Hi,
this is actually a Ruby question, but I hope I get an answer anyway.
I am looking for a "hash.each.where" function, but I can''t
find
anything.
I have a hash that has a :status key. The value could be ''new''
or
''old''.
Now I want to get only the entries where status is ''new''. I
know how
to do this with an if-clause, but there has to be a better way.
What I want is something like this:
puts "New entries"
hash.each where :status => ''new'' do |new|
puts new
end
puts "Old entries"
hash.each where :status => ''old'' do |old|
puts old
end
I thought maybe the hash.select function could help me, but I only
found that example and I don''t know how to unse the constraints only
for the :status key and not all keys:
h = { "a" => 100, "b" => 200, "c" =>
300 }
h.select {|k,v| k > "a"} #=> {"b" => 200,
"c" => 300}
h.select {|k,v| v < 200} #=> {"a" => 100}
Thanks in advance
Sebastian
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On 30 June 2011 13:27, Sebastian <sebastian.goldt-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:> I have a hash that has a :status key. The value could be ''new'' or > ''old''. > > Now I want to get only the entries where status is ''new''. I know how > to do this with an if-clause, but there has to be a better way.Do you mean you have an array of hashes? Or a hash where each value is an object/array? Can you give an illustration of what your hash looks like, so it''s possible to suggest some solutions. Cheers, -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Sorry,
yes I have an array of hashes:
hash = [{:name => "like", :status => "old"}, {:name
=> "this", :status
=> "new"}, {:name => "here", :status =>
"old"}]
On 30 Jun., 14:31, Michael Pavling
<pavl...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> On 30 June 2011 13:27, Sebastian
<sebastian.go...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
>
> > I have a hash that has a :status key. The value could be
''new'' or
> > ''old''.
>
> > Now I want to get only the entries where status is
''new''. I know how
> > to do this with an if-clause, but there has to be a better way.
>
> Do you mean you have an array of hashes? Or a hash where each value is
> an object/array?
> Can you give an illustration of what your hash looks like, so it''s
> possible to suggest some solutions.
>
> Cheers,
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only_new_entries = array_of_hashes.select { |h| h[:status] == "new" }
~ jf
--
John Feminella
Principal Consultant, BitsBuilder
LI: http://www.linkedin.com/in/johnxf
SO: http://stackoverflow.com/users/75170/
On Thu, Jun 30, 2011 at 09:07, Sebastian
<sebastian.goldt-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org>
wrote:> Sorry,
>
> yes I have an array of hashes:
>
> hash = [{:name => "like", :status => "old"},
{:name => "this", :status
> => "new"}, {:name => "here", :status =>
"old"}]
>
>
>
>
>
> On 30 Jun., 14:31, Michael Pavling
<pavl...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> On 30 June 2011 13:27, Sebastian
<sebastian.go...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> wrote:
>>
>> > I have a hash that has a :status key. The value could be
''new'' or
>> > ''old''.
>>
>> > Now I want to get only the entries where status is
''new''. I know how
>> > to do this with an if-clause, but there has to be a better way.
>>
>> Do you mean you have an array of hashes? Or a hash where each value is
>> an object/array?
>> Can you give an illustration of what your hash looks like, so
it''s
>> possible to suggest some solutions.
