On Jun 27, 2006, at 5:06 AM, Jerry W. Walker wrote:
On Jun 26, 2006, at 5:41 PM, Art Isbell wrote:
I believe that a distinction needs to be made between no inverse
relationship and an inverse relationship that's not marked as a
class property. By making the to-many inverse relationship not a
class property, EOF won't use it to keep the object graph
consistent (i.e., it won't fetch those 1,000,000 objects), but I
think EOF may still use this inverse relationship in ways that can
be beneficial. So I always include inverse relationships in my
eomodels but don't mark as class properties those to-many inverse
relationships that might cause unacceptable fetching activity.
Seems to work well for me.
Are you aware of any reference documentation or experimental
results to support this position?
Not really. Others have made this assertion over the years. And
I've read things like the following from the
EORelationship.anyInverseRelationship() method description:
"Searches the relationship's destination entity for any back-
referencing relationship joining on the same keys. It first looks for
a relationship defined in the model. If none is found, it looks for a
"hidden" inverse relationship that was manufactured by the Framework.
If none is found, the Framework creates a "hidden" inverse
relationship for internal use and returns that."
It seems equally likely (in my current state of ignorance) to
provide beneficial results, to simply consume extra unused
resources or to have no discernible effect.
EOF appears to use inverse relationships, be they explicit or
"hidden" (i.e., created by EOF) for some useful purpose. So if an
inverse relationship isn't explicitly defined (e.g., in an eomodel or
in custom code), EOF seems likely to create one ("hidden"). So it
doesn't seem like additional resources would be consumed by
explicitly creating inverse relationships.
Aloha,
Art
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