db.define_table('likes',
Field('username', 'reference auth_user'),
Field('songname', 'reference songs'),
Field('playlist_name', 'reference playlist'),
Field('unique_key', unique=True, notnull=True, compute= lambda row:
"%(username)s-%(songname)s-%(playlist_name)s"),
)
Now on any attempt to insert duplicates DAL will have an exception, because
unique_key is unique and the computation will try to add same values.
try:
db.likes.insert(......)
except:
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