Hello, I have a system with users that can subscribe to other users. This is being modeled using many_to_many, the schemas look as below:
schema “users” do
many_to_many :subscribers, User,
join_through: UserSubscriber,
join_keys: [target_id: :id, subscriber_id: :id]
many_to_many :subscriptions, User,
join_through: UserSubscriber,
join_keys: [subscriber_id: :id, target_id: :id]
end
schema “users_subscribers” do
belongs_to :target, User
belongs_to :subscriber, User
end
My question is: Given a user, Bob, how can I fetch all users that Bob is not subscribed to? I wish to present Bob with a form where he may search for users he’s not yet subscribed to. Is there an easy way to query this in ecto or is raw sql required?
