I can't seem to find any resources which tell me how to do the
following.  When I write some content to a table in my database (mysql),
I want to retrieve the id of the newly inserted record; an equivalent of
select @@IDENTITY from sometable.  How can I do this in ruby?

In my code, I have a hash:

params[:customer] = row.to_hash
@customer = @asset.customers.build(params[:customer])

# now I want to store, in table x, the id of this record which was just
inserted into the customers table.
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