test and doc generateSchema

ng2-components/ng2-alfresco-datatable/README.md

@@ -307,6 +307,7 @@ a custom `DataTableAdapter` using the following interfaces:
 
 ```ts
 interface DataTableAdapter {
+    generateSchema(row: DataRow): col: DataColumn;
     getRows(): Array<DataRow>;
     setRows(rows: Array<DataRow>): void;
     getColumns(): Array<DataColumn>;
@@ -363,6 +364,39 @@ let data = new ObjectDataTableAdapter(
 );
 ```
 
+## Generate schema 
+Is possible to auto generate your schema if you have only the data row  
+
+```ts
+let data =  [
+    { id: 2, name: 'abs' },
+    { id: 1, name: 'xyz' }
+];
+
+let schema = ObjectDataTableAdapter.generateSchema(data);
+
+/*Auto generated schema value:
+
+    [
+        { 
+            type: 'text', 
+            key: 'id', 
+            title: 'Id', 
+            sortable: false 
+        },
+        {
+            type: 'text', 
+            key: 'name', 
+            title: 'Name', 
+            sortable: false
+        }
+    ] 
+    
+ */
+
+```
+
+
 ## Build from sources
 
 Alternatively you can build component from sources with the following commands:

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

@@ -367,4 +367,17 @@ describe('ObjectDataRow', () => {
         expect(row.hasValue('some.other.prop')).toBeFalsy();
     });
 
+    it('should generateSchema generate a schema from data', () => {
+        let data =  [
+            { id: 2, name: 'abs' },
+            { id: 1, name: 'xyz' }
+        ];
+
+        let schema = ObjectDataTableAdapter.generateSchema(data);
+
+        expect(schema.length).toBe(2);
+        expect(schema[0].title).toBe('id');
+        expect(schema[1].title).toBe('name');
+    });
+
 });

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;
     }