Quote:
Originally Posted by Sghrn
Hi there.
I'd like to put bunches of ebooks into user-categories for university.
Okay, after a while i get a clue of how to handle this. But there is a problem I couldn't solve until now. I'm just unable to put SINGLE books of an author into the user-category. Everytime, calibre takes all writings of the authors to the particular folders.. I cant imagine that there is no solution, right? 
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If you put an author into a user category, then you get all books by that author. Same thing for series, tags, etc. Searching for a category finds all books with field:value matches for the items in the user category.
If you want to put a single book into a user category, then you must create a category with unique values for every book. One solution for that is to create a composite column (column built from other columns) with the template "{id}" and the 'show in tags browser' check box checked. The ID is the database ID and is guaranteed to be unique. The result is a category with one unique entry per book. Dragging that value to a user category will effectively add the book to the category, since there can be only one book that matches a given id.
Do note that composite columns can be slow on large libraries, especially when 'show in tags browser' is checked.