What is a Mnesia record?

A Mnesia record is simply an ordinary Erlang -record, whose field names match a table's declared attributes — Mnesia doesn't introduce a separate record concept of its own, it reuses the language's existing record syntax as the shape of each row.

-record(person, {id, name, age}).

Row = #person{id = 1, name = "Ada", age = 34}.

When you call mnesia:write/1 with a #person{} record, Mnesia inspects the record's tag (person) to know which table it belongs to, and uses the first field (id) as the primary key by convention. Because it's just a tuple under the hood, you can pattern match on fields the same way you would with any other Erlang record.

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