Frederick Cheung wrote:
> It is a pretty fundamental assumption of Active Record that tables
> have a primary key. There is (or at least there used to be) a plugin
> out there that added support for composite primary keys
> 
> Fred

@fred: You may be right, but in that case, the documentation is wrong. 
From

http://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html

we have:

> :id - Whether to automatically add a primary key column. Defaults 
> to true. Join tables for has_and_belongs_to_many should set 
> :id => false.

And, as I hinted at, this IS a join table.

What's interesting is that I cleared the table and rebuilt it -- no 
error.  When I tried to update the entire table (with identical values), 
it gave the same error on the same record.  Curiouser and curiouser.

- ff
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