From guidoderosa at gmail.com  Fri Aug  5 05:59:09 2011
From: guidoderosa at gmail.com (Guido De Rosa)
Date: Fri, 5 Aug 2011 02:59:09 -0700 (PDT)
Subject: [Facets] deeply "filter" an Hash
Message-ID: <11dd7662-a407-40ac-b6d2-4744220fc72e@b19g2000yqj.googlegroups.com>

Hi!

Given some nested data in form of a Hash:

    h = {
      :a => 1,
      :b => {
        :x => 10,
        :y => 20
      },
      :c=>3
    }

I would like to "authorize" only certain part of such data to pass in,
in a granular way.

    authorize = {
      :a => true,
      :b => {
        :x => true
      }
    }

I would like to get this result:

    filtered = {
      :a => 1,
      :b => {
        :x => 10
      }
    }

There's a way  to get this in facets? Thanks!

 Guido

From transfire at gmail.com  Thu Aug 11 21:37:25 2011
From: transfire at gmail.com (Trans)
Date: Thu, 11 Aug 2011 18:37:25 -0700 (PDT)
Subject: [Facets] deeply "filter" an Hash
In-Reply-To: <11dd7662-a407-40ac-b6d2-4744220fc72e@b19g2000yqj.googlegroups.com>
References: <11dd7662-a407-40ac-b6d2-4744220fc72e@b19g2000yqj.googlegroups.com>
Message-ID: <04832249-a45d-4c5e-95fb-f269fe5b0928@w24g2000yqw.googlegroups.com>



On Aug 5, 5:59?am, Guido De Rosa <guidoder... at gmail.com> wrote:
> Hi!
>
> Given some nested data in form of a Hash:
>
> ? ? h = {
> ? ? ? :a => 1,
> ? ? ? :b => {
> ? ? ? ? :x => 10,
> ? ? ? ? :y => 20
> ? ? ? },
> ? ? ? :c=>3
> ? ? }
>
> I would like to "authorize" only certain part of such data to pass in,
> in a granular way.
>
> ? ? authorize = {
> ? ? ? :a => true,
> ? ? ? :b => {
> ? ? ? ? :x => true
> ? ? ? }
> ? ? }
>
> I would like to get this result:
>
> ? ? filtered = {
> ? ? ? :a => 1,
> ? ? ? :b => {
> ? ? ? ? :x => 10
> ? ? ? }
> ? ? }
>
> There's a way ?to get this in facets? Thanks!

The first layer is easy enough:

  h & [:a, :b]

You can do the second with:

  h[:b] & [:x]

But I get the feeling you want something more general. As far as I can
recall at the moment, there is no such filtering method. Maybe you
would like to create one?