Data relationships for a World Cup Football App

how would I map relationships for world cup football matches.

Currently in my app I have Countries, that’s it, all 32 competing
nations are represented, with flags and details working great.

I’d like to introduce two new models (Match and Stadium).

A football match is obviously between two Countries in a Stadium.

How could I set that up best?

Country
has_many Matches

Match
has_many Countries
belongs_to Stadium

Stadium
has_many Matches

Bit confused as a Match will only ever be between two sides of course.
Do I require habtm? What’s best to do here.

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