Count of records meeting condition

Rails
1

Forgive this question, but I’m new to rails, and my SQL is rather rusty.
I have a line like so to get all records for a particular time period:

@recordings_for_period = Recording.find(:all, :order => “date_of_event
DESC”, :conditions => [“date_of_event >= ? AND date_of_event < ?”,
start_date, end_date])

Let say, instead, I just want to know the number of recordings that are
available for that time period. Should I just run the above code and
then get the length of the array? Or is there some construction I should
be using with COUNT that would be better? (I.e., is less work for the
database to process.)

Oh, and (unfortunately) I am still using rails 2.3.5.

2

On 27 August 2010 06:13, Terry M. [email protected] wrote:

be using with COUNT that would be better? (I.e., is less work for the
database to process.)

@count_of_recordings_for_period = Recording.count(:all, :order =>
“date_of_event
DESC”, :conditions => [“date_of_event >= ? AND date_of_event < ?”,
start_date, end_date])

should use COUNT in the sql to give the answer you want.

Colin

3

On 27 Aug, 06:13, Terry M. [email protected] wrote:

be using with COUNT that would be better? (I.e., is less work for the
database to process.)

There’s a count method that does what you want

Fred