I added a few more test cases to account for polymorphic STI associations, 
so it should be ready for re-review.

- Pete

On Tuesday, August 7, 2012 9:40:11 PM UTC-4, Peter Brown wrote:
>
> Josh,
>
> I appreciate the feedback. The consensus was that adding polymorphic 
> support would have the most value so I went ahead and added support for the 
> cases I could think of. I was hoping you could take a look at the test 
> cases<https://github.com/beerlington/rails/blob/0df2f082005ce0f57a544c30c646d1bae45bbcf8/activerecord/test/cases/relation/where_test.rb#L24-50>
>  I 
> wrote and see if they're what you had in mind.
>
> Thanks!
>
> - Pete
>
> On Tuesday, August 7, 2012 10:28:04 AM UTC-4, Josh Susser wrote:
>>
>>  I think this makes a lot of sense. I tried to do this for the old 
>> find_by_x dynamic finders a few years ago but was thwarted by the amount of 
>> refactoring it would require. Using association names instead of the 
>> underlying foreign key is more natural and keeps things at the right level 
>> of abstraction, and is especially helpful for polymorphic associations. If 
>> the new ARel-based query API enables this to be done without changing a 
>> bunch of other things, I'm all for it. 
>>
>> --
>> Josh Susser
>>
>> On Tuesday, August 7, 2012 at 8:23 AM, Peter Brown wrote:
>>
>> Hi,
>>
>> Guillermo asked me to post this here for feedback: 
>> https://github.com/rails/rails/pull/7273
>>
>> The pull request has some examples and rationale for the change, but 
>> basically it would let you *specify the model name in queries when you'd 
>> normally use a foreign key*. 
>>
>> These queries would then be equivalent:
>>
>> Post.where(:author_id => author)
>> Post.where(:author => author)
>>
>> and so would these:
>>
>> Author.where(:posts => {:author_id => author}).joins(:posts)
>> Author.where(:posts => {:author => author}).joins(:posts)
>>
>> TL;DR
>>
>>    - API is more consistent with other parts of ActiveRecord
>>    - Works with polymorphic relationships
>>    - Better for legacy schemas that don't follow Rails' foreign key 
>>    conventions (you don't need to remember column names)
>>
>>  -- 
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>>  
>>  

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