Add method "createChildLevel" to SummaryPart

lib/models/__tests__/summaryPart.js

@@ -0,0 +1,23 @@
+var SummaryPart = require('../summaryPart');
+
+describe('SummaryPart', function() {
+    describe('createChildLevel', function() {
+        it('must create the right level', function() {
+            var article = SummaryPart.create({}, '1');
+            expect(article.createChildLevel()).toBe('1.1');
+        });
+
+        it('must create the right level when has articles', function() {
+            var article = SummaryPart.create({
+                articles: [
+                    {
+                        title: 'Test'
+                    }
+                ]
+            }, '1');
+            expect(article.createChildLevel()).toBe('1.2');
+        });
+    });
+});
+
+

lib/models/summaryPart.js

@@ -25,11 +25,24 @@ SummaryPart.prototype.getArticles = function() {
 };
 
 /**
-    Create a SummaryPart
+ * Create a new level for a new child article
+ *
+ * @return {String}
+ */
+SummaryPart.prototype.createChildLevel = function() {
+    var level       = this.getLevel();
+    var subArticles = this.getArticles();
+    var childLevel  = level + '.' + (subArticles.size + 1);
+
+    return childLevel;
+};
 
-    @param {Object} def
-    @return {SummaryPart}
-*/
+/**
+ * Create a SummaryPart
+ *
+ * @param {Object} def
+ * @return {SummaryPart}
+ */
 SummaryPart.create = function(def, level) {
     var articles = (def.articles || []).map(function(article, i) {
         if (article instanceof SummaryArticle) {