# Passing parameters on rails **URL:** \ **Category:** Rails\ **Created:** [April 3, 2008, 7:35pm UTC](https://www.ruby-forum.com/t/passing-parameters-on-rails/133798 "2008-04-03T19:35:40Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![add](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/0ea827/32.png) [@add](https://www.ruby-forum.com/u/add)\ **Post date:** [April 3, 2008, 7:35pm UTC](https://www.ruby-forum.com/t/passing-parameters-on-rails/133798/1 "2008-04-03T19:35:40Z")
Hi, I want to know how I can pass the following parameters … I have faculdade: id, name curso : id, faculdade\_id and the following code #view \<%= select(:curso, :faculdade\_id , Faculdade.find(:all).collect {|c| [c.nome, c.id] }) %\> Preço do Curso controller def lista\_faculdade teste = params[:teste] @faculdade\_teste = Curso.find(:all).select do |student| student.faculdade\_id = teste end if I try to do it manually (with /cursos/lista\_faculdade?teste=3 for example it works all I need to know is how to pas the parameter from the select to the href link Thanks in advance! =\* ---
**Author:** ![add](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/0ea827/32.png) [@add](https://www.ruby-forum.com/u/add)\ **Post date:** [April 3, 2008, 8:46pm UTC](https://www.ruby-forum.com/t/passing-parameters-on-rails/133798/2 "2008-04-03T20:46:06Z")
On 3 Apr 2008, at 18:35, Laura Laizer smith wrote: > \<%= select(:curso, :faculdade\_id , Faculdade.find(:all).collect {|c| > [c.nome, c.id] }) %\> > > Preço do Curso > > controller You’ll need to use some javascript to do that, unless you use a form (you can always style the button to look like what you want). Fred ---
**Author:** ![add](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/0ea827/32.png) [@add](https://www.ruby-forum.com/u/add)\ **Post date:** [April 4, 2008, 12:43am UTC](https://www.ruby-forum.com/t/passing-parameters-on-rails/133798/3 "2008-04-04T00:43:34Z")
Yes, look into observe\_field in the API, and you could easily write a small RJS template which replaced the link with one with the appropriately inserted value. Julian. Learn Ruby on Rails! CHECK OUT THE FREE VIDS (LIMITED TIME) VIDEO #3 OUT APRIL 6 [http://sensei.zenunit.com/](http://sensei.zenunit.com/) ---
**Author:** ![add](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/0ea827/32.png) [@add](https://www.ruby-forum.com/u/add)\ **Post date:** [April 4, 2008, 1:06am UTC](https://www.ruby-forum.com/t/passing-parameters-on-rails/133798/4 "2008-04-04T01:06:26Z")
Just also of interest, is this: > def lista\_faculdade > teste = params[:teste] > @faculdade\_teste = Curso.find(:all).select do |student| > student.faculdade\_id = teste > end You should probably be using Curso.find\_by\_faculdade\_id(teste) as this will put the searching at the database level (this is what databases are good at), and not force Rails to load the entire dataset into memory to only then filter it back using Ruby’s select iterator. Julian. Learn Ruby on Rails! CHECK OUT THE FREE VIDS (LIMITED TIME) VIDEO #3 OUT APRIL 6 [http://sensei.zenunit.com/](http://sensei.zenunit.com/) ---
**Author:** ![add](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/0ea827/32.png) [@add](https://www.ruby-forum.com/u/add)\ **Post date:** [April 4, 2008, 5:07pm UTC](https://www.ruby-forum.com/t/passing-parameters-on-rails/133798/5 "2008-04-04T17:07:16Z")
Laura Laizer smith wrote: > > You should probably be using Curso.find\_by\_faculdade\_id(teste) as this > > will put the searching at the database level (this is what databases > > are good at), and not force Rails to load the entire dataset into > > memory to only then filter it back using Ruby’s select iterator. > > thanks i will be studying now and see how far I can get ! I tried the following #view Search: \<%= observe\_field ‘faculdade\_find’, :frequency =\> 0.5, :update =\> ‘results’, :url =\> { :controller =\> ‘curso’, :action=\> ‘lista\_faculdade’ }, :with =\> “‘search\_text=’ + escape(value)”%\> #controller def lista\_faculdade teste = params[‘search\_text’] @faculdade\_teste = Curso.find(:all).select do |curso| curso.nome\_curso = teste end @curso\_pages, @cursos = paginate\_collection @faculdade\_teste, :per\_page =\> 10 end def show @curso = Curso.find(params[:id]) end but it’s not finding, instead it’s changing the name of all cursos … Can someone tell me what am I doing wrong ? ---
**Author:** ![add](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/0ea827/32.png) [@add](https://www.ruby-forum.com/u/add)\ **Post date:** [April 4, 2008, 2:34am UTC](https://www.ruby-forum.com/t/passing-parameters-on-rails/133798/6 "2008-04-04T02:34:42Z")
> You should probably be using Curso.find\_by\_faculdade\_id(teste) as this > will put the searching at the database level (this is what databases > are good at), and not force Rails to load the entire dataset into > memory to only then filter it back using Ruby’s select iterator. thanks i will be studying now and see how far I can get ! ---
**Author:** ![add](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/0ea827/32.png) [@add](https://www.ruby-forum.com/u/add)\ **Post date:** [April 4, 2008, 5:38pm UTC](https://www.ruby-forum.com/t/passing-parameters-on-rails/133798/7 "2008-04-04T17:38:50Z")
On 4 Apr 2008, at 16:07, Laura Laizer smith wrote: > def lista\_faculdade > teste = params[‘search\_text’] > @faculdade\_teste = Curso.find(:all).select do |curso| > curso.nome\_curso = teste > I suspect you want curso.nome\_curso == teste, otherwise as you note > you will just be assigning (and since you are assigning non null > values you are effectively selecting them all) Fred ---
**Author:** ![add](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/0ea827/32.png) [@add](https://www.ruby-forum.com/u/add)\ **Post date:** [April 4, 2008, 6:46pm UTC](https://www.ruby-forum.com/t/passing-parameters-on-rails/133798/8 "2008-04-04T18:46:15Z")
Frederick C. wrote: > On 4 Apr 2008, at 16:07, Laura Laizer smith wrote: > > > def lista\_faculdade > > teste = params[‘search\_text’] > > @faculdade\_teste = Curso.find(:all).select do |curso| > > curso.nome\_curso = teste > > I suspect you want curso.nome\_curso == teste, otherwise as you note > > you will just be assigning (and since you are assigning non null > > values you are effectively selecting them all) > > Fred Half of my problems are solved I can do search now but if I try Math for instance it opens 4 frames inside the frame of app to then do the math search the same number of letter I type the same frames it open inside the application I think I am doing something very stupid But I dont know what … ---
**Author:** ![add](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/0ea827/32.png) [@add](https://www.ruby-forum.com/u/add)\ **Post date:** [April 4, 2008, 6:49pm UTC](https://www.ruby-forum.com/t/passing-parameters-on-rails/133798/9 "2008-04-04T18:49:54Z")
Laura Laizer smith wrote: > Frederick C. wrote: You are doing it inside a for condition … Dunno you can replace it but when you use do it’s a iteration…