How to expand the model?
Suppose there are models: Match, Player, Team. It is necessary to display in the template all matches with the teams and the composition of the players. The "Match" model automatically reads the Team models using the foreign key and adds them to the QuerySet.
How to add there players and teams (home / guests)? Surely, it is not necessary, when transferring to a template, to separately build a sample by Player with a filter by match ID.