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Can I append hash to hashes?

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  Can I append hash to hashes? Siratinee Sukachai <ploy.sukachai@gmail.com> - 2011-04-22 02:22 -0500
    Re: Can I append hash to hashes? Giampiero Zanchi <cidza@tin.it> - 2011-04-22 02:40 -0500
    Re: Can I append hash to hashes? Quintus <sutniuq@gmx.net> - 2011-04-22 02:53 -0500
      Re: Can I append hash to hashes? Siratinee Sukachai <ploy.sukachai@gmail.com> - 2011-04-22 03:13 -0500
        Re: Can I append hash to hashes? Robert Dober <robert.dober@gmail.com> - 2011-04-22 04:07 -0500
    Re: Can I append hash to hashes? Siratinee Sukachai <ploy.sukachai@gmail.com> - 2011-04-22 05:43 -0500

#3362 — Can I append hash to hashes?

I need to do a hash some kind like this:
Member => {email => Email, name => Name, lastname => Lastname}

But I get a hash in foreach loop so I need to append a hash to hashes.
e.g.
First round: Member => {email => Email}
Second round: Member => {email => Email, name => Name}
Third round: Member => {email => Email, name => Name, lastname =>
Lastname}

Can I do that and how?
In my case I cannot do the array because I need to use this hash to
generate yaml later.
If I do as the array, the formatting what I get in yaml is not what I
need.
Pls help...

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#3364

maybe I cannot understand your problem (?)

hsh = {:member => {:email => "Email", :name => "Name", :lastname => 
"Lastname"}}
p hsh

internal_h = {:email => "Email", :name => "Name", :lastname => 
"Lastname"}
external_h = {}
external_h[:member] = internal_h
p external_h

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#3367

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Hash: SHA1

Am 22.04.2011 09:22, schrieb Siratinee Sukachai:
> I need to do a hash some kind like this:
> Member => {email => Email, name => Name, lastname => Lastname}
> 
> But I get a hash in foreach loop so I need to append a hash to hashes.
> e.g.
> First round: Member => {email => Email}
> Second round: Member => {email => Email, name => Name}
> Third round: Member => {email => Email, name => Name, lastname =>
> Lastname}
> 
> Can I do that and how?
> In my case I cannot do the array because I need to use this hash to
> generate yaml later.
> If I do as the array, the formatting what I get in yaml is not what I
> need.
> Pls help...
> 

Have a look at the Hash#merge and Hash#merge! methods.

http://www.ruby-doc.org/core/classes/Hash.html#M000759
http://www.ruby-doc.org/core/classes/Hash.html#M000758

Vale,
Marvin
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#3368

Actually, I need to do like in array which I can use << to assign more 
value into array. Anyways can I do that in hash?

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#3372

On Fri, Apr 22, 2011 at 10:13 AM, Siratinee Sukachai
<ploy.sukachai@gmail.com> wrote:
> Actually, I need to do like in array which I can use << to assign more
> value into array. Anyways can I do that in hash?

Sure there are two ways, the destructive one, in which the receiver is
modified with #update

>> h={:a=>42}
=> {:a=>42}
>> h.update(:b => 43)
=> {:b=>43, :a=>42}
>> h
=> {:b=>43, :a=>42}
>>

or the constructive, in which the receiver is not modified, with #merge

>> h={:a=>42}
=> {:a=>42}
>> h.merge(:b => 43)
=> {:b=>43, :a=>42}
>> h
=> {:a=>42}

Be aware of the fact, that in case of conflicting keys the values of
the argument are used, this can be handled by the block form of
#update and #merge, as described here
http://www.rubydoc.info/stdlib/core/1.9.2/Hash
HTH
Robert
> --
> Posted via http://www.ruby-forum.com/.
>
>



-- 
The 1,000,000th fibonacci number contains '42' 2039 times; that is
almost 30 occurrences more than expected (208988 digits).
N.B. The 42nd fibonacci number does not contain '1000000' that is
almost the expected 3.0e-06 times.

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#3377

thanks Robert, it works.

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