Fix Object.linkingObjects() across different classes

[elle-j]

What, How & Why?

When calling Object.linkingObjects() on an object linking to an object of a different object type, the following error would be generated:

<linking object type>#<linking property> is not a relationship to '<object type>'

// Example
Manufacturer#cars is not a relationship to 'Car'

Our assertion in the Object.linkingObjects() API has been corrected as well as the collectionHelpers passed when instantiating the returned Results. (It previously used the collectionHelpers from the targetProperty rather than target itself.)

Note:

• Previously existing tests were using linking objects of the same object type, thus the bug was not detected.

☑️ ToDos

• 📝 Changelog entry
• 🚦 Tests

[takameyer]

LGTM! Great fix!