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ayesha fernando

2012-Apr-01 01:04 UTC

Help with the has_one model implementation

I keep getting the following error:
NoMethodError in Students#show
undefined method `student_accounts_path'' for
#<#Class:0x007ffe2bf6d688>:0x007ffe2c5e5628>

I am trying to implement a has_one model. I followed the rails guide
that used the :post has_many :comments example and tweaked it a bit.

my routes.rb file looks like this:
resources :students do
    resource :account
end

My Students.controller, Account.controller files are attached.
Along with the /app/views/students/show.html.erb file

I have no idea what I''m doing wrong.
Can anyone please help me?

Attachments:
http://www.ruby-forum.com/attachment/7210/students_controller.rb
http://www.ruby-forum.com/attachment/7211/accounts_controller.rb
http://www.ruby-forum.com/attachment/7212/show.html.erb


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Bente Pieck

2012-Apr-01 02:14 UTC

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Re: Help with the has_one model implementation

Try

  rake routes

 - and you will see, there really isn''t defined a student_acounts_path

Try:
resources :students do
  resources :accounts
end


or alternatively in your show (if you want to add a show, edit or
update-action in your accounts_controller without an :id param)

form_for [@student, @student.build_account], :url =>
student_account_path(@student)


best,
B. Pieck


On Sun, Apr 1, 2012 at 3:04 AM, ayesha fernando
<lists-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>wrote:
> I keep getting the following error:
> NoMethodError in Students#show
> undefined method `student_accounts_path'' for
> #<#Class:0x007ffe2bf6d688>:0x007ffe2c5e5628>
>
> I am trying to implement a has_one model. I followed the rails guide
> that used the :post has_many :comments example and tweaked it a bit.
>
> my routes.rb file looks like this:
> resources :students do
>    resource :account
> end
>
> My Students.controller, Account.controller files are attached.
> Along with the /app/views/students/show.html.erb file
>
> I have no idea what I''m doing wrong.
> Can anyone please help me?
>
> Attachments:
> http://www.ruby-forum.com/attachment/7210/students_controller.rb
> http://www.ruby-forum.com/attachment/7211/accounts_controller.rb
> http://www.ruby-forum.com/attachment/7212/show.html.erb
>
>
> --
> Posted via http://www.ruby-forum.com/.
>
> --
> You received this message because you are subscribed to the Google Groups
> "Ruby on Rails: Talk" group.
> To post to this group, send email to
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> To unsubscribe from this group, send email to
>
rubyonrails-talk+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> For more options, visit this group at
> http://groups.google.com/group/rubyonrails-talk?hl=en.
>
>
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ayesha fernando

2012-Apr-01 07:06 UTC

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Re: Help with the has_one model implementation

Thanks for your tips Bente,

I ran rake routes, and this is what I got:
student_account POST   /students/:student_id/account(.:format)
accounts#create

I thought my routes.rb file HAD to be like this:
resources :students do
  resource :account
end

because my Student model only ''has_one'' Account (not a
has_many)

I changed my form_for to:
form_for ([@student, @student.build_account], :url =>
student_account_path(@student))

And I am no longer getting the ''NoMethodError'' BUT the account
information is not being saved to the accounts table.

What key concept am I not understanding?

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YogiZoli

2012-Apr-01 10:49 UTC

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Re: Help with the has_one model implementation

Hi Ayesha,

it might be a typo in your routes:

resource :accounts  insted of resourceS :accounts

Also please if you want to connect these tables you need a couple of
things, not only nested routes.
You also need:
- has_many relationship in student.rb
- belongs_to relationship in account.rb
- you need to add 1-1 table column to both tables which refers to each
others. Best way to do it with migrations like "rails generate
migration AddStudentIdForAccounts" and AddAccountIdForStudents. Follow
this http://guides.rubyonrails.org/migrations.html
Fill these, then run "rake db:migrate"
Finally you need the proper nested routes you mentioned above, also
controllers and views in place with well-named methods.

So in short way:
2 tables refers to each other (with 2 migrations),
2 model files refers to each other,
routes.rb,
controllers,
views.

HTH!
YogiZoli

PS. Highly recommend you this tutorial instead of Guides first:
http://ruby.railstutorial.org/ruby-on-rails-tutorial-book?version=3.2
this helped me a lot in understanding full MVC in action!


