From 7d7e014bfeb785e1e142f2796b9609a6148539ab Mon Sep 17 00:00:00 2001
From: Lucas Dohmen <lucas@arangodb.com>
Date: Thu, 31 Oct 2013 16:41:49 +0100
Subject: [PATCH] Only drop vertices when dropping a graph if vertices aren't
 used elsewhere

---
 js/common/tests/shell-graph.js          | 15 +++++++++++++++
 js/server/modules/org/arangodb/graph.js |  5 ++++-
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/js/common/tests/shell-graph.js b/js/common/tests/shell-graph.js
index 7d0973cc6a..43ababc2c2 100644
--- a/js/common/tests/shell-graph.js
+++ b/js/common/tests/shell-graph.js
@@ -68,6 +68,21 @@ function GraphCreationSuite() {
       graph.drop();
     },
 
+    testDroppingIfVertexCollectionIsUsedTwice : function () {
+      var Graph = require("org/arangodb/graph").Graph,
+        graph_name = "UnitTestsCollectionGraph",
+        other_graph_name = "UnitTestsCollectionOtherGraph",
+        vertex = "UnitTestsCollectionVertex",
+        edges = "UnitTestsCollectionEdge",
+        other_edges = "UnitTestsCollectionOtherEdges",
+        graph = new Graph(graph_name, vertex, edges),
+        other_graph = new Graph(other_graph_name, vertex, other_edges);
+
+      graph.drop();
+      assertTrue(arangodb.db._collection("UnitTestsCollectionVertex") !== null);
+      other_graph.drop();
+    },
+
 ////////////////////////////////////////////////////////////////////////////////
 /// @brief test: Find Graph
 ////////////////////////////////////////////////////////////////////////////////
diff --git a/js/server/modules/org/arangodb/graph.js b/js/server/modules/org/arangodb/graph.js
index 49884cf767..06d5ae17c8 100644
--- a/js/server/modules/org/arangodb/graph.js
+++ b/js/server/modules/org/arangodb/graph.js
@@ -555,7 +555,10 @@ Graph.prototype.drop = function (waitForSync) {
 
   gdb.remove(this._properties, true, waitForSync);
 
-  this._vertices.drop();
+  if (gdb.byExample({vertices: this._vertices.name()}).count() === 0) {
+    this._vertices.drop();
+  }
+
   this._edges.drop();
 };