The Joy of Automated Tests
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Automated tests are such a joy. I have at times deleted tests but I've never regretted writing them. Today was a good reminder.
Getting the parent node of a Drupal 8+ node
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Old but mostly relevant
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There are some circumstances that you want to get data from the node one level up a menu from your current node. However, doing that is not self-explanatory since there isn't actually any direct relationship between the nodes. I'll be referring to the nodes as "parent" and "child" for simplicity despite this.