I am not sure, but for orm, if you dont put nullable true, it throws error
for empty values.
On 16 Jun 2013 11:27, "Johnny Robeson" <notifications@github.com> wrote:

> In Resources/config/doctrine/Taxon.mongodb.xml:
>
> > @@ -28,6 +28,7 @@
> >          <field name="permalink" column="permalink" type="string" unique="true">
> >              <gedmo:slug fields="name" unique="true" />
> >          </field>
> > +        <field name="description" column="description" type="string" />
>
> i mostly just didn't want to store an empty string for the ORM
> unnecessarily. on the ODM side, it doesn't matter, it just won't exist.
>
> —
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>