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Mike

2007-Apr-26 07:11 UTC

Selecting a model

I have three models:  Language, Country and City.

A country has a Language and a language belongs to many countries.
A country has many cities and a city belongs to a country.

When I use Active(Scaffold) and I want to edit/insert a City, I must
select a Country. Is possible that when I must select a country, in the
list of countries appear the Country + the language.

For example:

USA-English
France-French
England-English
...

instead of:

USA
France
England
...


Thanks.

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

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Ivor Paul

2007-Apr-26 08:57 UTC

head link

Re: Selecting a model

Sure, I assume you do a query for the countries -> @countries = Country.find
(:all)

for starters do this
@countries = Country.find(:all, :include => ''languages'')
which will get the
languages in the same query.

Now, in the select you have options_for_select=[array] so you have to build
an array that looks like this ["USA -
English","France-French","England-English",...]

I would suggest that you create a helper method

def country_options(country_array)
  reponse_array = []
  country_array.each do |country|
    response_array << country.name + " - " +
country.language.name
  end
  return reponse_array
end

reponse array wil now look like this ["USA -
English","France-French","England-English",...]

so you can do <%= select_tag(:country,
options_for_select(country_options(@countries))) %> and that will give you
the select you wanted.


On 4/26/07, Mike
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:>
>
> I have three models:  Language, Country and City.
>
> A country has a Language and a language belongs to many countries.
> A country has many cities and a city belongs to a country.
>
> When I use Active(Scaffold) and I want to edit/insert a City, I must
> select a Country. Is possible that when I must select a country, in the
> list of countries appear the Country + the language.
>
> For example:
>
> USA-English
> France-French
> England-English
> ...
>
> instead of:
>
> USA
> France
> England
> ...
>
>
> Thanks.
>
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>
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David A. Black

2007-Apr-26 11:25 UTC

head link

Re: Selecting a model

Hi --

On 4/26/07, Ivor Paul <ivorpaul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> Sure, I assume you do a query for the countries -> @countries >
Country.find(:all)
>
> for starters do this
> @countries = Country.find(:all, :include =>
''languages'') which will get the
> languages in the same query.
>
> Now, in the select you have options_for_select=[array] so you have to build
> an array that looks like this ["USA -
> English","France-French","England-English",...]
I believe you''d actually need something like:

  [ ["USA-English", "USA"], ["France-French",
"French"], ... ]

so that you''re providing both a label and a value for each option.
> I would suggest that you create a helper method
>
> def country_options(country_array)
>   reponse_array = []
>   country_array.each do |country|
>     response_array << country.name + " - " +
country.language.name
>   end
>   return reponse_array
> end
You''ve just reimplemented map :-)  You can let Ruby do more of the
work (untested):

  def country_options(countries)
     countries.map do |country|
       [country.name + ''-'' + country.language.name,
country.name]
     end
  end

You could also use country.id instead of country.name for the value,
which might make it slightly easier to pull the record later.


David

-- 
Upcoming Rails training by Ruby Power and Light:
  Four-day Intro to Intermediate
  May 8-11, 2007
  Edison, NJ
  http://www.rubypal.com/events/05082007

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Ivor Paul

2007-Apr-26 12:03 UTC

head link

Re: Selecting a model

Thanks David.

Yes, I should have done the [text_value,id] - forgot about that :)

map! nice, yeah, thanks for the tip. So map creates an array populated with
the result of the block for each element in the array that is being mapped?
the result is then the array containing the results for each of the original
elements.

thanks again

Ivor

On 4/26/07, David A. Black
<dblack-TKXtfPMJ4Ozk1uMJSBkQmQ@public.gmane.org>
wrote:>
>
> Hi --
>
> On 4/26/07, Ivor Paul
<ivorpaul-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > Sure, I assume you do a query for the countries -> @countries >
> Country.find(:all)
> >
> > for starters do this
> > @countries = Country.find(:all, :include =>
''languages'') which will get
> the
> > languages in the same query.
> >
> > Now, in the select you have options_for_select=[array] so you have to
> build
> > an array that looks like this ["USA -
> >
English","France-French","England-English",...]
>
> I believe you''d actually need something like:
>
>   [ ["USA-English", "USA"], ["France-French",
"French"], ... ]
>
> so that you''re providing both a label and a value for each option.
>
> > I would suggest that you create a helper method
> >
> > def country_options(country_array)
> >   reponse_array = []
> >   country_array.each do |country|
> >     response_array << country.name + " - " +
country.language.name
> >   end
> >   return reponse_array
> > end
>
> You''ve just reimplemented map :-)  You can let Ruby do more of the
> work (untested):
>
>   def country_options(countries)
>      countries.map do |country|
>        [country.name + ''-'' + country.language.name,
country.name]
>      end
>   end
>
> You could also use country.id instead of country.name for the value,
> which might make it slightly easier to pull the record later.
>
>
> David
>
> --
> Upcoming Rails training by Ruby Power and Light:
>   Four-day Intro to Intermediate
>   May 8-11, 2007
>   Edison, NJ
>   http://www.rubypal.com/events/05082007
>
> >
>
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Rails - Apr 2007 - Selecting a model

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