Hello all,

I have not found answers for these two questions in the manual or the
site:

1.- In a many-to-many relationship you end up with a "friendship" kind
of table, how can you avoid duplicates in that table without defining
a custom index?

2.- A typical -- not the only one -- implementation of a tree in a
RDBMS is a table with a foreign key pointing to its own primary key. I
tried something like this:

db.define_table('some',
    SQLField('name', 'string'),
    SQLField('parent', db.some))

but I get an error because db.some is not defined yet when referenced
by 'parent'.

How can you implement references to self in the DAL?

Thanks!
Jaime

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