Rails - Jun 2011 - ActiveRecord array/collection manage

Hello, I have a model like this:

class Car < ActiveRecord::Base
  def color(c)
    where("color = ?",c)
  end
end

Suppose that I want to show the red and blue cars. I could do
something like this:
@cars = Car.color(''blue'') + Car.color(''red'')

The problem I''m finding is that now, @cars is an array and I could not
do something like that:
@cars.page(params[:page]).per(10)
@cars.order( ..... )
or any method ActiveRecord implements. The question is: ¿How can I
manage ActiveRecord array/collection for do: + - | &?

Thanks very much.

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Pagination obviously doesn''t works on Array, but ActiveRecord::Relation
set.

You have to rewrite your color selector using ''standard de
facto'' approach:

class Car < ActiveRecord::Base
  scope :colored, lambda { |color| where(:color => color) }
end

Then just call:

Car.colored(%w{red blue}).page ... etc


On 05.06.2011, at 20:11, danimashu wrote:
> Hello, I have a model like this:
> 
> class Car < ActiveRecord::Base
>  def color(c)
>    where("color = ?",c)
>  end
> end
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Should it be:

class Car < ActiveRecord::Base
  def self.color(c)
    ...
  end
end

Allan

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Great Valery! I''ve solved it.

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