From 337c487fdc329d71d3a8766072a3a7730c37641b Mon Sep 17 00:00:00 2001
From: Matt Huntington <matt.huntington@gmail.com>
Date: Wed, 24 Aug 2016 14:46:54 -0400
Subject: [PATCH] bind data by id, not index

---
 public/js/app.js | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/public/js/app.js b/public/js/app.js
index f5bb8c8..e9e0706 100644
--- a/public/js/app.js
+++ b/public/js/app.js
@@ -22,9 +22,10 @@ convertXDataPointToVisualPoint.domain([new Date('2016-1-1'), new Date('2017-1-1'
 
 var render = function(){
 	d3.json('/runs', function(error, data){
-		d3.select('svg').selectAll('circle')
-			.data(data)
-			.enter()
+		var circles = d3.select('svg').selectAll('circle').data(data, function(datum){
+			return datum.id;
+		});
+		circles.enter()
 			.append('circle')
 			.attr('r', 5)
 			.attr('cy', function(datum, index){