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bramski-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2007-May-09 20:28 UTC

How to use Single Table Inheritance with Modules

So, I have a table...

events
==========id int
type varchar(255)
data text

Which I''m using to log some simple system events...

class Event < ActiveRecord::Base
end

I''d like to file quite a lot of events in here, and load them later
into a general parsing and display system for the events.  However,
what I''d really like to do is:

class Component::FooBarEvent < ActiveRecord::Base
end

new_event = Component::FooBarEvent.create :data => {"msg"
=>"Hello
world"}
assert( new_event == Event.find_by_id(new_event.id) )

instead what I get is...
LoadError: Expected /home/bramski/source/trunk/config/../app/models/
events/component_events/foo_bar_event.rb to define FooBarEvent

If I look in the SQL I see...
SQL (0.000269)   INSERT INTO events ( `type`,  `data`,
`eventable1_type`, `foreign_id`) VALUES(''TestEvent'', 
''--- \nmsg:
Hello world\n'')

Now.. I should never see the above LoadError for the missing constant
as Component::FooBarEvent is already defined.  What is confusing here
is, why is rails putting in the unqualified constant for the object
(FooBarEvent) as opposed to the fully qualified constant name
(Component::FooBarEvent).

Is there a way to get rails to store and load Component::FooBarEvent
as the type, rather than just FooBarEvent?


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Yuri Leikind

2007-May-10 11:12 UTC

head link

Re: How to use Single Table Inheritance with Modules

Hey,

How about either

renaming Component::FooBarEvent to ComponentEvents::FooBarEvent

or

renaming the directory component_events to component  ?

Cheers,
Yuri


On 5/9/07, bramski-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
<bramski-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:>
> So, I have a table...
>
> events
> ==========> id int
> type varchar(255)
> data text
>
> Which I''m using to log some simple system events...
>
> class Event < ActiveRecord::Base
> end
>
> I''d like to file quite a lot of events in here, and load them
later
> into a general parsing and display system for the events.  However,
> what I''d really like to do is:
>
> class Component::FooBarEvent < ActiveRecord::Base
> end
>
> new_event = Component::FooBarEvent.create :data => {"msg"
=>"Hello
> world"}
> assert( new_event == Event.find_by_id(new_event.id) )
>
> instead what I get is...
> LoadError: Expected /home/bramski/source/trunk/config/../app/models/
> events/component_events/foo_bar_event.rb to define FooBarEvent
>
> If I look in the SQL I see...
> SQL (0.000269)   INSERT INTO events ( `type`,  `data`,
> `eventable1_type`, `foreign_id`) VALUES(''TestEvent'', 
''--- \nmsg:
> Hello world\n'')
>
> Now.. I should never see the above LoadError for the missing constant
> as Component::FooBarEvent is already defined.  What is confusing here
> is, why is rails putting in the unqualified constant for the object
> (FooBarEvent) as opposed to the fully qualified constant name
> (Component::FooBarEvent).
>
> Is there a way to get rails to store and load Component::FooBarEvent
> as the type, rather than just FooBarEvent?
>
>
> >
>

-- 
Best regards,
Yuri Leikind

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bramski-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org

2007-May-11 00:17 UTC

head link

Re: How to use Single Table Inheritance with Modules

That doesn''t really do anything, I still don''t get
ActiveRecord
storing as "type" => "ComponentEvents::FooBarEvent", I
get "type" =>
"FooBarEvent", and rails is unable to locate the class
"Object::FooBarEvent" because it''s
"ComponentEvents::FooBarEvent".

On May 10, 4:12 am, "Yuri Leikind"
<yuri.leik...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:> Hey,
>
> How about either
>
> renaming Component::FooBarEvent to ComponentEvents::FooBarEvent
>
> or
>
> renaming the directory component_events to component  ?
>
> Cheers,
> Yuri
>
> On 5/9/07, bram...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
<bram...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>
>
>
>
> > So, I have a table...
>
> > events
> > ==========> > id int
> > type varchar(255)
> > data text
>
> > Which I''m using to log some simple system events...
>
> > class Event < ActiveRecord::Base
> > end
>
> > I''d like to file quite a lot of events in here, and load them
later
> > into a general parsing and display system for the events.  However,
> > what I''d really like to do is:
>
> > class Component::FooBarEvent < ActiveRecord::Base
> > end
>
> > new_event = Component::FooBarEvent.create :data => {"msg"
=>"Hello
> > world"}
> > assert( new_event == Event.find_by_id(new_event.id) )
>
> > instead what I get is...
> > LoadError: Expected /home/bramski/source/trunk/config/../app/models/
> > events/component_events/foo_bar_event.rb to define FooBarEvent
>
> > If I look in the SQL I see...
> > SQL (0.000269)   INSERT INTO events ( `type`,  `data`,
> > `eventable1_type`, `foreign_id`) VALUES(''TestEvent'',
''--- \nmsg:
> > Hello world\n'')
>
> > Now.. I should never see the above LoadError for the missing constant
> > as Component::FooBarEvent is already defined.  What is confusing here
> > is, why is rails putting in the unqualified constant for the object
> > (FooBarEvent) as opposed to the fully qualified constant name
> > (Component::FooBarEvent).
>
> > Is there a way to get rails to store and load Component::FooBarEvent
> > as the type, rather than just FooBarEvent?
>
> --
> Best regards,
> Yuri Leikind

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Rails - May 2007 - How to use Single Table Inheritance with Modules

How to use Single Table Inheritance with Modules

Re: How to use Single Table Inheritance with Modules

Re: How to use Single Table Inheritance with Modules