>>
>> Cheers,
>
> --
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>
>
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John''s answer. Also, the Ruby Hash API<http://www.ruby-doc.org/core/classes/Hash.html> . On Thu, Jun 30, 2011 at 10:10, John Feminella <johnf-u89qwezJ71hz+5FpPkU+UQ@public.gmane.org> wrote:> only_new_entries = array_of_hashes.select { |h| h[:status] == "new" } > > ~ jf > -- > John Feminella > Principal Consultant, BitsBuilder > LI: http://www.linkedin.com/in/johnxf > SO: http://stackoverflow.com/users/75170/ > > > > On Thu, Jun 30, 2011 at 09:07, Sebastian <sebastian.goldt-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> > wrote: > > Sorry, > > > > yes I have an array of hashes: > > > > hash = [{:name => "like", :status => "old"}, {:name => "this", :status > > => "new"}, {:name => "here", :status => "old"}] > > > > > > > > > > > > On 30 Jun., 14:31, Michael Pavling <pavl...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: > >> On 30 June 2011 13:27, Sebastian <sebastian.go...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> > wrote: > >> > >> > I have a hash that has a :status key. The value could be ''new'' or > >> > ''old''. > >> > >> > Now I want to get only the entries where status is ''new''. I know how > >> > to do this with an if-clause, but there has to be a better way. > >> > >> Do you mean you have an array of hashes? Or a hash where each value is > >> an object/array? > >> Can you give an illustration of what your hash looks like, so it''s > >> possible to suggest some solutions. > >> > >> Cheers, > > > > -- > > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > > To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > > To unsubscribe from this group, send email to > rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en. > > > > > > -- > You received this message because you are subscribed to the Google Groups > "Ruby on Rails: Talk" group. > To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > To unsubscribe from this group, send email to > rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > For more options, visit this group at > http://groups.google.com/group/rubyonrails-talk?hl=en. > >-- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Thank you, that was exactly what I was looking for!!! On 30 Jun., 15:16, Paulo Muggler Moreira <paulomugg...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:> John''s answer. Also, the Ruby Hash > API<http://www.ruby-doc.org/core/classes/Hash.html> > . > > > > > > > > On Thu, Jun 30, 2011 at 10:10, John Feminella <jo...-u89qwezJ71hz+5FpPkU+UQ@public.gmane.org> wrote: > > only_new_entries = array_of_hashes.select { |h| h[:status] == "new" } > > > ~ jf > > -- > > John Feminella > > Principal Consultant, BitsBuilder > > LI:http://www.linkedin.com/in/johnxf > > SO:http://stackoverflow.com/users/75170/ > > > On Thu, Jun 30, 2011 at 09:07, Sebastian <sebastian.go...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> > > wrote: > > > Sorry, > > > > yes I have an array of hashes: > > > > hash = [{:name => "like", :status => "old"}, {:name => "this", :status > > > => "new"}, {:name => "here", :status => "old"}] > > > > On 30 Jun., 14:31, Michael Pavling <pavl...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote: > > >> On 30 June 2011 13:27, Sebastian <sebastian.go...-gM/Ye1E23mwN+BqQ9rBEUg@public.gmane.org> > > wrote: > > > >> > I have a hash that has a :status key. The value could be ''new'' or > > >> > ''old''. > > > >> > Now I want to get only the entries where status is ''new''. I know how > > >> > to do this with an if-clause, but there has to be a better way. > > > >> Do you mean you have an array of hashes? Or a hash where each value is > > >> an object/array? > > >> Can you give an illustration of what your hash looks like, so it''s > > >> possible to suggest some solutions. > > > >> Cheers, > > > > -- > > > You received this message because you are subscribed to the Google Groups > > "Ruby on Rails: Talk" group. > > > To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > > > To unsubscribe from this group, send email to > > rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > > > For more options, visit this group at > >http://groups.google.com/group/rubyonrails-talk?hl=en. > > > -- > > You received this message because you are subscribed to the Google Groups > > "Ruby on Rails: Talk" group. > > To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > > To unsubscribe from this group, send email to > > rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org > > For more options, visit this group at > >http://groups.google.com/group/rubyonrails-talk?hl=en.-- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.
Sebastian <sebastian.goldt@...> writes:> > Thank you, > > that was exactly what I was looking for!!! >Further to the solution provided, if the data is coming from a database, then you can create some scopes to filter the information for you. It might be faster than looping through the array. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To post to this group, send email to rubyonrails-talk-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org To unsubscribe from this group, send email to rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit this group at http://groups.google.com/group/rubyonrails-talk?hl=en.