class AllocationStats::AllocationsProxy

def to_a
  results = @allocations
  @wheres.each do |where|
    results = where.call(results)
  end
  # First apply group_by
  results = @group_by.call(results) if @group_by
  # Apply each mapper
  @mappers.each do |mapper|
    results = mapper.call(results)
  end
  results
end