Rails - Mar 2007 - Created_on and updated_on in a non-ActiveRecord model

Hi you all,

I have a model simulating an ActiveRecord model, according to the tips
stated in [1]. It is simulated because even though I am gonna save the
attributes in a file, not in a DB, I still want the validations made by
ActiveRecord::Base (see code below).

Well, the thing is that I also want the behaviour of the created_on and
updated_on columns, that get modified automatically before saving.
The problem is that I have my own "save" method and it does not work
(remember this is not a real ActiveRecord model). I''ve tried to set the
before_create and before_updated methods but they does not work (see
code below).

So… is there any way to do it automatically?

Thanks.

*******
[1]
http://wiki.rubyonrails.org/rails/pages/HowToUseValidationsWithoutExtendingActiveRecord
, Alternative 2.

CODE:

class PageMetadata < 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

column :abstract, :string
column :title, :string
column :created_on, :datetime
column :updated_on, :datetime

validates_presence_of :abstract
validates_length_of :abstract, :within => 1..80

def save(identifier)
  if self.valid?
    #I set my stuff in a file……….
    true
  else
    false
  end
end
def before_create
  self.created_on ||=Time.now
end
def before_update
  self.updated_on ||=Time.now
end
end

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

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---

Can you just use callbacks? Something like:


class PageMetadata < ActiveRecord::Base

  before_create :set_created_on
  before_update :set_updated_on

  private

    def set_created_on
      self.created_on ||= Time.now
    end

    def set_updated_on
      self.updated_on ||= Time.now
    end

end


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

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---

No, I can''t do that.

It''s like the callbacks didn''t work cause I am not calling to
a normal
save() method, but a save(identifier) method...
:(


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

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---

On Mar 17, 12:27 pm, Damaris Fuentes <rails-mailing-l...@andreas-
s.net> wrote:
> No, I can''t do that.
>
> It''s like the callbacks didn''t work cause I am not
calling to a normal
> save() method, but a save(identifier) method...
> :(
>
You are overwriting the ''save'' method entirely, which
overwrites the
original behavior of save. The way ActiveRecord works the save method
will check to see if you are saving a new record or updating an
original, by calling "create_or_update".

If you are creating a new record the ''create'' method is
called. This
method is actually aliased to ''create_with_callbacks'', which
invokes
the callback stack for before_create, etc.

You can specify the callbacks you want to use in the following
example:

def save(identifier)
  if valid?
     callback( :before_create )
     # ... write to disk
     callback( :after_create )
  end
  #... other stuff....
end

OR you can overwrite the create/callback chain:

class YourModel
  def create
      # YOUR CREATE FUNCTIONALITY HERE
  end

  alias_method_chain :create, :callbacks
end

Now when you call save, your "create" method will be used over
ActiveRecord''s. Now you don''t even have to overrirde save,
because you
can put your "save" logic in the create method. Likewise
you''d want to
do the same for the "update" and "destroy" methods as well.

Zach
http://www.continuousthinking.com




--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---

Um....ok...I will try this then... So this is the same reason why I also
have to valid inside my new save() method? Cause the validations and the
errors added has to be also managed by myself :(

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

--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups
"Ruby on Rails: Talk" group.
To post to this group, send email to
rubyonrails-talk-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
To unsubscribe from this group, send email to
rubyonrails-talk-unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---