class GraphQL::Pagination::ActiveRecordRelationConnection

def null_relation(relation)
  if relation.respond_to?(:none)
    relation.none
  else
    # Rails 3
    relation.where("1=2")
  end
end

def relation_count(relation)
  int_or_hash = if relation.respond_to?(:unscope)
    relation.unscope(:order).count(:all)
  else
    # Rails 3
    relation.count
  end
  if int_or_hash.is_a?(Integer)
    int_or_hash
  else
    # Grouped relations return count-by-group hashes
    int_or_hash.length
  end
end

def relation_larger_than(relation, size)
  initial_offset = relation.offset_value || 0
  relation.offset(initial_offset + size).exists?
end

def relation_limit(relation)
  relation.limit_value
end

def relation_offset(relation)
  relation.offset_value
end