Lots of fields implement hook_field_load. OO does not. Although I don't know exactly what the benefits are, the current version at least generates an error message in Views, as reported in #1153066: Notice: Undefined offset: 0 in views_handler_field_field->set_items()...

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johnv’s picture

johnv
Primary language Dutch
commented
Status: Active » Closed (works as designed)

hook_field_load() is not necessary. The error is fixed in Views itself. See the referenced issue in OP.
It is only when you need to do special operations. We implemented it for some time in version 1.1+dev.