or scopes - add this to your model to be able to or scopes together (eg: Model.or(Model.scope1, Model.scope2). Stolen and adapted from fake_arel

arel_or.rb

  __or_fn = lambda do |*scopes|
    where = []
    joins = []
    includes = []

    # for some reason, flatten is actually executing the scope
    scopes = scopes[0] if scopes.size == 1
    scopes.each do |s|
      w = []
      s.where_clauses.each do |where_clause|
        w << where_clause
      end
      where << w.join(" AND ")
      
      joins << s.joins_values if s.joins_values.any?
      includes << s.includes_values if s.includes_values.any?
    end
    scoped = self
    p self
    scoped = scoped.includes(includes.uniq.flatten) if includes.any?
    scoped = scoped.joins(joins.uniq.flatten) if joins.any?
    p where.join(" OR ")
    scoped.where(where.join(" OR "))
  end
  scope :or, __or_fn