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AN@S

2008-Mar-19 18:44 UTC

Saving a new object n times to the DB

Hello,

I have a generate method that generate PIN codes and serial numbers n times,
n comes from a user-submitted form, something like that:

<% form_for :card, :url => {:action => "generate"} do |f|
-%>
  <p>Number of cards<br /><%= f.text_field :number_of_cards,
:size => 10
%></p>

  <%= submit_tag ''Generate'' %>
<% end -%>

In the controller I have:

def generate
  params[:number_of_cards].to_i.times do
    pin    = rand(999999999999).to_s.center(12, rand(9).to_s)
    serial = rand(999999999999).to_s.center(12, rand(9).to_s)
    Card.create({:pin => pin, :serial => serial})
  end
end

Everything looks OK, but when I put a number and submit the form I got
nothing! No error messages and no records are saved to the database !!!
When I for example put :
3.times do
.... etc

3 new records are successfully created in the database !

what''s the problem? Maybe params[:number_of_cards] doesn''t get
the value
from the form? Why? And if so why don''t I get error about some nil
value?

Your help is really appreciated.

Regards

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Frederick Cheung

2008-Mar-19 19:09 UTC

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Re: Saving a new object n times to the DB

On 19 Mar 2008, at 18:44, AN@S wrote:
>
> 3 new records are successfully created in the database !
>
> what''s the problem? Maybe params[:number_of_cards]
doesn''t get the
> value from the form? Why? And if so why don''t I get error about
some
> nil value?
>Because the parameter is being submitted as params[:card] 
[:number_of_cards] (that''s what form_for does). You can see this in  
your logs. You get no error because nil.to_i is 0

Fred

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Rob Biedenharn

2008-Mar-19 19:20 UTC

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Re: Saving a new object n times to the DB

On Mar 19, 2008, at 2:44 PM, AN@S wrote:> Hello,
>
> I have a generate method that generate PIN codes and serial numbers  
> n times, n comes from a user-submitted form, something like that:
>
> <% form_for :card, :url => {:action => "generate"} do
|f| -%>
>   <p>Number of cards<br /><%= f.text_field :number_of_cards,
:size
> => 10 %></p>
>
>   <%= submit_tag ''Generate'' %>
> <% end -%>
>
> In the controller I have:
>
> def generate
>   params[:number_of_cards].to_i.times do
>     pin    = rand(999999999999).to_s.center(12, rand(9).to_s)
>     serial = rand(999999999999).to_s.center(12, rand(9).to_s)
>     Card.create({:pin => pin, :serial => serial})
>   end
> end
>
> Everything looks OK, but when I put a number and submit the form I  
> got nothing! No error messages and no records are saved to the  
> database !!!
> When I for example put :
> 3.times do
> .... etc
>
> 3 new records are successfully created in the database !
>
> what''s the problem? Maybe params[:number_of_cards]
doesn''t get the
> value from the form? Why? And if so why don''t I get error about
some
> nil value?
>
> Your help is really appreciated.
>
> Regards

You have form_for :card and then f.text_field :number_of_cards, so  
you''ll get a params[:card][:number_of_cards]

Your params[:number_of_cards] is therefore almost certainly nil and  
nil.to_i == 0

It can help tremendously to put:
<%= debug(params) %>

Into the view that comes back so you can see what really happens (or  
just go look in the log/development.log where you should also see the  
params hash).

-Rob

Rob Biedenharn		http://agileconsultingllc.com
Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org


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AN@S

2008-Mar-20 09:58 UTC

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Re: Saving a new object n times to the DB

Thanks Frederick and Rob, now it works :)
This debug option is really useful I didn''t know about it before>

Thanks

On 19/03/2008, Rob Biedenharn
<Rob-GBZH0y1GwQfnZcttdmLDtcI/UQi/AW5J@public.gmane.org>
wrote:>
> On Mar 19, 2008, at 2:44 PM, AN@S wrote:
>
> Hello,
>
> I have a generate method that generate PIN codes and serial numbers n
> times, n comes from a user-submitted form, something like that:
>
> <% form_for :card, :url => {:action => "generate"} do
|f| -%>
>   <p>Number of cards<br /><%= f.text_field :number_of_cards,
:size => 10
> %></p>
>
>   <%= submit_tag ''Generate'' %>
> <% end -%>
>
> In the controller I have:
>
> def generate
>   params[:number_of_cards].to_i.times do
>     pin    = rand(999999999999).to_s.center(12, rand(9).to_s)
>     serial = rand(999999999999).to_s.center(12, rand(9).to_s)
>     Card.create({:pin => pin, :serial => serial})
>   end
> end
>
> Everything looks OK, but when I put a number and submit the form I got
> nothing! No error messages and no records are saved to the database !!!
> When I for example put :
> 3.times do
> .... etc
>
> 3 new records are successfully created in the database !
>
> what''s the problem? Maybe params[:number_of_cards]
doesn''t get the value
> from the form? Why? And if so why don''t I get error about some nil
value?
>
> Your help is really appreciated.
>
> Regards
>
>
> You have form_for :card and then f.text_field :number_of_cards, so
you''ll
> get a params[:card][:number_of_cards]
>
> Your params[:number_of_cards] is therefore almost certainly nil and
> nil.to_i == 0
>
> It can help tremendously to put:
> <%= debug(params) %>
>
> Into the view that comes back so you can see what really happens (or just
> go look in the log/development.log where you should also see the params
> hash).
>
> -Rob
>
> Rob Biedenharn http://agileconsultingllc.com
> Rob-xa9cJyRlE0mWcWVYNo9pwxS2lgjeYSpx@public.gmane.org
>
>
> >
>

-- 
Anas Marrawi
Visit me at: www.anasonline.net

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Rails - Mar 2008 - Saving a new object n times to the DB

Saving a new object n times to the DB

Re: Saving a new object n times to the DB

Re: Saving a new object n times to the DB

Re: Saving a new object n times to the DB