Please use the Relations instead.
This function is a great support to automatically populate a new array property in the item(s) containing a cross-reference list.
Instance a crossed list
The following example explains the function declaration.
loadXref() must be called from populateObjects() of the model (item model or list model)
In case of an item model, the declaration varies. $items becomes $item.
The given context is deciding wich columns are loaded in memory (SQL query).
If you haven't created 'object.default', then create it in prepareQuery() or use an existing profile :
The N:M tutorial is putting as this in pratice.
Usage in component
Per default, the Xref list is not loaded in the model.
You can change model state only BEFORE getItem()
Note of the conceptor
In case of list, it does globally the same job than item for the moment, but it will be impoved and optimized in future. A SQL is actually requested for every row. It could be optimized to load all concerned items at once and then dispatch them into their respective parents.