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Drupal 7

In Drupal 7, a hook_node_access implementation could return NODE_ACCESS_IGNORE, NODE_ACCESS_ALLOW and NODE_ACCESS_DENY. If any of them returned NODE_ACCESS_DENY then access was denied. If neither did but one returned NODE_ACCESS_ALLOW then access was allowed. If neither of these values were returned by any implementation then the decision was made based on other rules but at the end of the day some code needed to grant access explicitly or access was denied. Other entities didn’t have access control.

While coding the MongoDB integration for Drupal 8 I hit a wall first with the InstallerKernel which was easy to remedy with a simple core patch but then a similar problem occurred with the TestRunnerKernel and that one is not so simple to fix: these things were not made with extensibility in mind. You might hit some other walls -- the code below is not MongoDB specific. But note how unusual this is: you won’t hit similar problems often. Drupal 8 very extensible but it has its limits.

We are currently creating a website where you have episodes. Each episode has a video which has rights attached to it. The rights are fed into the system by an XML feed. Each right has a type, a start of availability, end of availability, a price. We need to store these somewhere...

DISQUS is a popular "social commenting" platform. It is integrated with many hosted blog platforms and open source CMSes, including Drupal. A client of ours exported the comments from their old Wordpress blog and then imported them into DISQUS. The problem was that the comments were showing up in the DISQUS dashboard, however, when you clicked their corresponding URLs, these imported comments did not appear in Drupal. While the Drupal module looks for comments on the node/X URLs, DISQUS was storing them at the old Wordpress URL which were implemented as path aliases in this case.