Hi, I am looking to understand how I can back refe...

# exposed

[Phil Richardson]

Hi,
I am looking to understand how I can back reference in entities.
I note we have (optional)BackReferencedOn for use in my entity, but there is scant examples out there.
I note issue 583 covering an example of this, but it doesn't seem anything got back into the Wiki

It states

... you expect zero or one additional info for a user, but every info has user

It should be expected to be a 1-to-1 mapping only

The wider crux of this means the following expanded knowledge
For 1-to-1 mapping
Use (optional)BackReferencedOn on the entity that will always exist
Use referencedOn on the entity that may or may not exist, but will never exist unless the parent does
Accessing either value in a entity will only ever return a single entity (or null depending on use)

For 1-to-many mapping
Use referrersOn the left hand side entity - The 1 entity, that can have many children refer to it - Its value in a entity will be a list (0 or more entries)
Use referencedOn the right hand side entity - The many entities, that can refer to a single parent entity - Its value will be a entity (always 1)

Is this (weird, if convoluted) interpretation correct?