Need some help with hashes, don't know what fails

ruby-talk
1

Hi all,

I have a hash that contains other hashes, now I'm trying to retreive the
information on those but I can't get the values inside.

Just this code for explain what happens to me:

Im using ruby-1.9.2-p136.

<code>
## just a sample
notifications = Hash.new

notifications['1'] = { what: 'text', who: 'Antonio', when: Time.now}
notifications['2'] = { what: 'text', who: 'Alfonso', when: Time.now}
notifications['3'] = { what: 'text', who: 'Alberto', when: Time.now}

notifications.each do |key, value|
  puts key.inspect # Getting: '1', '2','3' correct
  puts value.inspect # Getting: { what: 'text', who:
'Antonio', when: Time.now} and so on. Correct
  puts value.class # Getting: Hash. Correct
  puts value.has_key?('what') # Getting false. Incorrect
  puts value.has_key?('when') # Getting false. Incorrect
  puts value.has_key?('data') # Getting false. Incorrect

  # I get the values....
  value.each do | k, v |
    puts "#{k}: #{v}"
  end
end
</code>

Thanks in advance.

···

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2

Take another look at value.inspect. Those hash keys are symbols, not
strings. value.has_key? :what et al should work.

···

On Mon, Oct 3, 2011 at 12:42 AM, Antonio Fernández vara <antoniofernandezvara@gmail.com> wrote:

notifications = Hash.new

notifications['1'] = { what: 'text', who: 'Antonio', when: Time.now}
notifications['2'] = { what: 'text', who: 'Alfonso', when: Time.now}
notifications['3'] = { what: 'text', who: 'Alberto', when: Time.now}

notifications.each do |key, value|

--
Carina

3

{ what: 'text', who: 'Antonio', when: Time.now}
is in fact
{ :what => 'text', :who => 'Antonio', :when => Time.now }

the keys are symbols, not strings

so you must

puts value.has_key?(:what)

···

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

4

If this is an accurate portrayal of your hash-of-hashes in the real
code, I suggest you consider an array-of-hashes instead.

···

On Oct 3, 3:42 am, Antonio Fernández vara <antoniofernandezv...@gmail.com> wrote:

## just a sample
notifications = Hash.new

notifications['1'] = { what: 'text', who: 'Antonio', when: Time.now}
notifications['2'] = { what: 'text', who: 'Alfonso', when: Time.now}
notifications['3'] = { what: 'text', who: 'Alberto', when: Time.now}

--
-yossef

5

Thanks both, now I understand I'm doing correctly the hashes.

···

On Mon, Oct 3, 2011 at 9:57 AM, Joey Zhou <yimutang@gmail.com> wrote:

{ what: 'text', who: 'Antonio', when: Time.now}
is in fact
{ :what => 'text', :who => 'Antonio', :when => Time.now }

the keys are symbols, not strings

so you must

puts value.has_key?(:what)

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6

Or even an array of Structs, e.g.

Item = Struct.new :what, :who, :when

notifications = [
  Item['text', 'Antonio', Time.now],
  Item['text', 'Antonio', Time.now],
  Item['text', 'Antonio', Time.now],
]

Kind regards

robert

···

On Tue, Oct 4, 2011 at 2:21 AM, Yossef Mendelssohn <ymendel@pobox.com> wrote:

On Oct 3, 3:42 am, Antonio Fernández vara > <antoniofernandezv...@gmail.com> wrote:

## just a sample
notifications = Hash.new

notifications['1'] = { what: 'text', who: 'Antonio', when: Time.now}
notifications['2'] = { what: 'text', who: 'Alfonso', when: Time.now}
notifications['3'] = { what: 'text', who: 'Alberto', when: Time.now}

If this is an accurate portrayal of your hash-of-hashes in the real
code, I suggest you consider an array-of-hashes instead.

--
remember.guy do |as, often| as.you_can - without end
http://blog.rubybestpractices.com/