How to formulate link for Saving Relation?

Question

Yii

can you help with links? I don’t understand from the docks what to indicate there, connection, fields, model name ???
because I fill in the fields through the Books object
model:

controller:

view:

if the fields are accessed through links, it turns out like this:
books->genre
books->isbn (books->serie->book)
books->book_name
books->serie->serie_name
books- >book_year
books->serie->author (will take value from authors->author_name)
please help link om to save books->serie->book

Answer 1

Good evening.
Working with multiple models