I have seen that use case before. I'm not sure how we could make the API to be 
user-friendly enough for a subquery though. I think your current implementation 
is good enough while still able to use ARel.

-Prem

> On Dec 14, 2015, at 10:25 AM, Francisco Soto <[email protected]> wrote:
> 
> In certain type of queries (filtering, reporting, etc) it is common have a 
> subquery to select from, currently supported with from, and to join into 
> subqueries (inline views) which is not supported.
> 
> I just ran into said situation which I had to solve by doing the subquery as 
> a relationship and calling to_sql and then using the string form of joins.
> 
> Like:
> 
>    subquery = SomeTable
>                 .scope
>                 .scope
>                 .group(:whatever)
>                 .having("something")
>                 .to_sql
> 
>    OtherTable.joins("INNER JOIN (#{subquery}) PT ON PT.ID = other_tables.id")
> 
> Would it be possible to implement (or take a PR?) support for this case?
> 
> Best regards,
> 
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