Rails - Sep 2006 - Hashes in array?

Is this possible? If so, how......???


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Oops I meant sessions

bluengreen wrote:
> Is this possible? If so, how......???

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array = [ {:key1 => "value1"}, {:key2 =>"value2"} ]


to retrieve them you can do something like this:

array.each do |hash|
   hash.each do |key, value|
      puts key
      puts value
   end
end

-- 
Posted via http://www.ruby-forum.com/.

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a = [ { :one => 1 } ]

On 9/28/06, bluengreen <pnovess-ee4meeAH724@public.gmane.org>
wrote:
>
>
> Is this possible? If so, how......???
>
>
> >
>

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Hi --

On Wed, 27 Sep 2006, bluengreen wrote:
>
> Is this possible? If so, how......???
[ { 1 => 2, 3 => 4 }, { "apple" => "red",
"banana" => "yellow" } ]


David

-- 
                   David A. Black |
dblack-TKXtfPMJ4Ozk1uMJSBkQmQ@public.gmane.org
Author of "Ruby for Rails"   [1] | Ruby/Rails training &
consultancy [3]
DABlog (DAB''s Weblog)        [2] | Co-director, Ruby Central, Inc.  
[4]
[1] http://www.manning.com/black | [3] http://www.rubypowerandlight.com
[2] http://dablog.rubypal.com    | [4] http://www.rubycentral.org

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>> a = Array.new
=> []
>> h1 = Hash.new
=> {}
>> h2 = Hash.new
=> {}
>> h3 = Hash.new
=> {}
>> h1[:stuff] = ''marshmallows''
=> "marshmallows"
>> h2[:stuff] = ''graham crackers''
=> "graham crackers"
>> h3[:stuff] = ''hershey bar''
=> "hershey bar"
>> a << h1
=> [{:stuff=>"marshmallows"}]
>> a << h2
=> [{:stuff=>"marshmallows"}, {:stuff=>"grahm
crackers"}]
>> a << h3
=> [{:stuff=>"marshmallows"}, {:stuff=>"grahm
crackers"},
{:stuff=>"hershey bar"}]


   

bluengreen wrote:
> Is this possible? If so, how......???
>
>
> >
>
>   

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Guest wrote:
> array = [ {:key1 => "value1"}, {:key2 =>"value2"}
]
> 
> 
> to retrieve them you can do something like this:
> 
> array.each do |hash|
>    hash.each do |key, value|
>       puts key
>       puts value
>    end
> end
What''s the advantage of using :key as opposed to "key"? 
I''ve seen it
advertised as a ''best practice'' on the Rails Wiki, but it
didn''t go into
the rationale.

Thanks,
Nelson

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:key is a Symbol literal which is always the same object in memory.
"key" is a String literal which will create a new object every time
you
say "key". So, there are performance gains, but more important for me
are the semantics of a symbol (think of it like an identifier or a
name) and the simple fact that you type and look at less code.

Symbols are somewhat tricky to really understand, but I think some of
the details are no important once you get used to common usage. They
will eventually be a type of String with Ruby 2, but for now, though
they seem similar, :key.is_a?(String) returns a most certain false.


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Thanks for all the reply''s. Unfortunately i was leaving work when I  
wrote the thread and I was a little brain dead from trying to solve a  
problem. I meant to say into sessions not arrays.

I''m trying to save hashes into the session and I keep getting 500  
errors and TypeErrors.

I''m trying to connect to a LDAP directory and save the entry from a  
search into session for caching from page to page with looking it up  
again.

This is how the applications we have at my work have been written and  
I want to follow the same methodology. But I keep getting the  
errors.  I know it''s probably related to the object/hash being passed  
can not be marshaled. However, my Ruby skills are weak at best. So  
that doesn''t mean squat to me. I pass it to a temp var, I''ve
used
to_s and that works but I can''t get me stuff back out like I want.  
It''s just one big string. I pass the hash using to_hash and it gives  
the same errors as if I passed the object directly.

I dunno. Do you guys know?

thanks,
phill




On Sep 27, 2006, at 6:01 PM, Seth Thomas Rasmussen wrote:
>
> :key is a Symbol literal which is always the same object in memory.
> "key" is a String literal which will create a new object every
time
> you
> say "key". So, there are performance gains, but more important
for me
> are the semantics of a symbol (think of it like an identifier or a
> name) and the simple fact that you type and look at less code.
>
> Symbols are somewhat tricky to really understand, but I think some of
> the details are no important once you get used to common usage. They
> will eventually be a type of String with Ruby 2, but for now, though
> they seem similar, :key.is_a?(String) returns a most certain false.
>
>
> >

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bluengreen ïèøåò:
> Oops I meant sessions
>
> bluengreen wrote:
>   
>> Is this possible? If so, how......???
>>     
Why not ?

session[:blah] = { :apple => ''red'' }
session[:blah][:foo] = ''bar''


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yeah read my follow up...hash in arrays

it''s been a pain....mainly because I don''t know Ruby enough
....

On Sep 27, 2006, at 7:27 PM, Maxim Kulkin wrote:
>
> bluengreen ïèøåò:
>> Oops I meant sessions
>>
>> bluengreen wrote:
>>
>>> Is this possible? If so, how......???
>>>
> Why not ?
>
> session[:blah] = { :apple => ''red'' }
> session[:blah][:foo] = ''bar''
>
>
> >

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you can always examine the contents of the hash in the development error
screen and see the hash arrays (key => ''value'') and see
what you need to
see.

or

create a simple view template that has
<%= debug session %>

which will display your session hash in nice formed statements

Craig

On Wed, 2006-09-27 at 20:09 -0600, phillip novess wrote:
> yeah read my follow up...hash in arrays
> 
> it''s been a pain....mainly because I don''t know Ruby
enough ....
> 
> On Sep 27, 2006, at 7:27 PM, Maxim Kulkin wrote:
> 
> >
> > bluengreen ïèøåò:
> >> Oops I meant sessions
> >>
> >> bluengreen wrote:
> >>
> >>> Is this possible? If so, how......???
> >>>
> > Why not ?
> >
> > session[:blah] = { :apple => ''red'' }
> > session[:blah][:foo] = ''bar''
> >
> >
> > >
> 
> 
> > 

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