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How do I improve these relationships (Rails Association question) ?
Im trying to make a project to practice more kinds of associations would you kindly help me understand this?
The basic idea is to have a betting game where one user generates a new bet that can only be accepted by another user (only 2 competitors assigned for each bet, the creator and the other player).
I’m thinking about 2 tables:
Normally I would just have a one to many relationship for the user that created the bet. But I’m confused about the ‘competitor’ column where another user is also a user with a user_id. How can I express this relationship better than this:
After thinking it through it doesn’t look like a good setup because I’m renaming a column where I’m storing the user_id and having a many to many ‘through’ model doesn’t make sense since it is a “only one competitor can participate in that bet”.
I was thinking about a ‘one to one through’ creating a ‘competitors’ table like so:
Could you explain to me how to build it in a better way?
Bet model would have two
belongs_to associations (one for the creator and one for the backer or however you'd like to call them):
class Bet < ApplicationRecord belongs_to :creator, class_name: 'User' belongs_to :backer, class_name: 'User' end
bets table would need two columns for the user's id. With the above snippet, you would need a
creator_id and a
And then if you wanted to access the bets from a user (created and backed bets for example) you would create two
has_many associations on the
class User < ApplicationRecord has_many :created_bets, foreign_key: 'creator_id', class_name: 'Bet' has_many :backed_bets, foreign_key: 'backer_id', class_name: 'Bet' end
Hope that makes sense.