Hi ! There must be something I don''t understand clearly in acts_as_list
I have a list of gallery entries (images + text), model is GalleryEntry.
I have a field in_exhibition (boolean)
I want the list to be sorted with a scope on in_exhibition : from 1 to N
for every record having in_exhibition = false and 1 to N for every
record having in_exhibition = true
When I use acts_as_list :scope => "in_exhibition =
#{in_exhibition}"
I get a runtime error :
undefined local variable or method `in_exhibition'' for
GalleryEntry:Class
Is it possible to use acts_as_list that way ??
If not what is the solution ? Creating another model GalleryEntryType
and :
GalleryEntry
belongs_to :gallery_entry_type
acts_as_list :scope => :gallery_entry_type
??
Any help appreciated I don''t know what''s wrong or right....
thank you
--
Posted via http://www.ruby-forum.com/.
Just do acts_as_list :scope => :in_exhibition On 5/26/06, Nuno <nomail@novalidatall991.com> wrote:> > Hi ! There must be something I don''t understand clearly in acts_as_list > > I have a list of gallery entries (images + text), model is GalleryEntry. > I have a field in_exhibition (boolean) > > I want the list to be sorted with a scope on in_exhibition : from 1 to N > for every record having in_exhibition = false and 1 to N for every > record having in_exhibition = true > > When I use acts_as_list :scope => "in_exhibition = #{in_exhibition}" > > I get a runtime error : > undefined local variable or method `in_exhibition'' for > GalleryEntry:Class > > Is it possible to use acts_as_list that way ?? > > If not what is the solution ? Creating another model GalleryEntryType > and : > GalleryEntry > belongs_to :gallery_entry_type > acts_as_list :scope => :gallery_entry_type > > ?? > > Any help appreciated I don''t know what''s wrong or right.... thank you > > -- > Posted via http://www.ruby-forum.com/. > _______________________________________________ > Rails mailing list > Rails@lists.rubyonrails.org > http://lists.rubyonrails.org/mailman/listinfo/rails >-------------- next part -------------- An HTML attachment was scrubbed... URL: http://wrath.rubyonrails.org/pipermail/rails/attachments/20060526/9a140455/attachment.html
Paul Barry wrote:> Just do acts_as_list :scope => :in_exhibitionNo, in that case RoR except a in_exhibition_id key field which handle the relation with a parent model. -- Posted via http://www.ruby-forum.com/.
Nuno wrote:> > exceptSorry, I mean expect ! -- Posted via http://www.ruby-forum.com/.
On 5/26/06, Nuno <nomail@novalidatall991.com> wrote:> Hi ! There must be something I don''t understand clearly in acts_as_list > > I have a list of gallery entries (images + text), model is GalleryEntry. > I have a field in_exhibition (boolean) > > I want the list to be sorted with a scope on in_exhibition : from 1 to N > for every record having in_exhibition = false and 1 to N for every > record having in_exhibition = true > > When I use acts_as_list :scope => "in_exhibition = #{in_exhibition}" > > I get a runtime error : > undefined local variable or method `in_exhibition'' for > GalleryEntry:Class > > Is it possible to use acts_as_list that way ?? > > If not what is the solution ? Creating another model GalleryEntryType > and : > GalleryEntry > belongs_to :gallery_entry_type > acts_as_list :scope => :gallery_entry_type >You need to surround your ''scope'' clause with single-quotes, rather than double-quotes. It''s a little funny, because you don''t want Ruby to evaluate #{in_exhibition} when it is first seen in the class body. You only want that to happen when the queries execute. acts_as_list :scope => ''in_exhibition = #{in_exhibition}'' should work.
Wilson Bilkovich wrote:> > acts_as_list :scope => ''in_exhibition = #{in_exhibition}'' > should work.It does ! Thanks ! Please, could you explain a little what''s happening behind the scene ? What is is the difference between the '''' and the "" version ? Thanks -- Posted via http://www.ruby-forum.com/.
On 5/27/06, Nuno <nomail@novalidatall991.com> wrote:> Wilson Bilkovich wrote: > > > > acts_as_list :scope => ''in_exhibition = #{in_exhibition}'' > > should work. > > It does ! Thanks ! > > Please, could you explain a little what''s happening behind the scene ? > What is is the difference between the '''' and the "" version ? >When Ruby sees a double-quoted string during execution, it immediately tries to ''interpolate'' it. In this case, that would mean looking for a local variable or method called in_exhibition, and inserting in_exhibition.to_s into the string. However, acts_as_list is a class method of ActiveRecord, and in_exhibition is an INSTANCE method. When acts_as_list is executed, in_exhibition is out of scope, and can''t be found. This makes sense, because what you''re saying is that the whole class acts_as_list, not just one instance of it. The single-quote trick is a workaround for that, because it lets acts_as_list wait until later to hunt up the value of in_exhibition. Fairly weird, and personally I''d prefer the :scope option to work the same way as "validates_uniqueness_of" e.g. acts_as_list :scope => [:some_column, :some_other_column] Until someone writes a plugin for that, we''re stuck with the funny single-quoted string. You should also be able to write the above as: acts_as_list :scope => %q[in_exhibition = #{in_exhibition}] ..if that ever makes it easier.