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Due to a recent update of Drupal core, I'm getting the following error:

Notice: Undefined index: taxonomy_term in taxonomy_field_formatter_view() (line 1601 of taxonomy.module)

Now, this is caused because the core taxonomy hook taxonomy_field_formatter_view() has an argument called $items that expects an array of values that have two elements: tid, a numeric value, and taxonomy_term which is the taxonomy term object.

In the case of my code, each array in $items is missing the taxonomy_term element.

Now a simple fix would be to hack core and simply set $item['taxonomy_term'] = taxonomy_term_load($item['tid']) if it doesn't already exist. But of course, hacking core is a no-no so I'm trying to find a way to catch the $items argument for taxonomy_field_formatter_view() before it is passed to this hook.

What's the approach here? Would defining hook_field_formatter_view() in a custom module and fixing the $items argument work? Presumably not because the core hook is going to fall over first, so I'll need to modify it before it's passed into these hooks?

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Implement hook_module_implements_alter and replace taxonomy_field_formatter_view() to your function.

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I'd advise to use one of the Field formatter API hooks before modifying a Drupal core hook, even with hook_module_implements_alter, you might get unpleasant surprises if someone else is using it.

What I'd do is to prepare your items using hook_field_formatter_prepare_view and as it's passed by reference, it should arrive fine to your formatter_view.

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