fix #5 #7 #8 #9

package.js

@@ -1,7 +1,7 @@
 Package.describe({
   name: "msavin:usercache",
   summary: "The one simple trick that can save you millions of database requests!",
-  version: '1.0.0',
+  version: '1.0.1',
   git: "https://github.com/msavin/userCache.git",
   documentation: "README.md",
 });
@@ -14,4 +14,4 @@ Package.onUse(function(api) {
 		'ddp',
 	], 'server');
 
-});
+});

server.js

@@ -1,23 +1,31 @@
 var _original = Meteor.user;
+// check meteor version.  Be forwards compatible for future major and minor versions also.
+// Note that 1.10 < 1.8 so need to convert to 110 and 108 for comparison
+var isMeteor1_8 = Meteor.release.match(/(\d+)\.(\d+)/);
+isMeteor1_8 = (isMeteor1_8[1]*100 + isMeteor1_8[2]*1) >= 108;
 
 var _getCache = function () {
 	var result = undefined;
 	var instance = DDP._CurrentMethodInvocation.get() || DDP._CurrentPublicationInvocation.get();
-	var isMeteor1_8 = Meteor.release.match('1.8') !== null;
 
 	if (!instance.userId) {
 		return result;
 	}
 
 	var connectionId = instance.connection.id;
 	var connectionData = isMeteor1_8 ? Meteor.default_server.sessions.get(connectionId) : Meteor.default_server.sessions[connectionId];
+	// https://github.com/msavin/userCache/issues/5#issuecomment-498835713
+	if (!connectionData) {
+		return result;
+	}
 	var collectionViews = isMeteor1_8 ? connectionData.collectionViews.get('users').documents.get(instance.userId) : connectionData.collectionViews.users.documents[instance.userId];
 	var data = collectionViews && collectionViews.dataByKey || [];
 	var source = isMeteor1_8 ? Array.from(data.entries()) : Object.keys(data);
 
 	source.forEach(function (item) {
 		if (!result) {
-			result = {};
+			// ensure the _id field is included https://github.com/msavin/userCache/issues/9
+			result = {_id: instance.userId};
 		}
 		var key = isMeteor1_8 ? item[0] : item;
         result[key] = isMeteor1_8 ? item[1][0].value : data[item][0].value;
@@ -30,6 +38,17 @@ var _getField = function (doc, field) {
 	field = field.split('.');
 
 	for (var i = 0; i < field.length; i++) {
+		if (Array.isArray(doc)) {
+			// https://github.com/msavin/userCache/issues/8
+			if (!doc.length) {
+				return;
+			}
+			if (field[i] === "[]") {
+				// Skip to next field, only required if requested field is eg "emails.[].address"
+				continue;
+			}
+			doc = doc[0];
+		}
 		if (!doc[field[i]]) {
 			return;
 		}
@@ -45,28 +64,35 @@ Meteor.user = function (input) {
 	}
 
 	if (input === true) {
-		return _getCache()
+		return _getCache();
 	}
 
-
 	if (typeof input === "string") {
 		input = [input];
 	}
 
 	if (typeof input === "object") {
-		var cache = _getCache()
-		var innocent = true;
+		var cache = _getCache();
+		// some instances of _getCache() returning null inside a reactive publish (when logging out?)
+		// https://github.com/msavin/userCache/issues/5#issuecomment-498835713
+		var innocent = !!cache;
+		var fields = {}; // for storing list of required fields for later
 
 		input.forEach(function (item) {
-			if (typeof _getField(cache, item) === "undefined") {
+			fields[item] = 1;
+			if (innocent && typeof _getField(cache, item) === "undefined") {
 				innocent = false;
 			}
 		})
 
+		// console.log({innocent, input});
 		if (innocent) {
 			return cache;
 		} else {
-			return _original()
+			// fetch only the required fields to reduce data transfer
+			// https://github.com/msavin/userCache/issues/7
+			const userId = Meteor.userId();
+			return userId ? Meteor.users.findOne(userId, {fields}) : null;
 		}
 	}
 }