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Erwin

2011-Feb-27 18:29 UTC

How to store the same key multi times in a Hash ?

given an Arra tags[]

I need to produce a resulting Hash as following ..

{ "$in" => [tags[0]], "$in" =>[tags[1], ...}

in which the key should be always the same and the value being an
Array

I tried this :

         myHash = {}
         tags.each do |tag|
           h = {"$in" => [tag]}
           myHash.merge!(h)
         end

but the merge! is only  changing the value ...  (as the key is always
the same ..)
(there is no += as with Array class  ...)

thanks for your feedback

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Frederick Cheung

2011-Feb-27 18:47 UTC

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Re: How to store the same key multi times in a Hash ?

On Feb 27, 6:29 pm, Erwin <yves_duf...-ee4meeAH724@public.gmane.org>
wrote:> given an Arra tags[]
>
> I need to produce a resulting Hash as following ..
>
> { "$in" => [tags[0]], "$in" =>[tags[1], ...}
>
> in which the key should be always the same and the value being an
> Array
>
By definition, a hash stores a single value for a given key. The
closest you''ll get is to make the value an array of all the things for
the key in question.

Fred

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Hasan Iskandar

2011-Feb-27 19:06 UTC

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Re: How to store the same key multi times in a Hash ?

I agree with Frederick Cheung.

Your code will be like this :

  myHashes = []
  tags.each do |tag|
    h = {"$in" => [tag]}
    myHash << h
  end

and myHashes will contains :

  [{ "$in" => [tags[0]]}, {"$in" =>[tags[1]}, ...]

which myHashes is an array of hashes.

Hope this can help you :)

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Erwin

2011-Feb-27 19:16 UTC

head link

How to store the same key multi times in a Hash ?

given an Arra tags[]

I need to produce a resulting Hash as following ..

{ "$in" => [tags[0]], "$in" =>[tags[1], ...}

in which the key should be always the same and the value being an
Array

I tried this :

         myHash = {}
         tags.each do |tag|
           h = {"$in" => [tag]}
           myHash.merge!(h)
         end

but the merge! is only  changing the value ...  (as the key is always
the same ..)
(there is no += as with Array class  ...)

thanks for your feedback

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Erwin

2011-Feb-27 19:17 UTC

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Re: How to store the same key multi times in a Hash ?

thanks a lot .. !!!

On 27 fév, 20:06, Hasan Iskandar
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:> I agree with Frederick Cheung.
>
> Your code will be like this :
>
>   myHashes = []
>   tags.each do |tag|
>     h = {"$in" => [tag]}
>     myHash << h
>   end
>
> and myHashes will contains :
>
>   [{ "$in" => [tags[0]]}, {"$in" =>[tags[1]},
...]
>
> which myHashes is an array of hashes.
>
> Hope this can help you :)
>
> --
> Posted viahttp://www.ruby-forum.com/.
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Erwin

2011-Feb-27 19:53 UTC

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Re: How to store the same key multi times in a Hash ?

I was happy too  quickly ...

I actually need to produce a structure like this ( to be used with
Mongoid DB criteria )

{ "$in" => [tags[0]], "$in" =>[tags[1]] , ....}

I may have to use a json structure ?



On 27 fév, 20:16, Erwin <yves_duf...-ee4meeAH724@public.gmane.org>
wrote:> given an Arra tags[]
>
> I need to produce a resulting Hash as following ..
>
> { "$in" => [tags[0]], "$in" =>[tags[1], ...}
>
> in which the key should be always the same and the value being an
> Array
>
> I tried this :
>
>          myHash = {}
>          tags.each do |tag|
>            h = {"$in" => [tag]}
>            myHash.merge!(h)
>          end
>
> but the merge! is only  changing the value ...  (as the key is always
> the same ..)
> (there is no += as with Array class  ...)
>
> thanks for your feedback
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Erwin

2011-Feb-27 19:56 UTC

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Re: How to store the same key multi times in a Hash ?

this is to be used with MongoID as a criteria

criteria.where(:tags => { "$in" => [tags[0]], "$in"
=>[tags[1]] }).to_a

any suggestion with json structure ?

thanks Fred

On 27 fév, 19:47, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> On Feb 27, 6:29 pm, Erwin <yves_duf...-ee4meeAH724@public.gmane.org>
wrote:
>
> > given an Arra tags[]
>
> > I need to produce a resulting Hash as following ..
>
> > { "$in" => [tags[0]], "$in" =>[tags[1], ...}
>
> > in which the key should be always the same and the value being an
> > Array
>
> By definition, a hash stores a single value for a given key. The
> closest you''ll get is to make the value an array of all the things
for
> the key in question.
>
> Fred
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Frederick Cheung

2011-Feb-27 20:49 UTC

head link

Re: How to store the same key multi times in a Hash ?

On Feb 27, 7:56 pm, Erwin <yves_duf...-ee4meeAH724@public.gmane.org>
wrote:> this is to be used with MongoID as a criteria
>
> criteria.where(:tags => { "$in" => [tags[0]],
"$in"
> =>[tags[1]] }).to_a
>
> any suggestion with json structure ?
>
You can''t repeat keys in a json hash either. What are you actually
trying to do?

