You could build a custom validator around something like this:

new_value.strip() # Leading/trailing white space can fool humans
if not db(
    (db[target_table][target_field==new_value) &
    (db[target_table].tenant_id==tenant_id)
).isempty():
    return new_value, error_message
return new_value, None


Read about custom validators here: 
http://web2py.com/books/default/chapter/29/07/forms-and-validators#Custom-validators
On Wednesday, June 25, 2014 2:17:06 PM UTC-4, Carlos Zenteno wrote:
>
> We cannot enforce uniqueness (unique=true) within a tenant in 
> multi-tenancy because
> the database does not know about tenants.
>
> Has anybody found a way to enforce/design uniqueness using multi-tenancy?
>
>

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