Implement functionality to establish relations among collections.

lib/pocket/collection.js

@@ -11,13 +11,15 @@ function Collection(name, dbPath) {
 
 Collection.prototype.put = function(id, obj, callback) {
   var self = this;
-  path.exists(self._dbPath + '/data/' + self._name, function(exists) {
+  var dir = self._dbPath + '/data/' + self._name;
+
+  path.exists(dir, function(exists) {
     if (exists) {
       writeObject();
     } else {
       // No directory exists in which to store objects in this collection.
       // Create a directory and write the object.
-      mkdirp(self._dbPath + '/data/' + self._name, 0755, function(err) {
+      mkdirp(dir, 0755, function(err) {
         if (err) { return callback(err); }
         writeObject();
       });
@@ -26,7 +28,30 @@ Collection.prototype.put = function(id, obj, callback) {
 
   function writeObject() {
     // TODO: Implement option to control pretty printing (disable by default).
-    fs.writeFile(self._dbPath + '/data/' + self._name + '/' + id + '.json', JSON.stringify(obj, null, 4), callback);
+    fs.writeFile(dir + '/' + id + '.json', JSON.stringify(obj, null, 4), callback);
+  }
+}
+
+Collection.prototype.relate = function(id, rel, refs, callback) {
+  var self = this;
+  var dir = self._dbPath + '/rel/' + self._name + '/' + id;
+
+  path.exists(dir, function(exists) {
+    if (exists) {
+      writeReferences();
+    } else {
+      // No directory exists in which to store the relations of this object.
+      // Create a directory and write the references.
+      mkdirp(dir, 0755, function(err) {
+        if (err) { return callback(err); }
+        writeReferences();
+      });
+    }
+  });
+
+  function writeReferences() {
+    // TODO: Implement option to control pretty printing (disable by default).
+    fs.writeFile(dir + '/' + rel + '.json', JSON.stringify(refs, null, 4), callback);
   }
 }