdad",
      "id": 2,
      "industry": null,
      "last_name": "ddfs",
      "lat": null,
      "linkedin_id": null,
      "linkedin_url": null,
      "lng": null,
      "position": null,
      "professional_headline": null,
      "state": null,
      "street": null,
      "updated_at": "2012-04-23T13:56:35Z"
    },
    {
      "access_token": null,
      "bio": null,
      "business_name": null,
      "city": null,
      "created_at": "2012-04-23T13:56:39Z",
      "email": "tesasdat@jambo.com",
      "first_name": "fdsd",
      "id": 3,
      "industry": null,
      "last_name": "asdgw",
      "lat": null,
      "linkedin_id": null,
      "linkedin_url": null,
      "lng": null,
      "position": null,
      "professional_headline": null,
      "state": null,
      "street": null,
      "updated_at": "2012-04-23T13:56:39Z"
    },
    {
      "access_token": null,
      "bio": null,
      "business_name": null,
      "city": null,
      "created_at": "2012-04-23T13:56:44Z",
      "email": "asdsad@jambo.com",
      "first_name": "ewtrwef",
      "id": 4,
      "industry": null,
      "last_name": "dfd",
      "lat": null,
      "linkedin_id": null,
      "linkedin_url": null,
      "lng": null,
      "position": null,
      "professional_headline": null,
      "state": null,
      "street": null,
      "updated_at": "2012-04-23T13:56:44Z"
    }
  ]
]

Answer 1

To pull out just the IDs you can do this:

the_IDs = array_of_hashes.collect { |single_array| single_array["id"] }

Obviously you can use less verbose variable names, they're just for illustration. But the idea is that you can loop through an array and collect whatever the block returns. In this case, you keep getting an ID returned, and the_IDs will just be an array of what was collected.