@stifan
Thanks for the response.

You are right on  the request_tenant field, and I should had explained it 
better.

When you use tenants, you kind of partition the database so only the users 
of that
tenant can see the info/data of that tenant, but all the information of all 
the tenants
are in the same database.

So we cannot make a  field (another different from request_tenant) unique 
because
the database does not see the tenant "separation".

On Wednesday, June 25, 2014 4:20:38 PM UTC-5, 黄祥 wrote:
>
> please try (not tested)
> db._common_fields.append(Field('request_tenant',
>     default = request.env.http_host, writable = False, unique = True) )
>
> ref:
>
> http://web2py.com/books/default/chapter/29/06/the-database-abstraction-layer
>
> best regards,
> stifan
>

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