Hi I''m running the following test in rails and I can''t seem to
figure
out its behaviour. The @institution object has an array of LicenseType
objects, license_types() starts of as an array of 2. Basically, I''m
removing one of the LicenseType objects from the license_types array,
saving @institution and then confirming that its size is now 1 instead
of 2. here''s what I don''t get. If I remove the license type
with the
''delete_if'' block, then call save(), there are still two
license_types
in the Array. However, if I remove the LicenseType with the ''delete(
ltype )'' method, then call save() there is 1 LicenseType in the array.
I
would think that both of these methods should have the same result, but
only the latter is passing the test.
Any ideas?
# failing test
def test_update()
assert_equal(''The Mathworks, Inc.'', @institution.name())
@institution.name = ''Mathworks''
assert(''Mathworks'', @institution.name())
assert_kind_of(Array, @institution.license_types())
assert_equal(2, @institution.license_types().size())
ltype = @institution.license_types().detect() { |lt| lt.name ==
''group'' }
assert_equal(''group'', ltype.name())
@institution.license_types().delete_if { |lt| lt.name() ==
''group'' }
assert_equal(1, @institution.license_types().size())
assert(@institution.save())
@institution.reload()
assert_equal(''Mathworks'', @institution.name())
// test fails here as license_types().size() == 2
assert_equal(1, @institution.license_types().size())
end
# passing test
def test_update()
assert_equal(''The Mathworks, Inc.'', @institution.name())
@institution.name = ''Mathworks''
assert(''Mathworks'', @institution.name())
assert_kind_of(Array, @institution.license_types())
assert_equal(2, @institution.license_types().size())
ltype = @institution.license_types().detect() { |lt| lt.name ==
''group'' }
assert_equal(''group'', ltype.name())
@institution.license_types().delete(ltype)
assert_equal(1, @institution.license_types().size())
assert(@institution.save())
@institution.reload()
assert_equal(''Mathworks'', @institution.name())
assert_equal(1, @institution.license_types().size())
end
--
Posted via http://www.ruby-forum.com/.
delete is an association method, therefore it deletes the associated record from the database when it is deleted from the collection. delete_if is not an association method, therefore the object will only be removed from the collection, but the record is not deleted from the database. http://api.rubyonrails.com/classes/ActiveRecord/Associations/ClassMethods.html On 11/20/05, Steven <runner-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> wrote:> > Hi I''m running the following test in rails and I can''t seem to figure > out its behaviour. The @institution object has an array of LicenseType > objects, license_types() starts of as an array of 2. Basically, I''m > removing one of the LicenseType objects from the license_types array, > saving @institution and then confirming that its size is now 1 instead > of 2. here''s what I don''t get. If I remove the license type with the > ''delete_if'' block, then call save(), there are still two license_types > in the Array. However, if I remove the LicenseType with the ''delete( > ltype )'' method, then call save() there is 1 LicenseType in the array. I > would think that both of these methods should have the same result, but > only the latter is passing the test. > > Any ideas? > > # failing test > def test_update() > assert_equal(''The Mathworks, Inc.'', @institution.name()) > @institution.name <http://institution.name> = ''Mathworks'' > assert(''Mathworks'', @institution.name()) > > assert_kind_of(Array, @institution.license_types()) > assert_equal(2, @institution.license_types().size()) > > ltype = @institution.license_types().detect() { |lt| lt.name<http://lt.name>=> ''group'' } > assert_equal(''group'', ltype.name()) > > @institution.license_types().delete_if { |lt| lt.name() == ''group'' } > assert_equal(1, @institution.license_types().size()) > > assert(@institution.save()) > @institution.reload() > > assert_equal(''Mathworks'', @institution.name()) > // test fails here as license_types().size() == 2 > assert_equal(1, @institution.license_types().size()) > > end > > # passing test > def test_update() > assert_equal(''The Mathworks, Inc.'', @institution.name()) > @institution.name <http://institution.name> = ''Mathworks'' > assert(''Mathworks'', @institution.name()) > > assert_kind_of(Array, @institution.license_types()) > assert_equal(2, @institution.license_types().size()) > > ltype = @institution.license_types().detect() { |lt| lt.name<http://lt.name>=> ''group'' } > assert_equal(''group'', ltype.name()) > > @institution.license_types().delete(ltype) > assert_equal(1, @institution.license_types().size()) > > assert(@institution.save()) > @institution.reload() > > assert_equal(''Mathworks'', @institution.name()) > assert_equal(1, @institution.license_types().size()) > > end > > -- > Posted via http://www.ruby-forum.com/. > _______________________________________________ > Rails mailing list > Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org > http://lists.rubyonrails.org/mailman/listinfo/rails >_______________________________________________ Rails mailing list Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org http://lists.rubyonrails.org/mailman/listinfo/rails
Hi Christopher, Thanks for your reply! Ok, that makes sense, I foolishly assumed that I was calling the delete() method from the Array object. If you don''t mind, I''d like to ask another question. If the method ''license_types()'' returns an object of Array--which my test confirms--and I then call something like ''license_types().delete()'' why isn''t the delete() method of Array being used? In fact, the module ENUM which is mixed into class Array has a method named ''find()'' just like ActiveRecord. In my test I had to use the alias method for find() in my block.....detect()--because the ActiveRecord find() kept getting called. How does one ensure that the appropriate method gets called? Thanks, Steven christopher.k.hall wrote:> delete is an association method, therefore it deletes the associated > record > from the database when it is deleted from the collection. delete_if is > not > an association method, therefore the object will only be removed from > the > collection, but the record is not deleted from the database. > > http://api.rubyonrails.com/classes/ActiveRecord/Associations/ClassMethods.html-- Posted via http://www.ruby-forum.com/.