On Apr 1, 9:06 am, ayesha fernando
<li...-fsXkhYbjdPsEEoCn2XhGlw@public.gmane.org>
wrote:> Thanks for your tips Bente,
>
> I ran rake routes, and this is what I got:
> student_account POST   /students/:student_id/account(.:format)
> accounts#create
>
> I thought my routes.rb file HAD to be like this:
> resources :students do
>   resource :account
> end
>
> because my Student model only ''has_one'' Account (not a
has_many)
>
> I changed my form_for to:
> form_for ([@student, @student.build_account], :url =>
> student_account_path(@student))
>
> And I am no longer getting the ''NoMethodError'' BUT the
account
> information is not being saved to the accounts table.
>
> What key concept am I not understanding?
>
> --
> Posted viahttp://www.ruby-forum.com/.
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ayesha fernando

2012-Apr-01 11:37 UTC

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Re: Help with the has_one model implementation

Hi YogiZoli,

Thanks for your post.

I think you meant has_one instead of ''has_many'' (in your first
bullet
point for student.rb).
I tried what you suggested, and my routes.rb file has
resource :accounts

I also went back to my original "form_for" text as per my attachment
and
I no longer see that NoMethodError (YAY!) that I first posted up.

I figured out why  (at least i think i did) my ''insert into
accounts''
would delete when I rendered the show.html.erb file after creating an 
account.... I had the text ":dependent => :destroy" in the model.rb
file

I''ve updated my models to have that 1-1 relationship.
While I was testing it out, I noticed the following in my server logs...

*****************************
Started POST "/students/4/accounts" for 127.0.0.1 at 2012-04-01
21:16:19
+1000
Processing by AccountsController#create as HTML
  Parameters: {"utf8"=>"✓", 
"authenticity_token"=>"FEdjo1+qRJ1cIQpwIbpRnvJ51esPgd/K8s9Hb4MOylQ=",
"account"=>{"name"=>"acname1",
"number"=>"1111"}, "commit"=>"Create
Account", "student_id"=>"4"}
  Student Load (0.4ms)  SELECT `students`.* FROM `students` WHERE 
`students`.`id` = 4 LIMIT 1
   (0.4ms)  BEGIN
  SQL (0.5ms)  INSERT INTO `accounts` (`created_at`, `name`, `number`, 
`student_id`, `updated_at`) VALUES (''2012-04-01 11:16:20'',
''acname1'',
''1111'', 4, ''2012-04-01 11:16:20'')
   (0.7ms)  COMMIT
  Account Load (0.3ms)  SELECT `accounts`.* FROM `accounts` WHERE 
`accounts`.`student_id` = 4 LIMIT 1
   (0.1ms)  BEGIN
   (0.1ms)  COMMIT
Redirected to http://localhost:3000/students/4
Completed 302 Found in 11ms (ActiveRecord: 2.4ms)


Started GET "/students/4" for 127.0.0.1 at 2012-04-01 21:16:20 +1000
Processing by StudentsController#show as HTML
  Parameters: {"id"=>"4"}
  Student Load (0.3ms)  SELECT `students`.* FROM `students` WHERE 
`students`.`id` = 4 LIMIT 1
  Account Load (0.4ms)  SELECT `accounts`.* FROM `accounts` WHERE 
`accounts`.`student_id` = 4 LIMIT 1
   (0.1ms)  BEGIN
   (0.3ms)  UPDATE `accounts` SET `student_id` = NULL, `updated_at` = 
''2012-04-01 11:16:20'' WHERE `accounts`.`id` = 4
   (28.6ms)  COMMIT
  Rendered students/show.html.erb within layouts/application (36.4ms)
Completed 200 OK in 46ms (Views: 14.5ms | ActiveRecord: 29.8ms)
*****************

After entering the account details I make it redirect to the 
app/views/student/show.html.erb view because I basically want to just 
update the "show" page. BUT I can see that the student_id is being 
updated to NULL - why is that?

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ayesha fernando

2012-Apr-02 04:49 UTC

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Re: Help with the has_one model implementation

I think I figured it out.
It was to do with my @student.build_account in the students#show method.
(And as per my original post, I think I had that in my form_for tag).

Because I''m returning to the same page, the foreign key was continually
being ''built''.

My students controller looks likes this:
 def show
    @student = Student.find(params[:id])
    @account = @student.account
    if @account.nil?
        @account = @student.build_account
    end

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @student }
    end
  end

And my accounts controller looks like this:
 def create
    @student = Student.find(params[:student_id])
    @account = @student.create_account(params[:account])
    redirect_to student_path(@student)
  end
end

And my app/views/students/show.html.erb is attached.

Attachments:
http://www.ruby-forum.com/attachment/7216/show.html.erb


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Rails - Apr 2012 - Help with the has_one model implementation

Help with the has_one model implementation

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Re: Help with the has_one model implementation

Re: Help with the has_one model implementation