Rails - Jan 2008 - half way from re-building an object .... just a little bit of brain..

I found that it''s easy w Rails 2.0 to deserialize !

data = XmlSimple.xml_in(result)
v = Hash.from_xml(result).values.first

=> {"membership_at"=>"2007-03-28T21:25:31Z",
"display_name"=>"chane850",
"first_name"=>nil, "last_name"=>nil}

so now how can I build an ActiveRecord-like object (don''t want to
create a table)

Membership class  with these attributes ?

@membership = Membership.new.build( v )  ?  doesn'' t work

any clue ?

thanks


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Create this class, called tableless.rb  in your app/models folder

# Table-less model used for any object that needs validation or for
# any web form that does not need a database.
# Idea and concept from Rick Olson
class Tableless < ActiveRecord::Base
  def self.columns()
    @columns ||= [];
  end

  def self.column(name, sql_type = nil, default = nil, null = true)
    columns << ActiveRecord::ConnectionAdapters::Column.new(name.to_s,
default,
    sql_type.to_s, null)
  end

  # override the save method to prevent exceptions.
  def save(validate = true)
    validate ? valid? : true
  end


end


Now just create a new class called Membership (app/models/membership.rb)

class Membership < Tableless
   column :display_name, :string
   column :first_name, :string
   column :last_name, :string
   column :membership_at, :datetime

   validates_presence_of :display_name, :first_name, :last_name,
membership_at


end



And then get ready to rock.

m = Membership.new(hash_from_xml)
if m.valid?
   # do stuff
else
   # do other failure stuff
end

Throw your other membership business rules in the membership.rb class too.

I use this technique for contact forms, etc that don''t need backends.




On Jan 8, 2008 12:51 PM, Erwin <yves_dufour-ee4meeAH724@public.gmane.org>
wrote:
>
> I found that it''s easy w Rails 2.0 to deserialize !
>
> data = XmlSimple.xml_in(result)
> v = Hash.from_xml(result).values.first
>
> => {"membership_at"=>"2007-03-28T21:25:31Z",
> "display_name"=>"chane850",
"first_name"=>nil, "last_name"=>nil}
>
> so now how can I build an ActiveRecord-like object (don''t want to
> create a table)
>
> Membership class  with these attributes ?
>
> @membership = Membership.new.build( v )  ?  doesn'' t work
>
> any clue ?
>
> thanks
>
>
> >
>
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