The issue has to do with the case statement and the overloaded ===
operator. If you want to query the class for an object, don't use
the .class operator on the case statement.
case joins_for_collection
when String
[ joins_for_collection ]
when Array
puts joins_for_collection.inspect
joins_for_collection
else
puts "HERE: #{joins_for_collection.class}"
[]
end + active_scaffold_habtm_joins
works without the .class. That is how the final fix was made as
well. Just a Ruby annoyance. :)
On Mar 26, 1:42 pm, "Sergio Cambra .:: entreCables - Symbol Servicios
Informáticos S.L. ::." <[email protected]> wrote:
> El Wednesday 25 March 2009 18:56:50 Wes Gamble escribió:
>
>
>
> > Wes Gamble wrote:
> > > Wes Gamble wrote:
> > >> Sergio Cambra .:: entreCables - Symbol Servicios Informáticos S.L. ::.
>
> > >> wrote:
> > >>> El Wednesday 25 March 2009 15:33:14 Wes Gamble escribió:
> > >>>> Sergio Cambra .:: entreCables - Symbol Servicios Informáticos S.L. ::.
>
> > >>>> wrote:
> > >>>>> El Sunday 22 March 2009 08:17:18 Wes Gamble escribió:
>
> > >>>>> I have a fairly complex custom find call that I need to do in some
> > >>>>> instances for an AS index view. conditions_for_collection will only
> > >>>>> handle conditions, correct? Is there any hook so that I can provide
> > >>>>> other find options like :joins or :limit?
>
> > >>>>> You can define an active_scaffold_joins method, like
> > >>>>> active_scaffold_conditions, and you can set the limit in your
> > >>>>> controller AS config:
> > >>>>> config.list.per_page
> > >>>>>http://wiki.github.com/activescaffold/active_scaffold/api-list
>
> > >>>> Sergio,
>
> > >>>> I need to do a join to a HABTM association table - currently I'm doing
> > >>>> it as a subquery via conditions_for_collection, as in:
>
> > >>>> "id IN (SELECT medical_facility_id FROM
> > >>>> medical_facilities_medical_facility_categories WHERE
> > >>>> medical_facility_category_id = #...@medical_facility_category_id})" if
> > >>>> @medical_facility_category_id
>
> > >>>> How would I write the active_scaffold_joins (or looks like I should
> > >>>> use active_scaffold_habtm_joins) to handle this case?
>
> > >>> Sorry, I was wrong.
> > >>> conditions_for_collection is for set :conditions option of rails find.
> > >>> joins_for_collection is for set :joins option of ActiveRecord's find
> > >>> method.
>
> > >>> Do you know build the sql with ActiveRecord's find method?
> > >>> MedicalFacility.find :all, :joins => :medical_facility_categories,
> > >>> :conditions => ['medical_facility_categories.id = ?',
> > >>> @medical_facility_category_id]
>
> > >>> So you define these methods:
> > >>> def conditions_for_collection
> > >>> ['medical_facility_categories.id = ?', @medical_facility_category_id]
> > >>> end
>
> > >>> def joins_for_collection
> > >>> [:medical_facility_categories]
> > >>> end
>
> > >> This is weird. The call to "joins_for_finder" (which calls
> > >> joins_for_collection) is failing. I've puts'ed it to death to see
> > >> what's happening. Even though the class of my "joins_for_collection"
> > >> method is reported as Array, Array is NOT matching on the case
> > >> statement, and it is dropping into the else. WTF?
>
> > >> def joins_for_finder
> > >> puts joins_for_collection.class
>
> > >> case joins_for_collection.class
> > >> when String
> > >> [ joins_for_collection ]
> > >> when Array
> > >> puts joins_for_collection.inspect
> > >> joins_for_collection
> > >> else
> > >> puts "HERE: #{joins_for_collection.class}"
> > >> []
> > >> end + active_scaffold_habtm_joins
> > >> end
>
> > >> Output:
> > >> Array
> > >> HERE: Array
>
> > > Sure enough, joins_for_collection.class === Array returns false,
> > > although joins_for_collection.class == Array returns true.
>
> > > This looks like a bug to me, and now I wonder if joins_for_collection
> > > ever worked. Same behavior occurs if a String is returned from
> > > joins_for_collection.
>
> > This works:
>
> > def joins_for_finder
> > case joins_for_collection.class.to_s
> > when 'String'
> > [ joins_for_collection ]
> > when 'Array'
> > joins_for_collection
> > else
> > []
> > end + active_scaffold_habtm_joins
> > end
>
> > It makes sense that the "===" doesn't work between classes since it is
> > defined thusly:
>
> > "Ruby classes are instances of class Class, which defines === to test if
> > the argument
> > is an instance of the class or one of its superclasses."
>
> > Since a class is not an instance of anything, === will never work in
> > this case.
>
> > I'm on the 2.1 branch - maybe this has been fixed in edge AS?
>
> Fixed in rails 2.1, 2.2 and edge
>
> --
> Sergio Cambra .:: entreCables S.L. ::.
> Nicolás Guillén 6, locales 2 y 3. 50.018 Zaragoza
> T) 902 021 404 F) 976 52 98 07 E) [email protected]
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