I'm using a custom permalink structure:
/%category%/%postname%/
So that my posts are listed like:
mysite.com/widgets/blue-widget
This works fine as long as "blue-widget" exists in one and only one category. However, when it appears in more than one category, like perhaps a child of uncategorized, the resulting URL becomes:
mysite.com/uncategorized/child-of-uncategorized/blue-widget
Even though the post is still in "widgets", it appears that there is something that makes uncategorized trump it. I believe its because it has the lower id.
I need to know if its possible to exclude uncategorized and any children of uncategorized from appearing in the permalink structure.
UPDATED EXAMPLE:
So, if a post is in 3 categories for example:
Widgets (parent_id=0), Uncategorized (parent_id=0), Child of Uncategorized (parent_id=1)
I want the filter to use "Widgets" as the permalink slug and exclude "uncategorized" and all of its children.
If the post is in 2 or more categories that are not uncategorized or a child of uncategorized, then just use the newest category as the permalink slug.
If the post is assigned solely to uncategorized or one of its children, then do not display a category slug permalink