I’m trying to make a custom archive with filters (like this tutorial) on two fields. Although both fields are type=Select, just like the tutorial, one of them allows multiple values, and that seems to be causing problems. A URL like http://thinkword.com/events/?event_category=&day_of_week=Sunday (day_of_week is the field that can have multiple values for a given event) should find records – at the moment there are two events with Sunday selected. But apparently they are not found. The other field works fine with identical code – you can try http://thinkword.com/events/?event_category=worship&day_of_week= and it will work.
The second problem is that when the filter finds no matching records, get_field_object() doesn’t return the array of field information needed to to build the sets of checkboxes. I don’t know why that happens, but it happens in the tutorial, too – look at 11:05 on the video and you’ll see the checkboxes disappear (his doesn’t have an error like mine does, and I could of course prevent the error, but I want the checkboxes!).
Here is my entire in-progress template (I’m using StartUpPro theme, if that matters):
Ignore the first question – I gave up completely on allowing multiple selections, as it ran into too many problems and the case where we might need more than one is purely theoretical, so I decided to keep it simple for now.
But the second issue needs solving if I’m going to have these filters at all. As I said, the problem can easily be seen on the tutorial video at timecode 11:05, so it’s not something unique to my code. If anyone else has implemented such a filter, how did you deal with get_field_object() failing when the result set is empty? This looks like a bug in get_field_object() to me.
Okay, I finally figured this out on my own. I studied the get_field_object() function more deeply, and on this documentation page, in the “field_key vs field_name” section, there is a hint. It is not said directly, but apparently even if posts have been created that use the Field Group, if a filter causes the current query of posts (using the pre_get_posts hook) to return none of them, field_name won’t work. Even Elliot used the field_name in his tutorial, but in the case of a filter like this, you MUST use the field_key, even though it makes the code harder to read.
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