Recursive comparison for iterable assertions not working across different classes?

[ryanmckaytx]

Hi,
The example shown here https://assertj.github.io/doc/#assertj-core-recursive-comparison-for-iterable doesn't work for me on 3.27.4. Specifically,

assertThat(doctors).usingRecursiveFieldByFieldElementComparator(configuration).contains(sheldon);

Where doctors is a List<Doctor> and sheldon is a Person, does not compile (Java 21):

error: method contains in class AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT> cannot be applied to given types;
				.contains(sheldon);
				^
  required: Doctor[]
  found:    Person
  reason: varargs mismatch; Person cannot be converted to Doctor
  where SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT are type-variables:
    SELF extends AbstractIterableAssert<SELF,ACTUAL,ELEMENT,ELEMENT_ASSERT> declared in class AbstractIterableAssert
    ACTUAL extends Iterable<? extends ELEMENT> declared in class AbstractIterableAssert
    ELEMENT extends Object declared in class AbstractIterableAssert
    ELEMENT_ASSERT extends AbstractAssert<ELEMENT_ASSERT,ELEMENT> declared in class AbstractIterableAssert

Is there a way to actually recursively compare iterables of different types?

[joel-costigliola]

The example does not compile indeed, this has been reported and fixed with #3837.

The generic types won't let you compile when types are different but as a workaround you could cast your collections to non generic ones, I haven't tried it yet but I think that could work

[ryanmckaytx]

Yes, it does work! Thank you