From 5d8b3323adddbfe389e9e4afec716a8164903b21 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Miroslav=20Bajto=C5=A1?= <miroslav@strongloop.com>
Date: Wed, 25 Mar 2015 13:47:46 +0100
Subject: [PATCH] Remove all usages of lodash.

This commit is dropping lodash in favour of hand-written implementation
based on ES5 Array methods. As a result, the size of the (unminified)
loopback browser bundle is decreased by approx 360KB.
---
 lib/jutil.js               | 13 +++++++++++--
 lib/relation-definition.js | 16 ++++++++++------
 package.json               |  1 -
 3 files changed, 21 insertions(+), 9 deletions(-)

diff --git a/lib/jutil.js b/lib/jutil.js
index 74a047b7..dc1782c8 100644
--- a/lib/jutil.js
+++ b/lib/jutil.js
@@ -1,5 +1,5 @@
 var util = require('util');
-var _ = require('lodash');
+
 /**
  *
  * @param newClass
@@ -77,7 +77,7 @@ function mixInto(sourceScope, targetScope, options) {
     var shouldOverride = options.override || !targetPropertyExists || isDelegate;
 
     if (propertyName == '_mixins') {
-      targetScope._mixins = _.union(targetScope._mixins, sourceScope._mixins);
+      mergeMixins(sourceScope._mixins, targetScope._mixins);
       return;
     }
 
@@ -86,3 +86,12 @@ function mixInto(sourceScope, targetScope, options) {
     }
   });
 }
+
+function mergeMixins(source, target) {
+  // hand-written equivalent of lodash.union()
+  for (var ix in source) {
+    var mx = source[ix];
+    if (target.indexOf(mx) === -1)
+      target.push(mx);
+  }
+}
diff --git a/lib/relation-definition.js b/lib/relation-definition.js
index 7c6b93b0..d374882a 100644
--- a/lib/relation-definition.js
+++ b/lib/relation-definition.js
@@ -6,7 +6,6 @@ var util = require('util');
 var async = require('async');
 var utils = require('./utils');
 var i8n = require('inflection');
-var _ = require('lodash');
 var defineScope = require('./scope.js').defineScope;
 var mergeQuery = utils.mergeQuery;
 var ModelBaseClass = require('./model.js');
@@ -493,11 +492,16 @@ util.inherits(ReferencesMany, Relation);
  * @returns {Array} The array of matching relation objects
  */
 function findBelongsTo(modelFrom, modelTo, keyTo) {
-  return _.pluck(_.filter(modelFrom.relations, function (rel) {
-    return (rel.type === RelationTypes.belongsTo &&
-            rel.modelTo === modelTo &&
-            (keyTo === undefined || rel.keyTo === keyTo));
-  }), 'keyFrom');
+  return Object.keys(modelFrom.relations)
+    .map(function(k) { return modelFrom.relations[k]; })
+    .filter(function(rel) {
+      return (rel.type === RelationTypes.belongsTo &&
+              rel.modelTo === modelTo &&
+              (keyTo === undefined || rel.keyTo === keyTo));
+    })
+    .map(function(rel) {
+      return rel.keyFrom;
+    });
 }
 
 /*!
diff --git a/package.json b/package.json
index 003b32ed..42cb361d 100644
--- a/package.json
+++ b/package.json
@@ -35,7 +35,6 @@
     "debug": "^2.1.1",
     "depd": "^1.0.0",
     "inflection": "^1.6.0",
-    "lodash": "~3.0.1",
     "loopback-connector": "1.x",
     "node-uuid": "^1.4.2",
     "qs": "^2.3.3",