Rails - Jan 2011 - Comment.all returns array of what?

I have a bad feeling asking this but I did not manage to find an answer 
myself :/

@comments = Comment.all
@comments is an array. 
I can for example access comment.created_at directly, or I could do:
<% @comments.each do |comment| %>
   <%= debug comment["created_at"] %>
<% end %>

I expected comment to be a hash, but comment.keys or comment.values fail, as 
well as an each_pair approach.
[I was actually trying to do a debug output printing all columns and columns 
names]

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bourne wrote in post #976264:
> I have a bad feeling asking this but I did not manage to find an answer
> myself :/
>
> @comments = Comment.all
> @comments is an array.
> I can for example access comment.created_at directly, or I could do:
> <% @comments.each do |comment| %>
>    <%= debug comment["created_at"] %>
> <% end %>
>
> I expected comment to be a hash, but comment.keys or comment.values
> fail, as
> well as an each_pair approach.
> [I was actually trying to do a debug output printing all columns and
> columns
> names]
Is Comment an ActiveRecord subclass?  If so, then its instances aren''t 
hashes.  Check out the docs for ActiveRecord::Base; the attributes 
method may be particularly useful.

Best,
-- 
Marnen Laibow-Koser
http://www.marnen.org
marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org

Sent from my iPhone

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On Thu, Jan 20, 2011 at 2:04 PM, bourne
<bourne7-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> I have a bad feeling asking this but I did not manage to find an answer
> myself :/
>
> @comments = Comment.all
> @comments is an array.
> I can for example access comment.created_at directly, or I could do:
> <% @comments.each do |comment| %>
>    <%= debug comment["created_at"] %>
> <% end %>
>
> I tried doing what you are doing and It works. Try this in the console:
Comment.all.each { |comment| puts comment["created_at"] }

Don''t know what debug does, but the above code works.

> I expected comment to be a hash, but comment.keys or comment.values fail,
> as well as an each_pair approach.
> [I was actually trying to do a debug output printing all columns and
> columns names]
>
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> .
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Thanks Marnen for the pointer to the attributes method!

For the archives:
<% @comments.each do |comment| %>
   <% comment.attributes.each_pair do |key, value| %>
          <%= key %>: <%= value %><br />
   <% end %>
<% end %>

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Please quote when replying.

bourne wrote in post #976269:
> Thanks Marnen for the pointer to the attributes method!
>
> For the archives:
> <% @comments.each do |comment| %>
>    <% comment.attributes.each_pair do |key, value| %>
>           <%= key %>: <%= value %><br />
>    <% end %>
> <% end %>
You''re welcome!  That looks like it will do what you want (but if
you''re
not using Rails 3, remember to put in appropriate HTML escaping). Other 
possibilities:
* Just use comment.attributes.inspect
* Instead of looping explicitly through comments, use render :partial, 
:collection

Also, if you do this a lot (i.e. more than once or twice), build a 
helper.

Oh, and consider using Haml instead of ERb...it''s a lot nicer.

Best,
--
Marnen Laibow-Koser
http://www.marnen.org
marnen-sbuyVjPbboAdnm+yROfE0A@public.gmane.org

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