Rails - Mar 2010 - Determine if part of a hash key exists

Hi,

I have a hash something like {:schools_name =>
''''test",  :schools_address => "test, etc....}

What i need to know is does any of the keys contain the word "schools"
in it.

So

hash.has_key? :schools_name will return true

But how can i get it to return true if part of any key contains the
word "schools"

I can think of a couple of ways using a loop but surely there has to
be a quick 1 line way?

JB

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On 11 March 2010 11:13, johnnybutler7
<johnnybutler7-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hi,
>
> I have a hash something like {:schools_name =>
> ''''test",  :schools_address => "test,
etc....}
>
> What i need to know is does any of the keys contain the word
"schools"
> in it.
>
> So
>
> hash.has_key? :schools_name will return true
>
> But how can i get it to return true if part of any key contains the
> word "schools"
>
> I can think of a couple of ways using a loop but surely there has to
> be a quick 1 line way?
>
> JB
>
There''s a few things you can do with enumerable methods
(http://ruby-doc.org/core/classes/Enumerable.html) depending on what
you want to know from the match (just whether it''s in there somewhere;
exactly where it is; all the keys that match; etc)

Personally, I''d recommend looking at "select" and
"detect" methods as
a start, but here''s a line using a loop (like you said ;-)
Run this at the console to see all of the positions of the matches shown.

  hash.keys.each { |hash_key| puts hash_key.to_s =~ /schools/ }

But I *think* this is what you''re after, but if not, hopefully it puts
you on the right track:

  hash.keys.select { |hash_key| hash_key.to_s =~ /schools/ }

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h.each_key.collect {|k| k if k.to_s.include?(''school'') }

irb(main):007:0> h = {:school_name => ''RoR School'',
:school_address => ''RoR
Street''}
=> {:school_name=>"RoR School", :school_address=>"RoR
Street"}
irb(main):008:0> h.each_key.collect {|k| k if
k.to_s.include?(''school'') }
=> [:school_name, :school_address]
irb(main):009:0>

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Ye this is what i had come up with

hash.keys.collect {|k| k.to_s.include?(''schools'') }

like the regular expression better though,

cheers,

JB


On 11 Mar, 11:50, Michael Pavling
<pavl...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> On 11 March 2010 11:13, johnnybutler7
<johnnybutl...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
>
>
>
> > Hi,
>
> > I have a hash something like {:schools_name =>
> > ''''test",  :schools_address => "test,
etc....}
>
> > What i need to know is does any of the keys contain the word
"schools"
> > in it.
>
> > So
>
> > hash.has_key? :schools_name will return true
>
> > But how can i get it to return true if part of any key contains the
> > word "schools"
>
> > I can think of a couple of ways using a loop but surely there has to
> > be a quick 1 line way?
>
> > JB
>
> There''s a few things you can do with enumerable methods
> (http://ruby-doc.org/core/classes/Enumerable.html) depending on what
> you want to know from the match (just whether it''s in there
somewhere;
> exactly where it is; all the keys that match; etc)
>
> Personally, I''d recommend looking at "select" and
"detect" methods as
> a start, but here''s a line using a loop (like you said ;-)
> Run this at the console to see all of the positions of the matches shown.
>
>   hash.keys.each { |hash_key| puts hash_key.to_s =~ /schools/ }
>
> But I *think* this is what you''re after, but if not, hopefully it
puts
> you on the right track:
>
>   hash.keys.select { |hash_key| hash_key.to_s =~ /schools/ }
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