[Rails] looping through results of complex query

[clem_c_rock]

Hello,
I have a postgresql join query that returns all the correct values on
command line but when I try to loop through the results in a view, I can't
access all the fields.

Specifically, I'm trying to display the fields in the rations table and
can't seem to print them out to save my life.

Here's the query:

[code]
@herd_rations_during_season = HerdRation.find(:all,
:joins => ["INNER JOIN seasons ON seasons.herd_id =
herd_rations.herd_id AND seasons.season_start_date >=
herd_rations.grazing_begun AND herd_rations.grazing_end <=
seasons.season_end_date INNER JOIN rations ON rations.id =
herd_rations.ration_id"],
:select=>'DISTINCT ON (herd_rations.id) herd_rations.id,
herd_rations.grazing_begun, herd_rations.grazing_end, seasons.season_name,
seasons.season_start_date, seasons.season_end_date, rations.ration_name',
:conditions => ["herd_rations.herd_id=?", params[:id]])

@herd_rations_during_season.each do |herd_ration|
puts("----herd_ration: #{herd_ration.ration}") #prints nil
puts("----grazing_begun: #{herd_ration.grazing_begun}") #good
puts("---- grazing_end: #{herd_ration.grazing_end}") #good
end
[/code]

Thanks for any help!
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[Chirag Singhal]

Probably because in your select clause, you aren't selecting herd_rations.ration

[clem_c_rock]

solved the problem and feel a bit stupid but, at the same time not.

I accessed ration.ration_name by simply doing this in my loop:

[code]
herd_ration.ration_name
[/code]

The part I'm not understanding, is that when I used inspect in the loop, it
did not display any reference to to ration.ration_name:

[code]
@herd_rations_during_season.each do |herd_ration|
puts("----herd_ration: #{herd_ration.inspect}") #doesn't display
ration_name anywhere
end
[/code]

Chirag Singhal wrote:
>
> Probably because in your select clause, you aren't selecting
> herd_rations.ration
>

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[Frederick Cheung]

On Jul 9, 5:41 pm, clem_c_rock <clemr...@gmail.com> wrote:
> solved the problem and feel a bit stupid but, at the same time not.
>
> I accessed ration.ration_name by simply doing this in my loop:
>
> [code]
> herd_ration.ration_name
> [/code]
>
> The part I'm not understanding, is that when I used inspect in the loop, it
> did not display any reference to to ration.ration_name:

inspect by design only shows columns from the model's table, no matter
what other stuff you may have put in the select clause

Fred

>
> [code]
> @herd_rations_during_season.each do |herd_ration|
>         puts("----herd_ration: #{herd_ration.inspect}")   #doesn't display
> ration_name anywhere
> end
> [/code]
>
>
>
>
>
> Chirag Singhal wrote:
>
> > Probably because in your select clause, you aren't selecting
> > herd_rations.ration
>
> > --
> > You received this message because you are subscribed to the Google Groups
> > "Ruby on Rails: Talk" group.
> > To view this discussion on the web visit
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> > To post to this group, send email to rubyonra...@googlegroups.com.
> > To unsubscribe from this group, send email to
> > rubyonrails-ta...@googlegroups.com.
> > For more options, visit this group at
> >http://groups.google.com/group/rubyonrails-talk?hl=en.
>
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[clem_c_rock]

appreciate your reply Fred - you are always a great help!

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[Jeff Lewis]

For anyone that's interested .... You can inspect the model's
current attributes to see that additional data that was added in your
custom query:

...
puts("----herd_ration: #{herd_ration.attributes.inspect}")
...

Jeff

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