Rails - May 2009 - compare this sql query and corresponding ruby code

Hi
   Suppose I have a two models Ticket and Activity

Ticket has_many activities
Activity belongs_to Ticket

    Now suppose if the Activity has field name Now for a Ticket with
id=1 say there are 10 activities So to update name of all activities  I
can directly wite the sql statement

update activities set name=''somename'' where ticket_id=1

    So I am writing this like

ticket = Ticket.find(1)
ticket.activities.each do |a|
  a.update_attribute(:name => ''somename'')
end
     But what about the performance Is both the above query and the ruby
code has same performance What is actually the generated sql for the
ruby code
    Or Am I wrong? Is there any other way of doing this same like sql
above?

Thanks in advance
Sijo
-- 
Posted via http://www.ruby-forum.com/.

Hi
  I tried like
Activity.update_all("name=''hi''", :conditions =>
["ticket_id =?",1])

  But getting error
ActiveRecord::StatementInvalid: RuntimeError: ERROR     C42703  Mcolumn 
activities.conditions does not exist    P42     Fparse_func.c 
L1104   Runknown_attribute: UPDATE "activities" SET
name=''hi'' WHERE
("activities"."conditions" IN (E''ticket_id
=?'',1))
  Could you please correct the syntax
Sijo
-- 
Posted via http://www.ruby-forum.com/.

Here''s the correct sintax:

Activity.update_all( [ ''name = ?'', ''hi'' ] ,
["ticket_id =?",1])


-
Maurício Linhares
http://alinhavado.wordpress.com/ (pt-br) | http://blog.codevader.com/ (en)



On Wed, May 13, 2009 at 8:24 AM, Sijo Kg
<rails-mailing-list-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
>
> Hi
>  I tried like
> Activity.update_all("name=''hi''", :conditions
=> ["ticket_id =?",1])
>
>  But getting error
> ActiveRecord::StatementInvalid: RuntimeError: ERROR     C42703  Mcolumn
> activities.conditions does not exist    P42     Fparse_func.c
> L1104   Runknown_attribute: UPDATE "activities" SET
name=''hi'' WHERE
> ("activities"."conditions" IN (E''ticket_id
=?'',1))
>  Could you please correct the syntax
> Sijo
> --
> Posted via http://www.ruby-forum.com/.
>
> >
>

hi,

try to look to your development log, u''ll see sql queries there.

and you might try this:

ticket = Ticket.find(1, :include => [:activity])

and see your query again

tom

Sijo Kg wrote:
> Hi
>    Suppose I have a two models Ticket and Activity
> 
> Ticket has_many activities
> Activity belongs_to Ticket
> 
>     Now suppose if the Activity has field name Now for a Ticket with
> id=1 say there are 10 activities So to update name of all activities  I
> can directly wite the sql statement
> 
> update activities set name=''somename'' where ticket_id=1
> 
>     So I am writing this like
> 
> ticket = Ticket.find(1)
> ticket.activities.each do |a|
>   a.update_attribute(:name => ''somename'')
> end
>      But what about the performance Is both the above query and the ruby
> code has same performance What is actually the generated sql for the
> ruby code
>     Or Am I wrong? Is there any other way of doing this same like sql
> above?
> 
> Thanks in advance
> Sijo

-- 
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===============================================================================

Hi
   Thanks for the reply.This working ut another question how can we 
specify :conditions with update_all

Sijo
-- 
Posted via http://www.ruby-forum.com/.