test and doc generateSchema

ng2-components/ng2-alfresco-datatable/src/data/object-datatable-adapter.ts

@@ -32,22 +32,26 @@ export class ObjectDataTableAdapter implements DataTableAdapter {
     private _rows: DataRow[];
     private _columns: DataColumn[];
 
-    static generateSchema(rowToExaminate: any) {
+    static generateSchema(data: any[]) {
         let schema = [];
 
-        if (typeof rowToExaminate === 'object') {
-            for (let key in rowToExaminate) {
-                if (rowToExaminate.hasOwnProperty(key)) {
-                    schema.push({
-                        type: 'text',
-                        key: key,
-                        title: key,
-                        sortable: false
-                    });
+        if (data && data.length) {
+            let rowToExaminate = data[0];
+
+            if (typeof rowToExaminate === 'object') {
+                for (let key in rowToExaminate) {
+                    if (rowToExaminate.hasOwnProperty(key)) {
+                        schema.push({
+                            type: 'text',
+                            key: key,
+                            title: key,
+                            sortable: false
+                        });
+                    }
                 }
             }
-        }
 
+        }
         return schema;
     }