On Oct 11, 1:09 am, Alex Jonsson <[EMAIL PROTECTED]> wrote:
> Thanks! Although your answer didn't solve the issue at hand, it
> definitely put me on the right track!
>
> The solution I found was to use the :include key in the maximum
> method. This is what I ended up with:
>
> def total_time
> @flight = Flight.find(self.id)
> @flight_hours = FlightTime.maximum( :hours,
> :include => [:flight_type],
> :conditions =>
> ['flight_types.count_to_total != "f"'],
> :group => :flight
> )
> @[EMAIL PROTECTED]
> end
>
You could make that rather more efficient by only considering the
FlightTime for the flight you are interested in, rather than
calculating it for all flights ever and throwing away the data for all
but one of them.
Fred
> On Oct 10, 11:24 pm, Frederick Cheung <[EMAIL PROTECTED]>
> wrote:
>
> > maximum take most of the options that find does, eg :conditions
> > and :joins
>
> > Fred
>
> > Sent from my iPhone
>
> > On 10 Oct 2008, at 21:01, Alex <[EMAIL PROTECTED]> wrote:
>
> > > Hey guys, I have a problem you'll hopefully be able to help me with.
>
> > > I'm developing a logbook, and I have the following database structure:
>
> > > users (table) ---> flights (table) ---> flight_times (table) <---
> > > flight_types (table)
>
> > > The flight_times are connected to flights with column flight_id, and
> > > to the flight_types via flight_type_id.
>
> > > flight_times (table)
> > > :flight_id
> > > :flight_type_id
> > > :hours (decimal)
>
> > > In order to fetch the flight_times with the highest hours count
> > > belonging to a specific flight, I use the following function:
>
> > > def total_time
> > > [EMAIL PROTECTED] = Flight.find(self.id)
> > > [EMAIL PROTECTED] = FlightTime.maximum(:hours, :group => :flight) #
> > > FlightTime :belongs_to :flight
> > > [EMAIL PROTECTED]@flight].to_s
> > > end
>
> > > So far so good, it returns the value of the highest :hours count.
>
> > > HOWEVER, here starts the difficulty for me.
>
> > > The flight_types table has two columns:
>
> > > flight_types (table)
> > > :name
> > > :count_to_total (boolean)
>
> > > If the :count_to_total is false, I do not want it to be included when
> > > the total_time method looks for the maximum value.
>
> > > Did you get that?
--~--~---------~--~----~------------~-------~--~----~
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 [email protected]
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---
