To get a recordset for library.members in a method of library.book, you need to take the following steps:

1. In the LibraryBook class, write a method called get_all_library_members:

class LibraryBook(models.Model): 
    # ... 
    @api.model 
    def get_all_library_members(self): 
        # ... 

2. In the body of the method, use the following code:

    library_member_model = self.env['library.member'] 
    return library_member_model.search([])