I explain this with an example. In my blog I have 2 users:
- John
- Paul
that write posts. Posts have 2 categories (to be precise, it's a custom taxonomy):
- Cats
- Dogs
John manages the Cats section of the blog and Paul manages the Dogs. So I want John to be able only to view/add/edit posts in "Cats" category and the same for Paul.
How can do this (preferably without the use of a plugin)?