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Pierre Valade

2007-Nov-29 19:23 UTC

Method on a array of objects from the database

Hello,

I would like to know the more elegant way to add a method for an array
of objects from the database.

Let me give an example :

Class Product
 ....
end

And in my controller :

@products = Product.find(:all)

And now I want to define a method which I could like

@products.select_fruits

having said somewhere :

def select_fruits
 ....
end

Thank you very much,

Pierre
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Greg Willits

2007-Nov-29 19:48 UTC

head link

Re: Method on a array of objects from the database

On Nov 29, 2007, at 11:23 AM, Pierre Valade wrote:
> I would like to know the more elegant way to add a method for an array
> of objects from the database.
>
> Let me give an example :
>
> Class Product
>  ....
> end
>
> And in my controller :
>
> @products = Product.find(:all)
>
> And now I want to define a method which I could like
>
> @products.select_fruits
>
> having said somewhere :
>
> def select_fruits
>  ....
> end
Is you question about where those methods should go? They can, and  
usually should, go in the model.

class Product

def self.find_all
   find(:all, .....)
end

def self.select_fruits(parameters)
    find(:all, :conditions...
end

end

--- controller --

fruits = Product.select_fruits(:fruit_type = params[:....])



--
def gw
   acts_as_n00b
   writes_at(www.railsdev.ws)
end




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Pierre Valade

2007-Nov-29 19:52 UTC

head link

Re: Method on a array of objects from the database

Thank you for your answer but my question is how to add method to an
array of @products.

I have : @products.find(:all)

Then, if I want to select only fruits from @products, I could do :
@products.select {...}
And it''s this select that I want to put in a method select_fruits so
that I could do :

@products.select_fruits which corresponds to @products.select { ... }

Thank you,
Pierre

On 29 nov, 20:48, Greg Willits
<li...-0Bv1hcaDFPRk211Z5VL+QA@public.gmane.org>
wrote:> On Nov 29, 2007, at 11:23 AM, Pierre Valade wrote:
>
>
>
> > I would like to know the more elegant way to add a method for an array
> > of objects from the database.
>
> > Let me give an example :
>
> > Class Product
> >  ....
> > end
>
> > And in my controller :
>
> > @products = Product.find(:all)
>
> > And now I want to define a method which I could like
>
> > @products.select_fruits
>
> > having said somewhere :
>
> > def select_fruits
> >  ....
> > end
>
> Is you question about where those methods should go? They can, and
> usually should, go in the model.
>
> class Product
>
> def self.find_all
>    find(:all, .....)
> end
>
> def self.select_fruits(parameters)
>     find(:all, :conditions...
> end
>
> end
>
> --- controller --
>
> fruits = Product.select_fruits(:fruit_type = params[:....])
>
> --
> def gw
>    acts_as_n00b
>    writes_at(www.railsdev.ws)
> end--~--~---------~--~----~------------~-------~--~----~
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Brian Hogan

2007-Nov-29 20:34 UTC

head link

Re: Method on a array of objects from the database

One way is to make your own finder directly on the model

class Product < ActiveRecord::Base

   def self.find_all_fruits
     self.find :all, :condition => ["category = "fruit"]
   end

end


Although you don''t have to  bother if you can tell by looking at a
field.
For example, if you have a "category" column that shows
"fruit", you can
just use a dynamic finder for that

@fruit = Product.find_all_by_category("fruit")
@fruit_in_stock =
Product.find_all_by_category_and_available("fruit",true)

You should be letting your database do the work of filtering records, as
that''s its job. You don''t want to iterate and reject / filter
records in
Ruby. It''s much slower. It looks cool but it''s not worth it.








On Nov 29, 2007 1:52 PM, Pierre Valade
<pierre.valade-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> Thank you for your answer but my question is how to add method to an
> array of @products.
>
> I have : @products.find(:all)
>
> Then, if I want to select only fruits from @products, I could do :
> @products.select {...}
> And it''s this select that I want to put in a method select_fruits
so
> that I could do :
>
> @products.select_fruits which corresponds to @products.select { ... }
>
> Thank you,
> Pierre
>
> On 29 nov, 20:48, Greg Willits
<li...-0Bv1hcaDFPRk211Z5VL+QA@public.gmane.org> wrote:
> > On Nov 29, 2007, at 11:23 AM, Pierre Valade wrote:
> >
> >
> >
> > > I would like to know the more elegant way to add a method for an
array
> > > of objects from the database.
> >
> > > Let me give an example :
> >
> > > Class Product
> > >  ....
> > > end
> >
> > > And in my controller :
> >
> > > @products = Product.find(:all)
> >
> > > And now I want to define a method which I could like
> >
> > > @products.select_fruits
> >
> > > having said somewhere :
> >
> > > def select_fruits
> > >  ....
> > > end
> >
> > Is you question about where those methods should go? They can, and
> > usually should, go in the model.
> >
> > class Product
> >
> > def self.find_all
> >    find(:all, .....)
> > end
> >
> > def self.select_fruits(parameters)
> >     find(:all, :conditions...
> > end
> >
> > end
> >
> > --- controller --
> >
> > fruits = Product.select_fruits(:fruit_type = params[:....])
> >
> > --
> > def gw
> >    acts_as_n00b
> >    writes_at(www.railsdev.ws)
> > end
> >
>
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Ilan Berci

2007-Nov-29 21:37 UTC

head link

Re: Method on a array of objects from the database

> 
> @products = Product.find(:all)
> 
> And now I want to define a method which I could like
> 
> @products.select_fruits
> 
> having said somewhere :
> 

module Foo
  def select_fruits
    # some code here
  end
end

# meanwhile.. back on the farm..
@products = Product.find(:all)
@products.extend Foo

=================== Or even better.. ========================class Product
  belongs_to :fruit, :extends => Foo
end

Look for "Association extensions" within the Rails api..

hth..

ilan

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

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Pierre Valade

2007-Nov-30 09:20 UTC

head link

Re: Method on a array of objects from the database

Thanks you ! It''s great !
Pierre

On 29 nov, 22:37, Ilan Berci
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:> > @products = Product.find(:all)
>
> > And now I want to define a method which I could like
>
> > @products.select_fruits
>
> > having said somewhere :
>
> module Foo
>   def select_fruits
>     # some code here
>   end
> end
>
> # meanwhile.. back on the farm..
> @products = Product.find(:all)
> @products.extend Foo
>
> =================== Or even better.. ========================> class
Product
>   belongs_to :fruit, :extends => Foo
> end
>
> Look for "Association extensions" within the Rails api..
>
> hth..
>
> ilan
>
> --
> Posted viahttp://www.ruby-forum.com/.--~--~---------~--~----~------------~-------~--~----~
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Rails - Nov 2007 - Method on a array of objects from the database

Method on a array of objects from the database

Re: Method on a array of objects from the database

Re: Method on a array of objects from the database

Re: Method on a array of objects from the database

Re: Method on a array of objects from the database

Re: Method on a array of objects from the database