Hey guys! I have a question about the aggregation of several fields into one.
Taking the example of the authors, lets say I have two fields `_first_author` and `_additional_authors` and I want to aggregate then into `authors`. The common case, and the easiest, is when I have one `_first_author` and cero or more `_additional_authors`, in which case I just put a list with the authors (what else right? :-) The problem, or the question, comes when I don’t have a `_first_author` in which case I’m not sure about the content of the `authors` field, it could be i) only the list of `_additional_authors` or ii) `None` follow by the the list of `_additional_authors`. I think the second solution is the closest one to reality, the `None` express that the record doesn’t have a first author. And I also think that we could apply this solution for other cases where we have this kind of situation (like with the `110__` and `710__`). What do you think? Lars, as you have already pu in production, how do you deal with this problem? Cheers, -- Esteban J. G. Gabancho
