Rails - Oct 2006 - Putting filter conditions on ActiveRecord::Base object?

All,

I would like to be able to have an AR::Base descendant that only deals 
with a subset of rows in a table based on some filtering criterion.

For example, let''s say I make an object "job" but I only want
to select
rows from the "jobs" table where the "status" column is not
equal to
"X".

Is there a way to apply the "status != ''X''"
condition (similar to a
condition on a find or a has_many declaration) to the object or do I 
have to handle this explicitly in whatever find() calls I make on the 
object?

Obviously, one way to go is to just make a view that does my filtering 
for me.

Thanks,
Wes

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Can I use an after_find callback to cull out the rows that I don''t
want?

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Wes Gamble wrote:
> Can I use an after_find callback to cull out the rows that I don''t
want?
>
> --
> Posted via http://www.ruby-forum.com/.
Take a look for with_scope...

_Kevin


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Kevin,

I''ve seen with_scope.  This is limited to a particular block correct? 
What I''m hoping for is some kind of "default" scope that will
always be
applied to find calls.

Wes


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This looks promising.

http://roman2k.free.fr/rails/meantime_filter/0.1.0/rdoc/

Anyone want to encourage/discourage me from using it?

Wes


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Look on http://www.agilewebdevelopment.com/plugins/global_scope and you 
will find exactly what you need.

Dimitrij

PS: Pease feel free to participate in the following discussion: 
http://www.ruby-forum.com/topic/85781


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Dim wrote:
> Look on http://www.agilewebdevelopment.com/plugins/global_scope and you 
> will find exactly what you need.
> 
> Dimitrij
> 
> PS: Pease feel free to participate in the following discussion: 
> http://www.ruby-forum.com/topic/85781
Dimitri -

This looks promising, but it is unclear to me how to use it from the 
documentation.  There''s no example of how to declare the plugins use in
a controller.

Wes

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Dimitri,

It looks like your plugin is for a plugin author to use to ensure that 
they don''t cause method invocation errors due to custom scoping rules.

Maybe I''m misunderstanding - I just want to scope my controller methods
and it''s unclear how I take advantage of global_scope to do that.

WG


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Use acts_as_view (Google for it) - by maiha, author of scoping in the
first place.


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Wow, there are so many different solutions to this - I wonder if 
controller level scoping will be added in some way to 1.2?


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Wes Gamble wrote:
> Dimitri,
> 
> It looks like your plugin is for a plugin author to use to ensure that 
> they don''t cause method invocation errors due to custom scoping
rules.
> 
Yes, that was my original reason.
> Maybe I''m misunderstanding - I just want to scope my controller
methods
> and it''s unclear how I take advantage of global_scope to do that.
> 
If you want to add scope to some controller methods, global scopes are 
not the right tool. Why not doing something like that:

def some_action_that_should_use_my_scope(...)
  with_my_scope do
    ...
  end
end

def some_other_action_that_should_use_my_scope(...)
  with_my_scope do
    ...
  end
end

protected
  def with_my_scope(&block)
   with_scope(:find=>{...}, :merge, &block)
  end

Dimitrij

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with_scope is going to be your best bet here.  Apply the KISS rule
liberally.

Erik


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with_scope is going to be your best bet here.  Apply the KISS rule
liberally.

Erik


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Actually, let me illustrate with a section of my own code:

(instance method of a Group model)
  def members
    User.with_scope :find => {:conditions => "#{User.table_name}.id
!#{self.leader.id}"} do
      users.find_all
    end
  end


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