# Create an edge
	# nodes `edge.from` and `edge.to` will be created if not in base
	fun save_edge(edge: NeoEdge) do
		if edge.id != null or edge.batch_id != null then return
		# create nodes
		save_node(edge.from)
		save_node(edge.to)
		# create edge
		var job = new_job(edge)
		edge.batch_id = job.id
		job.action = create_edge_action
		job.method = "POST"
		if edge.from.id != null then
			job.to = "/node/{edge.from.id.to_s}/relationships"
		else
			job.to = "\{{edge.from.batch_id.to_s}\}/relationships"
		end
		job.body = edge.to_rest
	end