Relationships plugins are “bridge” between existing context (that is already set up in a panel) and a context which you want to get from existing one. Let’s say your panel contains “Node” context and you want to get a node author (user from node:uid property). To do that you can just set up “Node author” relationship in a panel (under a “contexts” tab) and that’s all. That’s why relationships plugins are so important – they provide easy way for getting context from existing contexts. Please have a look at this post before continue reading – there is described how to create plugin integrated with ctools API which allows us to define own plugins.Read more »
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fluffy.pro. Cheap WordPress maintenance support plans Developer’s blog: Ctools: custom relationships plugin
