How do you count Booleans in a model?

Rails
1

Hey…

I’d like to knw how to count the number of trues or falses a boolean
in my model contains…

Example:

create_table :opinions do |t|
t.boolean :agree
end

In this migration… if :agree is true… that means that the user,
for instance, agrees and if :agree is false, the user disagrees…

I’m trying o calculate is as follows…

o = Opinion.new
o.agree = true
o.save

And then… When I do this…

Opinion.count

it returns 1 wich is good…

But as soon as I want to know the number of Trues or Falses… doesnt
work !!!

Example:

Opinion.count( :conditions => “agree == true” )

please somebody help me out with this…

Is there a way of counting the number of boolean values in your
db ???

Thx

Louis-Pierre

2

On Fri, Jul 4, 2008 at 11:11 PM, [email protected]
[email protected] wrote:

Example:

Opinion.count( :conditions => “agree == true” )

please somebody help me out with this…

Is there a way of counting the number of boolean values in your
db ???

Try “=” instead of “==”.

Opinion.count(:conditions => “agree = true”)

Something like that worked for me with one of my models in
script/console.

Regards,
Craig

3

Craig D. wrote:

On Fri, Jul 4, 2008 at 11:11 PM, [email protected]
[email protected] wrote:

Example:

Opinion.count( :conditions => “agree == true” )

please somebody help me out with this…

Is there a way of counting the number of boolean values in your
db ???

Try “=” instead of “==”.

Opinion.count(:conditions => “agree = true”)

Something like that worked for me with one of my models in
script/console.

Regards,
Craig

Opinion.count(:conditions => “agree = true”) will work fine.
I has thought Opinion.sum(:agree) will work fine too,but it didn’t,this
generate the sql:
select sum(‘opinions’.agree) as sum_agree from ‘opinions’,
and returns 0 forever,I copy this sql and execute it by hand,it will
work fine just like the Opinion.count(:conditions => “agree = true”).So
it maybe some strange?

4

On Sat, Jul 5, 2008 at 3:28 PM, Wu Junchen
[email protected] wrote:

Craig D. wrote:

Opinion.count( :conditions => “agree == true” )
Opinion.count(:conditions => “agree = true”)

This is a database specific solution and would break on PostgreSQL for
example.

A better way unless you really know what you are doing is:

Opinion.count(:conditions => {:agree => true})

Which will work on any database.

or

Opinion.count(:conditions => [“agree = ?”, true])

Mikel

–

Rails, RSpec, Puppet and Life blog…

5

Thx a lot guys !!!

Craig… I had already tried this before i came here to ask for
help… Thx anyway !

Mikel, you saved me… That’s exactly what I needed… thx a lot !!!

Louis-Pierre

6

On Sat, Jul 5, 2008 at 2:22 AM, Mikel L. [email protected]
wrote:

Opinion.count(:conditions => {:agree => true})

Which will work on any database.

or

Opinion.count(:conditions => [“agree = ?”, true])

Excellent point, Mikel.

Thanks,
Craig