Rails - Nov 2009 - should be simple -- will_paginate ordered by acts_as_rated

It seems like this should be very simple and very common.

I''m using "acts_as_rated" plugin to rate images
I''m using mislav-will_paginate gem to paginate a list of images
(not really relevant, but also using paperclip to attach the photo to
the "image" model

I figured I could do something like this:
@images = Image.paginate(:page => params[:page], :per_page => 10, :order
=> ''rating_avg'')

rating_avg is the name of the average rating in acts as rated

I get this error:
Mysql::Error: Unknown column ''rating_avg'' in ''order
clause'': SELECT *
FROM `images`      ORDER BY rating_avg LIMIT 0, 10

I''m using the:
:with_stats_table => true
option

What''s the right way to do this rather obvious action of sorting the
output of a rated model and paginating with will_paginate?

thanks,
jp
-- 
Posted via http://www.ruby-forum.com/.

On Nov 10, 6:48 am, Jeff Pritchard
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> It seems like this should be very simple and very common.
>
> I''m using "acts_as_rated" plugin to rate images
> I''m using mislav-will_paginate gem to paginate a list of images
> (not really relevant, but also using paperclip to attach the photo to
> the "image" model
>
> I figured I could do something like this:
> @images = Image.paginate(:page => params[:page], :per_page => 10,
:order
> => ''rating_avg'')
>
> rating_avg is the name of the average rating in acts as rated
>
I''m not familiar with acts_as_rated, however: where is the rating_avg
column ? if it is on some separate table then you''ll need to join on
that table.

Fred
> I get this error:
> Mysql::Error: Unknown column ''rating_avg'' in
''order clause'': SELECT *
> FROM `images`      ORDER BY rating_avg LIMIT 0, 10
>
> I''m using the:
> :with_stats_table => true
> option
>
> What''s the right way to do this rather obvious action of sorting
the
> output of a rated model and paginating with will_paginate?
>
> thanks,
> jp
> --
> Posted viahttp://www.ruby-forum.com/.

Frederick Cheung wrote:
> On Nov 10, 6:48�am, Jeff Pritchard <rails-mailing-l...@andreas-s.net>
> wrote:
>>
>> rating_avg is the name of the average rating in acts as rated
>>
> I''m not familiar with acts_as_rated, however: where is the
rating_avg
> column ? if it is on some separate table then you''ll need to join
on
> that table.
> 
> Fred
A little help with this?  I never did any stand-alone sql and don''t
know
an inner from an outer join.

If the class that we apply acts_as_rated to ("images" in my case)
winds
up with a
has_one :rating_statistic

and the rating_statistics model
belongs_to :image

and "rating_avg" is a member of the statistics table...

What would the join look like to :order  by :rating_avg ?

thanks,
jp
-- 
Posted via http://www.ruby-forum.com/.

On Nov 11, 3:07 am, Jeff Pritchard
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> If the class that we apply acts_as_rated to ("images" in my case)
winds
> up with a
> has_one :rating_statistic
>
> and the rating_statistics model
> belongs_to :image
>
> and "rating_avg" is a member of the statistics table...
>
> What would the join look like to :order  by :rating_avg ?
>
Well unless you care particularly about what the join looks like you
can just add :joins => rating_statistic to your find. Do take the time
to familiarize yourself with this sort of stuff though or it will bite
you on the ass eventually.

Fred
> thanks,
> jp
> --
> Posted viahttp://www.ruby-forum.com/.

Frederick Cheung wrote:
> On Nov 11, 3:07�am, Jeff Pritchard <rails-mailing-l...@andreas-s.net>
> wrote:
>>
> Well unless you care particularly about what the join looks like you
> can just add :joins => rating_statistic to your find. Do take the time
> to familiarize yourself with this sort of stuff though or it will bite
> you on the ass eventually.
> 
> Fred
Thanks Fred.  No joy.

This works fine but doesn''t order anything (obviously):
@images = Image.paginate(:page => params[:page], :per_page => 10)

This
@images = Image.paginate(:page => params[:page], :per_page => 10, :order 
=> ''rating_avg'')
gives me this error:
Mysql::Error: Unknown column ''rating_avg'' in ''order
clause'': SELECT *
FROM `images`      ORDER BY rating_avg LIMIT 0, 10

And your suggestion (slightly modified by me [single quotes added to 
rating_statistics] gives this
@images = Image.paginate(:page => params[:page], :per_page => 10, :joins 
=> ''rating_statistics'', :order =>
''rating_avg'')
Mysql::Error: Unknown table ''images'': SELECT `images`.* FROM
`images`
rating_statistics  ORDER BY rating_avg LIMIT 0, 10

thanks,
jp
-- 
Posted via http://www.ruby-forum.com/.

On Nov 11, 4:01 pm, Jeff Pritchard
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> Frederick Cheung wrote:
>
> And your suggestion (slightly modified by me [single quotes added to
> rating_statistics] gives this
it needs to be a symbol (otherwise it assumes you have constructed the
join statement already).

Fred