# Partials views and instance variables go nil **URL:** \ **Category:** Rails\ **Created:** [June 14, 2009, 7:58am UTC](https://www.ruby-forum.com/t/partials-views-and-instance-variables-go-nil/170219 "2009-06-14T07:58:14Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![steux](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d26b3c/32.png) [@steux](https://www.ruby-forum.com/u/steux)\ **Post date:** [June 14, 2009, 7:58am UTC](https://www.ruby-forum.com/t/partials-views-and-instance-variables-go-nil/170219/1 "2009-06-14T07:58:14Z")
Hi everyone! Model: [http://pastie.org/511290](http://pastie.org/511290) Controller: [http://pastie.org/511285](http://pastie.org/511285) View new: [http://pastie.org/511286](http://pastie.org/511286) View \_form: [http://pastie.org/511284](http://pastie.org/511284) When I hit submit button there’s an error for usuarios(users in portuguese) instance. It does not seems to save usuarios even though it seems to be posted by the form. Error: [http://pastie.org/511292](http://pastie.org/511292) Need some help here guys plz ---
**Author:** ![steux](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d26b3c/32.png) [@steux](https://www.ruby-forum.com/u/steux)\ **Post date:** [June 14, 2009, 12:12pm UTC](https://www.ruby-forum.com/t/partials-views-and-instance-variables-go-nil/170219/2 "2009-06-14T12:12:36Z")
On Jun 14, 6:58 am, Bruno S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Error:[http://pastie.org/511292](http://pastie.org/511292) > Well the error happens because a validation fails and so it rerenders > the form, however your create action doesn’t setup @usuarios and so > the bit where you call collection\_select fails. If you look at your parameters although the id is being submitted, it’s not being submitted in the right place in your params hash: you’ve got :usario =\> {:id =\> ‘6’}, whereas what you want is :venda =\> {:usario\_id =\> ‘6’, … } This is because of how you are using collection\_select: you’re telling it that you are editing the id property of @usuario, but you’re not: you’re editing the usario\_id property of @venda. Fix that and it should work (why not call collection\_select on the form builder object ?) Fred ---
**Author:** ![steux](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d26b3c/32.png) [@steux](https://www.ruby-forum.com/u/steux)\ **Post date:** [June 14, 2009, 12:12pm UTC](https://www.ruby-forum.com/t/partials-views-and-instance-variables-go-nil/170219/3 "2009-06-14T12:12:37Z")
@usuarios is nil when you post the forms and there are validation errors (you’re not reloading them a the create action), here’s how to solve it: \<%=collection\_select(:usuario, :id, Usuario.all, :id, :nome\_completo)%\> - Maurício Linhares [http://codeshooter.wordpress.com/](http://codeshooter.wordpress.com/) | [http://twitter.com/mauriciojr](http://twitter.com/mauriciojr) On Sun, Jun 14, 2009 at 2:58 AM, Bruno ---
**Author:** ![steux](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d26b3c/32.png) [@steux](https://www.ruby-forum.com/u/steux)\ **Post date:** [June 14, 2009, 3:57pm UTC](https://www.ruby-forum.com/t/partials-views-and-instance-variables-go-nil/170219/4 "2009-06-14T15:57:40Z")
thanks! I got it working like this: [http://disciplinas.dcc.ufba.br/svn/MATA76/Trabalho20091/equipe13/trunk/lac/app/views/vendas/\_form.html.erb?view=log](http://disciplinas.dcc.ufba.br/svn/MATA76/Trabalho20091/equipe13/trunk/lac/app/views/vendas/_form.html.erb?view=log) The problem is with nested models through ajax. When submit button is hitted, it claims that I didn’t choose a credit card(cartao\_de\_credito) for the payment(pagamento). How come? [http://disciplinas.dcc.ufba.br/svn/MATA76/Trabalho20091/equipe13/trunk/lac/app/views/vendas/\_pagamento.html.erb?view=log](http://disciplinas.dcc.ufba.br/svn/MATA76/Trabalho20091/equipe13/trunk/lac/app/views/vendas/_pagamento.html.erb?view=log) you can browse all the code through svn pages ---
**Author:** ![steux](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d26b3c/32.png) [@steux](https://www.ruby-forum.com/u/steux)\ **Post date:** [June 15, 2009, 2:19am UTC](https://www.ruby-forum.com/t/partials-views-and-instance-variables-go-nil/170219/5 "2009-06-15T02:19:47Z")
Nice! It worked. Last thing is that I tried using select\_tag in many ways, but none worked. By lines 9-12 in [http://disciplinas.dcc.ufba.br/svn/MATA76/Trabalho20091/equipe13/trunk/lac/app/views/vendas/\_pagamento.html.erb?view=log](http://disciplinas.dcc.ufba.br/svn/MATA76/Trabalho20091/equipe13/trunk/lac/app/views/vendas/_pagamento.html.erb?view=log) I just want a normal select tag with those 4 values. Frederick C. wrote: > On Jun 14, 2:57�pm, Bruno S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > wrote: > > > thanks! > > I got it working like this:[http://disciplinas.dcc.ufba.br/svn/MATA76/Trabalho20091/equipe13/trun](http://disciplinas.dcc.ufba.br/svn/MATA76/Trabalho20091/equipe13/trun)… > > > > The problem is with nested models through ajax. When submit button is > > hitted, it claims that I didn’t choose a credit card(cartao\_de\_credito) > > for the payment(pagamento). How come?[http://disciplinas.dcc.ufba.br/svn/MATA76/Trabalho20091/equipe13/trun](http://disciplinas.dcc.ufba.br/svn/MATA76/Trabalho20091/equipe13/trun)… > > You’re using collection\_select wrong. EIther you use the form\_builder > version and do > > f.collection\_select :attribute\_name, … > > or you use the old version: > > collection\_select :ivar\_name, :attribute\_name, … > > but not some mix of the two as you have there > > Fred ---
**Author:** ![steux](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/s/d26b3c/32.png) [@steux](https://www.ruby-forum.com/u/steux)\ **Post date:** [June 14, 2009, 4:43pm UTC](https://www.ruby-forum.com/t/partials-views-and-instance-variables-go-nil/170219/6 "2009-06-14T16:43:55Z")
On Jun 14, 2:57 pm, Bruno S. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > thanks! > I got it working like this:[http://disciplinas.dcc.ufba.br/svn/MATA76/Trabalho20091/equipe13/trun](http://disciplinas.dcc.ufba.br/svn/MATA76/Trabalho20091/equipe13/trun)… > > The problem is with nested models through ajax. When submit button is > hitted, it claims that I didn’t choose a credit card(cartao\_de\_credito) > for the payment(pagamento). How come?[http://disciplinas.dcc.ufba.br/svn/MATA76/Trabalho20091/equipe13/trun](http://disciplinas.dcc.ufba.br/svn/MATA76/Trabalho20091/equipe13/trun)… You’re using collection\_select wrong. EIther you use the form\_builder version and do f.collection\_select :attribute\_name, … or you use the old version: collection\_select :ivar\_name, :attribute\_name, … but not some mix of the two as you have there Fred