Ruby module using arel for null-checks and time comparisons

time_splits.rb

module TimeSplits
  extend ActiveSupport::Concern

  module ClassMethods
    def not_null?(attribute)
      where(arel_table[attribute].not_eq(nil))
    end

    def in_future?(attribute, default_threshold = Time.current)
      not_null?(attribute).where(arel_table[attribute].gt(default_threshold))
    end

    def in_past?(attribute, default_threshold = Time.current)
      not_null?(attribute).where(arel_table[attribute].lt(default_threshold))
    end

    def now_or_in_past?(attribute, default_threshold = Time.current)
      not_null?(attribute).where(arel_table[attribute].lteq(default_threshold))
    end

    def now_or_in_future?(attribute, default_threshold = Time.current)
      not_null?(attribute).where(arel_table[attribute].gteq(default_threshold))
    end
  end
end