should be simple -- will_paginate ordered by acts_as_rated

[Jeff Pritchard]

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
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[Frederick Cheung]

On Nov 10, 6:48 am, Jeff Pritchard <rails-mailing-l...@andreas-s.net>
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

[Jeff Pritchard]

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 ?

[Frederick Cheung]

On Nov 11, 3:07 am, Jeff Pritchard <rails-mailing-l...@andreas-s.net>
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

[Jeff Pritchard]

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

[Frederick Cheung]

On Nov 11, 4:01 pm, Jeff Pritchard <rails-mailing-l...@andreas-s.net>
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