I have a schema with three tables: *Number*, *Article*, and *ArticleNumber*.
*ArticleNumber* is a join table. Some records in *Number* are associated
with *Article* records via the join table, and some are not. I have
defined a *many_to_many *association that allows me to filter by *Number*s
having one of a particular set of *Articles. *But, short of writing raw
SQL or doing *Number.all.select {...}*, how do I filter for *Number* records
that have no corresponding article? Neither of these work:
*Number.filter(Article: nil)*
* Number.filter(Article: [])*
*
*
Thanks.
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