Support {defaultFn: 'shortid'} (#1110)

- Backport of strongloop/loopback-datasource-juggler#1107 (takeover of
strongloop/loopback-datasource-juggler#1101)
- Squashed relevant commits

lib/model.js

@@ -23,6 +23,7 @@ var utils = require('./utils');
 var fieldsToArray = utils.fieldsToArray;
 var uuid = require('node-uuid');
 var deprecated = require('depd')('loopback-datasource-juggler');
+var shortid = require('shortid');
 
 // Set up an object for quick lookup
 var BASE_TYPES = {
@@ -295,6 +296,9 @@ ModelBaseClass.prototype._initProperties = function(data, options) {
         case 'now':
           propVal = new Date();
           break;
+        case 'shortid':
+          propVal = shortid.generate();
+          break;
         default:
           // TODO Support user-provided functions via a registry of functions
           g.warn('Unknown default value provider %s', defn);

package.json

@@ -47,6 +47,7 @@
     "minimatch": "^3.0.3",
     "node-uuid": "^1.4.2",
     "qs": "^3.1.0",
+    "shortid": "^2.2.6",
     "strong-globalize": "^2.6.2",
     "traverse": "^0.6.6"
   },

test/manipulation.test.js

@@ -1573,6 +1573,27 @@ describe('manipulation', function() {
       });
     });
 
+    describe('shortid defaultFn', function() {
+      var ModelWithShortId;
+      before(createModelWithShortId);
+
+      it('should generate a new id when "defaultFn" is "shortid"', function(done) {
+        var SHORTID_REGEXP = /^[0-9a-z_\-]{7,14}$/i;
+        ModelWithShortId.create(function(err, modelWithShortId) {
+          if (err) return done(err);
+          modelWithShortId.shortid.should.match(SHORTID_REGEXP);
+          done();
+        });
+      });
+
+      function createModelWithShortId(cb) {
+        ModelWithShortId = db.define('ModelWithShortId', {
+          shortid: { type: String, defaultFn: 'shortid' },
+        });
+        db.automigrate('ModelWithShortId', cb);
+      }
+    });
+
     // it('should work when constructor called as function', function() {
     //     var p = Person({name: 'John Resig'});
     //     p.should.be.an.instanceOf(Person);