Rails - Mar 2007 - Merging multiple AR result hashes into one for view loop

Need some opinions about the best way to go about this.  I
know :include does something similar, though I''m not sure if thats
what I need.

I have a Users model which :has_many of several other models, we''ll
call them model1, model2, model3 for example.

As of right now I have something like this in my controller:

@result1 = User.model1
@result2 = User.model2
@result3 = User.model3

Now the various models that belong to User have various different
columns/attributes in them, but they do share a common attribute of a
time column.

For use in one of my view I want to, for example, combine @result1,
@result2 and @result3 in one main @results hash and order them all by
time.  Then in my view I can do one simple loop such as:

for result in @results
   result.attribute_from_model1
   result.attribute_from_model2_that_isnt_in_model1
   ...
end

I suppose there is a way to do this with either a Ruby (zip?) hash
merging method or a single AR call/join.  Any thoughts? Thanks.


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Also I was thinking maybe a combo of :include and :join might work? I
can''t seem to get the syntax right.

On Mar 23, 9:43 am, "Marston A."
<mars...-8Qo2DTIsO68RmelmmXo44Q@public.gmane.org>
wrote:
> Need some opinions about the best way to go about this.  I
> know :include does something similar, though I''m not sure if thats
> what I need.
>
> I have a Users model which :has_many of several other models,
we''ll
> call them model1, model2, model3 for example.
>
> As of right now I have something like this in my controller:
>
> @result1 = User.model1
> @result2 = User.model2
> @result3 = User.model3
>
> Now the various models that belong to User have various different
> columns/attributes in them, but they do share a common attribute of a
> time column.
>
> For use in one of my view I want to, for example, combine @result1,
> @result2 and @result3 in one main @results hash and order them all by
> time.  Then in my view I can do one simple loop such as:
>
> for result in @results
>    result.attribute_from_model1
>    result.attribute_from_model2_that_isnt_in_model1
>    ...
> end
>
> I suppose there is a way to do this with either a Ruby (zip?) hash
> merging method or a single AR call/join.  Any thoughts? Thanks.

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The has_many collections aren''t hashes, they''re arrays. You
can
concatenate arrays with a + like so:

for result in User.model1 + User.model2 + User.model3
...
end

If you''re worried about their sort order, you can sort them manually
with the Array#sort_by method.

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Bryan,

Ah ok, arrays make them much easier to deal with.  Thanks I''ll give
this a try.

On Mar 23, 4:21 pm, Bryan Duxbury
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> The has_many collections aren''t hashes, they''re arrays.
You can
> concatenate arrays with a + like so:
>
> for result in User.model1 + User.model2 + User.model3
> ...
> end
>
> If you''re worried about their sort order, you can sort them
manually
> with the Array#sort_by method.
>
> --
> Posted viahttp://www.ruby-forum.com/.

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Marston A. wrote:
> Need some opinions about the best way to go about this.  I
> know :include does something similar, though I''m not sure if thats
> what I need.
> 
> I have a Users model which :has_many of several other models,
we''ll
> call them model1, model2, model3 for example.
> 
> As of right now I have something like this in my controller:
> 
> @result1 = User.model1
> @result2 = User.model2
> @result3 = User.model3
> 
> Now the various models that belong to User have various different
> columns/attributes in them, but they do share a common attribute of a
> time column.
> 
> For use in one of my view I want to, for example, combine @result1,
> @result2 and @result3 in one main @results hash and order them all by
> time.  Then in my view I can do one simple loop such as:
> 
> for result in @results
>    result.attribute_from_model1
>    result.attribute_from_model2_that_isnt_in_model1
>    ...
> end
> 
> I suppose there is a way to do this with either a Ruby (zip?) hash
> merging method or a single AR call/join.  Any thoughts? Thanks.
@result = {}
[User.model1s, User.model2s, User.model3s].each { | arr | @result.merge 
arr.index_by(&:time) }

.. then.. later on back at the farm:
@result.keys.sort.each {|key| pp @result[key] }

hope this helps..

ilan


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