Newby Question about Methods

Rails
1

Hi,

i´m new to Ruby and have some problems when i´m creating
new methods for my application. I read different tutorials and
understand the structure (okay, i thought i did ;-)).

Now i build my own little application where i have 4 models: the user,
book, category and booking. The booking model has among others 2 fields,
startdate enddate.
I have a list with bookings from a user, where i want show which books
he had lend from which category and show the difference between the end
and the start-date (not in words, mayby in days or hours). Around this
list i have an each do loop.
Now i have found different examples to create a method to get the
date difference, but i don´t know HOW i have to implent it in my
application, WHERE this method has to stand (in the Model or the
controller?) and how it has to look in the view.

thanks for your help!

2

I have a list with bookings from a user, where i want show which books
he had lend from which category and show the difference between the end
and the start-date (not in words, mayby in days or hours). Around this
list i have an each do loop.
Now i have found different examples to create a method to get the
date difference, but i dont know HOW i have to implent it in my
application, WHERE this method has to stand (in the Model or the
controller?) and how it has to look in the view.

Personally, I’d have 2 methods here: a booking_length method on your
model (which sounds like it it just needs to compute the difference
between those 2 columns) and a view helper (say display_booking_length
that calls that method and turns the returned number into a user
readable string.

Your view just needs to do

<%= display_booking_length booking %>

fred

3

Thanks for your help!

The 2 columns in the booking model are end_at and start_at and i need
the difference between these two dates in minutes. In the booking model
i want to do something like this:

booking.rb
def date_diff
minutes = Booking.new
date2 = Time.end_at
date1 = Time.start_at
difference = date2 - date1
minutes = (difference % 3600) / 60
end

booking.controller
???

I´m aware that this method doesn´t work but have problemes to bring it
in the right form. And how does the view helper has to look like?