Rails - May 2008 - list animals with average capture_percent (Josh Susser's example)

Hi guys,

I implemented self-referential system based on Josh Susser''s guidance
on http://blog.hasmanythrough.com/2007/10/ … ny-through

now I''m unsuccesfully trying to list all animals together with average
hunt.capture_percent, regardless of whether it is ''pursuit'' or
''escape'' (i am using it on sthg else than animals where it
makes sense
not to differentiate between these. i want to keep having separated
''pursuit'' and ''escape'' for future though)

i tried sthg like

<%= (animal.pursuit.average(:capture_percent)
+animal.pursuit.average(:capture_percent))/2 %>

first, this doesn''t work, while having just
<%(animal.pursuit.average(:capture_percent) %> does

second, i believe this calculation should rather be included in
controller, but i have no idea how to do it over an array, join this
array with the array of @animals and send this all to view  :-(

this might be rather stupid newbie question, but I failed to google
out an answer :-( thanks for any trace of help

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"This doesn''t work" won''t get much help.  In what
way does it fail?

As for the second part, I''d suggest using map/collect from Enumerable
to marry these in the controller if you want to move the calculation
there.  The approach really depends on what you need/want to do in the
view.  You might want to return the animal object, just it''s name,
etc. but it''d look something like this:

@animals = Animal.whatever_you_do_to_find_animals.collect{|animal|
{:animal=>animal,
:capture_rate=>animal.pursuit.average(:capture_percent)}}

Then in your view:
<table>
  <thead>
  <th><td>Animal</td><td>Captured</td></th>
  </thead>
  <tbody>
  <% @animals.each do |animal_hash| %>
    <tr><td><%= h animal_hash[:animal].name
%></td><td><%animal_hash[:capture_rate].to_s</td></tr>
  <% end %>
  </tbody>
</table>

On May 21, 8:31 am, pepa007
<richter.jo...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hi guys,
>
> I implemented self-referential system based on Josh Susser''s
guidance
> onhttp://blog.hasmanythrough.com/2007/10/… ny-through
>
> now I''m unsuccesfully trying to list all animals together with
average
> hunt.capture_percent, regardless of whether it is
''pursuit'' or
> ''escape'' (i am using it on sthg else than animals where
it makes sense
> not to differentiate between these. i want to keep having separated
> ''pursuit'' and ''escape'' for future
though)
>
> i tried sthg like
>
> <%= (animal.pursuit.average(:capture_percent)
> +animal.pursuit.average(:capture_percent))/2 %>
>
> first, this doesn''t work, while having just <%>
(animal.pursuit.average(:capture_percent) %> does
>
> second, i believe this calculation should rather be included in
> controller, but i have no idea how to do it over an array, join this
> array with the array of @animals and send this all to view  :-(
>
> this might be rather stupid newbie question, but I failed to google
> out an answer :-( thanks for any trace of help
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