--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/edge.coffee	Thu Jun 05 10:35:15 2014 +0200
@@ -0,0 +1,59 @@
+# edge.coffee
+#
+# A network edge between users in OStatus or pump.io graph
+#
+# Copyright 2013, E14N (https://e14n.com/)
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+_ = require("underscore")
+async = require("async")
+DatabankObject = require("databank").DatabankObject
+Edge = DatabankObject.subClass("edge")
+
+Edge.schema =
+  pkey: "from_to"
+  fields: [
+    "from"
+    "to"
+    "created"
+    "received"
+  ]
+  indices: [
+    "from"
+    "to"
+  ]
+
+Edge.beforeCreate = (props, callback) ->
+  if not props.from or not props.to
+    callback new Error("Need 'from' and 'to' in an edge'"), null
+    return
+  props.from_to = Edge.key(props.from, props.to)
+  props.received = Date.now()
+  callback null, props
+  return
+
+Edge::beforeSave = (callback) ->
+  edge = this
+  if not edge.from or not edge.to
+    callback new Error("Need 'from' and 'to' in an edge'"), null
+    return
+  edge.from_to = Edge.key(edge.from, edge.to)
+  edge.received = Date.now()  unless edge.received
+  callback null
+  return
+
+Edge.key = (fromId, toId) ->
+  fromId + "→" + toId
+
+module.exports = Edge