implementation of measurement fields

api/sample.yaml

@@ -42,12 +42,14 @@
         schema:
           type: boolean
         example: false
-      - name: fields
+      - name: fields[]
         description: the fields to include in the output as array, defaults to ['_id','number','type','batch','material_id','color','condition','note_id','user_id','added']
         in: query
         schema:
-         type: string
-        example: '&fields[]=number&fields[]=batch'
+         type: array
+         items:
+           type: string
+        example: ['number', 'batch']
     responses:
       200:
         description: samples overview (if the csv parameter is set, this is in CSV instead of JSON format)