Improved hierarchical term handling#129
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When terms were inserted, they were being added to the `$mapping` cache array, but not to the `$exists` cache array. This causes `WXR::term_exists()` to fail to find any terms added so far in this import.
As each term is processed, set the term parent if the parent can be found.
If the WXR reader encounters a child term before its parent term, it cannot set the child/parent relationship at the time the child term is created. In this case, we save the parent term slug as meta on the child term. Then, after all terms are inserted, loop through and update the parent/child relationships as needed .
pbiron
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This PR does appear to correct the problem I reported in #121.
It is also better than the fix that I had prepared for that issue because it implements the $this->remapping_required['term'] processing which I hadn't done (mine required the parent term to have occurred prior to the child term in the export file). I'm not 100% sure that the new WXR_Importer::post_process_terms() method is correct but it works on all the tests that I've run. Someone with a better grip on how the rest of the remapping code works should verify this before merge.
Passing term IDs to WP as strings results in WP making new terms. For existing terms, always cast the ID as an integer to avoid this issue (and to ensure a match).
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This PR adds handling for hierarchical terms:
• Make sure that newly added terms are added to the
$existsarray and found byWXR_Importer::term_exists().• Basic term parent setting when the parent exists before the child term is created.
• Deferred term parent setting when the child term is encountered before the parent term exists.
Please let me know if you have any questions.
This is a great project, thanks for taking it on!