AFAICT, this is what you're looking for.
class Location
...
has_many :birds, :through => :reports
has_many :reports
def ra_index(bird)
reports.bird_id_is(bird.id).size / reports.size
end
end
One note: you probably want to use all-lowercase names for your
field/column names. In Ruby, names that start with uppercase are used
for constants.
Bryan
On 11-03-27 10:23 AM, Kaustubh Naik wrote:
On Sat, Mar 26, 2011 at 4:26 AM, Matt Jones <[email protected]
<mailto:[email protected]>> wrote:
I'm not quite sure what you mean - row and record counts of what?
It'll be a lot easier to help if we have a clearer idea of what your
models are and how they're related.
Extremely sorry for the inadequate information provided. Here is what I
want to do
I have three models namely Bird, Location and Report!
The report is model looks like this
class Report < ActiveRecord::Base
hobo_model # Don't put anything above this
fields do
Date :date
#Plumage :string
Plumage enum_string(:Breeding, :NonBreeding )
#Weather :string
Weather enum_string(:Cloudy, :Sunny, :Humid)
RAIndex :integer
Time enum_string(:Dawn, :Morning, :Noon, :Evening, :Dusk, :Night)
timestamps
end
belongs_to :bird
belongs_to :location
The field RA Index is a value assigned with each bird specie. It is the
ratio of number of reports in which 'X' bird is reported at 'P' location
to the number total reports for that location. I need to calculate that
Index.
Please guide me through.
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Kaustubh Naik
Goa-India
http://geekblues.in/
[email protected] <mailto:[email protected]>
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