# Design-Problem **URL:** \ **Category:** Rails\ **Created:** [October 17, 2006, 2:08pm UTC](https://www.ruby-forum.com/t/design-problem/72472 "2006-10-17T14:08:21Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![flnative](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/5daacb/32.png) [@flnative](https://www.ruby-forum.com/u/flnative)\ **Post date:** [October 17, 2006, 2:08pm UTC](https://www.ruby-forum.com/t/design-problem/72472/1 "2006-10-17T14:08:21Z")
hi @ all I’ve a design problem in my ror-project. I’m using a simple rails-application to manage some data. I would like to present percentage-numbers in different views. But I want to save the percentages as a decimal number in the database. When I save or read a record, is that the job for the controller or the model, to present me the percentage number (not the saved decimal number)? Why? Thanks for the solutions… ---
**Author:** ![flnative](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/5daacb/32.png) [@flnative](https://www.ruby-forum.com/u/flnative)\ **Post date:** [October 17, 2006, 2:33pm UTC](https://www.ruby-forum.com/t/design-problem/72472/2 "2006-10-17T14:33:42Z")
On 17 Oct 2006, at 13:08, M. R. wrote: > I’ve a design problem in my ror-project. I’m using a simple > rails-application to manage some data. I would like to present > percentage-numbers in different views. But I want to save the > percentages as a decimal number in the database. > > When I save or read a record, is that the job for the controller or > the > model, to present me the percentage number (not the saved decimal > number)? Why? Neither, it’s a view responbsibility, ideally using a helper function. Why? Because it’s about formatting and presentation. number\_to\_percentage() will do the job nicely. Paul ---
**Author:** ![flnative](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/5daacb/32.png) [@flnative](https://www.ruby-forum.com/u/flnative)\ **Post date:** [October 17, 2006, 2:35pm UTC](https://www.ruby-forum.com/t/design-problem/72472/3 "2006-10-17T14:35:51Z")
Paul L. wrote: > On 17 Oct 2006, at 13:08, M. R. wrote: > Neither, it’s a view responbsibility, ideally using a helper > function. Why? Because it’s about formatting and presentation. > > number\_to\_percentage() will do the job nicely. But when I use the number for a calculation before I present it on a view? Is it a controller-task? ---
**Author:** ![flnative](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/5daacb/32.png) [@flnative](https://www.ruby-forum.com/u/flnative)\ **Post date:** [October 19, 2006, 2:45am UTC](https://www.ruby-forum.com/t/design-problem/72472/4 "2006-10-19T02:45:58Z")
On 10/17/06, M. R. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > But when I use the number for a calculation before I present it on a > view? Is it a controller-task? Probably a model task. Depends on what your calculating an for what purpose. For example calculating the total value of an order across all the order line items is certainly a model responsibility. Adding up a whole bunch of numbers that the user has ticked on a form would be more in the controller’s domain. Cheers, Max ---
**Author:** ![flnative](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/5daacb/32.png) [@flnative](https://www.ruby-forum.com/u/flnative)\ **Post date:** [October 20, 2006, 7:51am UTC](https://www.ruby-forum.com/t/design-problem/72472/5 "2006-10-20T07:51:05Z")
On 10/19/06, M. R. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > all the order line items is certainly a model responsibility. Adding > > Is it a controller or model task? > > The newbie need help. Thanks for your solution! I’d put it in the model. It is clearly a business-logic-type task. Max ---
**Author:** ![flnative](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/f/5daacb/32.png) [@flnative](https://www.ruby-forum.com/u/flnative)\ **Post date:** [October 19, 2006, 9:13am UTC](https://www.ruby-forum.com/t/design-problem/72472/6 "2006-10-19T09:13:12Z")
Max M. wrote: > On 10/17/06, M. R. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > > But when I use the number for a calculation before I present it on a > > view? Is it a controller-task? > > Probably a model task. Depends on what your calculating an for what > purpose. For example calculating the total value of an order across > all the order line items is certainly a model responsibility. Adding > up a whole bunch of numbers that the user has ticked on a form would > be more in the controller’s domain. > > Cheers, > Max Every day, the user ticked on a form some percentage changes in. With this number and some saved records from the database, I calculate a value. This calculated value and the percentage change are saved in the database. Is it a controller or model task? The newbie need help. Thanks for your solution!