From: Edmond Kachale <kachaleedmond@...>
Date: 2011-10-28T15:00:19+09:00
Subject: Re: Unusual behavior of a Ruby hash

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2011/10/27 Jes=FAs Gabriel y Gal=E1n <jgabrielygalan@gmail.com>

> If you need to deep copy a nested object structure you can use this idiom=
:
>
> x =3D [[...]] # whatever, a nested set of arrays, etc
> y =3D Marshal.load(Marshal.dump(x))
>

 That was a program saver!! It has worked the "magickie" like Superman!!
(Indeed, One key to career growth is never to stop learning (
http://tek.io/n4EDNP))

---
*Edmond*
*
One key to career growth is never to stop learning (http://tek.io/n4EDNP)*



2011/10/27 Jes=FAs Gabriel y Gal=E1n <jgabrielygalan@gmail.com>

> On Thu, Oct 27, 2011 at 10:53 AM, Edmond Kachale
> <kachaleedmond@gmail.com> wrote:
> > In fact, Jesus should be the program saviour (i'm kidding).
> >
> > 2011/10/25 Jes=FAs Gabriel y Gal=E1n <jgabrielygalan@gmail.com>
> >
> >> Well, first of all, it seems that essential_params has a key
> :params_hash,
> >> so I guess it's something like:
> >>
> >
> >> essential_params =3D {:params_hash =3D> {:val_1 =3D> 0, :val_2 =3D> [x=
,y,z],
> >>
> > :val_3 =3D>0}}
> >>
> >
> > I agree. In fact,  :params_hash in essential_params is an array of
> hashes.
> >
> > So, modify your line 15 to this:
> >>
> >>      new_data[:params_hash]  =3D essential_params[:params_hash].dup
> >>
> >> and let us know if it worked for you.
> >>
> >> Hope this helps,
> >>
> >
> > I should say, it took me this long to get all this was getting messed u=
p.
> As
> > it was rightly put by Jesus, I needed to duplicate
> > essential_params[:params_hash]. Since essential_params[:params_hash] is
> also
> > an array of hashes, at every iteration I have to duplicate each hash
> element
> > of the "essential_params[:params_hash]" array. Though I do not love the
> > repetitive "semi-manual" duplication, but it is much more efficient tha=
n
> the
> > repetitive database querying.
> >
> > In due course, I have learned two good methods and their differences:
> *clone
> > * and *dup* (
> > http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/6326).
> >
> > Thanks folks!!
>
> If you need to deep copy a nested object structure you can use this idiom=
:
>
> x =3D [[...]] # whatever, a nested set of arrays, etc
> y =3D Marshal.load(Marshal.dump(x))
>
> Take into account, though, that there are things that Marshal.dump
> will not dump, like default_procs of hashes, for example.
> But if you just have regular arrays and hashes it should be fine.
>
> Jesus.
>
>

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