Two filelds in model with references to the same model

Question

I have Match model and I have Player model. Now I want to add to Match two fields like: playerone and playertwo . I want to playerone have a reference to specific Player object and playertwo have a reference to another Player object too.

I was trying something like that:

rails g model Match player:references

but this way I am able to create only one field. And I can't create custom name for this field.

Or I can just create playerone:integer filed and puts here player's id (in controller). But is it ok?

Answer 1

If you are always going to have only 2 players per match, its fine to create player_one_id:integer and player_two_id:integer fields. In the Match model, you will just have

has_one :player_one, class_name: 'Player', primary_key: :player_one_id
has_one :player_two, class_name: 'Player', primary_key: :player_two_id

You can then just set these from a form

<%= f.collection_select :player_one_id, Players.all, :id, :name %>
<%= f.collection_select :player_two_id, Players.all, :id, :name %>

Or programatically

@match.player_one = Player.find(1)
@match.player_two = Player.find(2)

The model cmdline generator for this model would look something like this

rails g model Match player_one_id:integer:index player_two_id:integer:index