Provides composite regular and unique indices for Ohm.
require "ohm/composite"
class Post
include Ohm::Composite
attribute :user_id
attribute :date
attribute :slug
composite_index [:user_id, :date]
composite_unique [:user_id, :slug]
end
Post.composite_find(user_id: 1, date: Date.today)
Post.composite_with(user_id: 1, slug: "lorem-ipsum")Often times you need to find an instance by its uniqueness, or create it if it's not found.
For this purpose there's composite_with_or_create:
Post.composite_with_or_create(user_id: 1, slug: "lorem-ipsum")This is guaranteed to be contention-safe: if two competing threads or processes end up in the create branch, only one will win and the other will receive the created instance. None of them will raise exceptions nor receive nils.
See UNLICENSE. With love, from Educabilia.