Design-Problem

Rails
1

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…

2

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

3

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?

4

On 10/17/06, M. R. [email protected] 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

5

On 10/19/06, M. R. [email protected] 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

6

Max M. wrote:

On 10/17/06, M. R. [email protected] 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!