Fred
>
> On 27 fév, 19:47, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
>
> > On Feb 27, 6:29 pm, Erwin
<yves_duf...-ee4meeAH724@public.gmane.org> wrote:
>
> > > given an Arra tags[]
>
> > > I need to produce a resulting Hash as following ..
>
> > > { "$in" => [tags[0]], "$in" =>[tags[1],
...}
>
> > > in which the key should be always the same and the value being an
> > > Array
>
> > By definition, a hash stores a single value for a given key. The
> > closest you''ll get is to make the value an array of all the
things for
> > the key in question.
>
> > Fred
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Erwin

2011-Feb-27 21:49 UTC

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Re: How to store the same key multi times in a Hash ?

I need to write a Mongoid criteria

criteria.where(:tags => myStruct ).to_a

in which myStruct will have this structure   { "$in" =>
[check_tags[0]], "$in" =>[check_tags[1]] , .. }
built from a check_tags Array

it''s a sequence of .in criteria
I am checking if ALL of the elements of check_tags[] are included in a
Mongoid record Array field :tags

the simplest Mongoid criteria:
criteria.in(:tags => tags)
just perform a checking on ANY element included, not ALL



On 27 fév, 21:49, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> On Feb 27, 7:56 pm, Erwin <yves_duf...-ee4meeAH724@public.gmane.org>
wrote:
>
> > this is to be used with MongoID as a criteria
>
> > criteria.where(:tags => { "$in" => [tags[0]],
"$in"
> > =>[tags[1]] }).to_a
>
> > any suggestion with json structure ?
>
> You can''t repeat keys in a json hash either. What are you actually
> trying to do?
>
> Fred
>
>
>
>
>
>
>
>
>
> > On 27 fév, 19:47, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > > On Feb 27, 6:29 pm, Erwin
<yves_duf...-ee4meeAH724@public.gmane.org> wrote:
>
> > > > given an Arra tags[]
>
> > > > I need to produce a resulting Hash as following ..
>
> > > > { "$in" => [tags[0]], "$in"
=>[tags[1], ...}
>
> > > > in which the key should be always the same and the value
being an
> > > > Array
>
> > > By definition, a hash stores a single value for a given key. The
> > > closest you''ll get is to make the value an array of all
the things for
> > > the key in question.
>
> > > Fred
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Erwin

2011-Feb-27 22:19 UTC

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Re: How to store the same key multi times in a Hash ?

Thanks fred .. found how to do it....
there is a specific criteria for it ( I did not fully understand when
reading it the first time...)

Criteria#all_in:
Matches if all values provided match, useful for doing exact matches
on arrays.

so writing :
criteria.all_in(:tags => tags ).to_a

did it ...

I''ll try to give an eye to the underlaying Mongoid ruby code in charge
of doing that ....

On 27 fév, 21:49, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> On Feb 27, 7:56 pm, Erwin <yves_duf...-ee4meeAH724@public.gmane.org>
wrote:
>
> > this is to be used with MongoID as a criteria
>
> > criteria.where(:tags => { "$in" => [tags[0]],
"$in"
> > =>[tags[1]] }).to_a
>
> > any suggestion with json structure ?
>
> You can''t repeat keys in a json hash either. What are you actually
> trying to do?
>
> Fred
>
>
>
>
>
>
>
>
>
> > On 27 fév, 19:47, Frederick Cheung
<frederick.che...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > > On Feb 27, 6:29 pm, Erwin
<yves_duf...-ee4meeAH724@public.gmane.org> wrote:
>
> > > > given an Arra tags[]
>
> > > > I need to produce a resulting Hash as following ..
>
> > > > { "$in" => [tags[0]], "$in"
=>[tags[1], ...}
>
> > > > in which the key should be always the same and the value
being an
> > > > Array
>
> > > By definition, a hash stores a single value for a given key. The
> > > closest you''ll get is to make the value an array of all
the things for
> > > the key in question.
>
> > > Fred
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Jim Ruther Nill

2011-Feb-27 23:58 UTC

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Re: Re: How to store the same key multi times in a Hash ?

On Mon, Feb 28, 2011 at 3:53 AM, Erwin
<yves_dufour-ee4meeAH724@public.gmane.org> wrote:
> I was happy too  quickly ...
>
> I actually need to produce a structure like this ( to be used with
> Mongoid DB criteria )
>
> { "$in" => [tags[0]], "$in" =>[tags[1]] , ....}
>
>you can''t. a hash should have unique keys.

> I may have to use a json structure ?
>
>
>
> On 27 fév, 20:16, Erwin <yves_duf...-ee4meeAH724@public.gmane.org>
wrote:
> > given an Arra tags[]
> >
> > I need to produce a resulting Hash as following ..
> >
> > { "$in" => [tags[0]], "$in" =>[tags[1], ...}
> >
> > in which the key should be always the same and the value being an
> > Array
> >
> > I tried this :
> >
> >          myHash = {}
> >          tags.each do |tag|
> >            h = {"$in" => [tag]}
> >            myHash.merge!(h)
> >          end
> >
> > but the merge! is only  changing the value ...  (as the key is always
> > the same ..)
> > (there is no += as with Array class  ...)
> >
> > thanks for your feedback
>
> --
> You received this message because you are subscribed to the Google Groups
> "Ruby on Rails: Talk" group.
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>
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>
>

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