I want to build a filter for a custom module I built and have integrated with views. In essence, the module allows you to define types of relationships between different nodes. I'd like to create a filter for this so that I can display nodes of a certain type of relationship.
I'm not finding any documentation that describes filters in more detail and explaining the various parts to them. The API documentation is horrific in this regard.
Can anyone suggest a good resource/article on building View Filters in detail?