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Summary: nillable must be optional Reviewed By: alexsn Differential Revision: D17763004 fbshipit-source-id: 9c134e1648d1a387d90a5f2353de855a1aa3464f
User-Card O2O Relation Example
An example for a O2O relation between a User and Card.
In the example, a User can have only one card, and a card must have exactly one owner (required edge).
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go generate ./...