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Contents
# frozen_string_literal: true
require "active_support/concern"
module Decidim
# A concern with the components needed when you want a model to have a component.
module Randomable
extend ActiveSupport::Concern
class_methods do
# Public: Randomly orders a collection given a seed.
def order_randomly(seed)
transaction do
connection.execute("SELECT setseed(#{connection.quote(seed)})")
# Include the record IDs as a base number for the order calculation
# in order to avoid PostgreSQL random ordering when the records are
# updated. PostgreSQL can randomly change the base ordering in case
# the records are changed which is not desired as we want consistent
# orders for the records.
order(arel_table[primary_key] * Arel.sql("RANDOM()")).load
end
end
end
end
end
Version data entries
53 entries across 53 versions & 1 rubygems