those methods are overridden...ActiveRecord has replaced them with its own implementations. On 11/20/05, Steven <runner-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> wrote:> > > Hi Christopher, > > Thanks for your reply! Ok, that makes sense, I foolishly assumed that I > was calling the delete() method from the Array object. > > If you don''t mind, I''d like to ask another question. If the method > ''license_types()'' returns an object of Array--which my test > confirms--and I then call something like ''license_types().delete()'' why > isn''t the delete() method of Array being used? > > In fact, the module ENUM which is mixed into class Array has a method > named ''find()'' just like ActiveRecord. In my test I had to use the > alias method for find() in my block.....detect()--because the > ActiveRecord find() kept getting called. How does one ensure that the > appropriate method gets called? > > Thanks, > Steven > > > > christopher.k.hall wrote: > > delete is an association method, therefore it deletes the associated > > record > > from the database when it is deleted from the collection. delete_if is > > not > > an association method, therefore the object will only be removed from > > the > > collection, but the record is not deleted from the database. > > > > > http://api.rubyonrails.com/classes/ActiveRecord/Associations/ClassMethods.html > > > -- > Posted via http://www.ruby-forum.com/. > _______________________________________________ > Rails mailing list > Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org > http://lists.rubyonrails.org/mailman/listinfo/rails >_______________________________________________ Rails mailing list Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org http://lists.rubyonrails.org/mailman/listinfo/rails
You can explicitly get the array version of delete by doing this:> ''license_types.to_a.deleteCheers- -Ezra On Nov 20, 2005, at 4:47 PM, Chris Hall wrote:> those methods are overridden...ActiveRecord has replaced them with > its own implementations. > > On 11/20/05, Steven < runner-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> wrote: > > Hi Christopher, > > Thanks for your reply! Ok, that makes sense, I foolishly assumed > that I > was calling the delete() method from the Array object. > > If you don''t mind, I''d like to ask another question. If the method > ''license_types()'' returns an object of Array--which my test > confirms--and I then call something like ''license_types().delete()'' > why > isn''t the delete() method of Array being used? > > In fact, the module ENUM which is mixed into class Array has a method > named ''find()'' just like ActiveRecord. In my test I had to use the > alias method for find() in my block.....detect()--because the > ActiveRecord find() kept getting called. How does one ensure that the > appropriate method gets called? > > Thanks, > Steven > > > > christopher.k.hall wrote: > > delete is an association method, therefore it deletes the associated > > record > > from the database when it is deleted from the collection. > delete_if is > > not > > an association method, therefore the object will only be removed > from > > the > > collection, but the record is not deleted from the database. > > > > http://api.rubyonrails.com/classes/ActiveRecord/Associations/ > ClassMethods.html > > > -- > Posted via http://www.ruby-forum.com/. > _______________________________________________ > Rails mailing list > Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org > http://lists.rubyonrails.org/mailman/listinfo/rails > > _______________________________________________ > Rails mailing list > Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org > http://lists.rubyonrails.org/mailman/listinfo/rails-Ezra Zygmuntowicz WebMaster Yakima Herald-Republic Newspaper ezra-gdxLOakOTQ9oetBuM9ipNAC/G2K4zDHf@public.gmane.org 509-577-7732 _______________________________________________ Rails mailing list Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org http://lists.rubyonrails.org/mailman/listinfo/rails
Thanks Ezra and Christopher, So the container that ActiveRecord uses to store objects on the ''many'' side of a relationship, is not a normal Array I take it. Do either of you guys know if rails has this info in the API docs.....I can''t find it. I checked out a copy of rails and I now see that ActiveRecord uses the AssociationCollection class. Thanks Again! Steven ezra wrote:> You can explicitly get the array version of delete by doing this: > >> ''license_types.to_a.delete > > > Cheers- > > -Ezra > > On Nov 20, 2005, at 4:47 PM, Chris Hall wrote: > >> >> appropriate method gets called? >> delete_if is >> -- >> Posted via http://www.ruby-forum.com/. >> _______________________________________________ >> Rails mailing list >> Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org >> http://lists.rubyonrails.org/mailman/listinfo/rails >> >> _______________________________________________ >> Rails mailing list >> Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org >> http://lists.rubyonrails.org/mailman/listinfo/rails > > -Ezra Zygmuntowicz > WebMaster > Yakima Herald-Republic Newspaper > ezra-gdxLOakOTQ9oetBuM9ipNAC/G2K4zDHf@public.gmane.org > 509-577-7732-- Posted via http://www.ruby-forum.com/.
Thanks Ezra and Christopher, So the container that ActiveRecord uses to store objects on the ''many'' side of a relationship, is not a normal Array I take it. Do either of you guys know if rails has this info in the API docs.....I can''t find it. I checked out a copy of rails and I now see that ActiveRecord uses the AssociationCollection class. Thanks Again! Steven -- Posted via http://www.ruby-forum.com/.