Return calculated (none ORM mapped) property for a resource

[vsobolmaven]

Does eve-sqlalchemy allow to define an attribute on a resource class and return it in a result for GET request if the attribute is not mapped to ORM? e.g.

class ClassX(Base):
  @property
  def my_property(self)
     return "abracadabra"

registerSchema('res')(ClassX)

schema['schema']['my_property'] = {
  'type': 'string'
}

I need the property value as part of response with resource. Is this supported? Thanks!

[mandarvaze]

I am able to return additional attribute that is not mapped to ORM But I am not using the style you suggested above. Instead I am using on_fetched hook to append additional attributes to the response.

[dkellner]

Instead of using the on_fetched hook you can add the column to the projection, too.

[mandarvaze]

@dkellner Can you give an example how projection could be used to "insert" additional data that is not part of the DB ?

[dkellner]

Extending trivial.py:

class People(Base):
    # ...
    @property
    def foo(self):
        return "bar"

SETTINGS['DOMAIN']['people']['datasource']['projection']['foo'] = 1

If you want to add fields that are not part of the People class, you're out of luck with projections. In this case you have to resort to the event system.