req.subject doesn't contain filter condition (#1974)

Author: mariayord

node.js/events.md

@@ -352,9 +352,16 @@ It can be used as input for [cds.ql](cds-ql) as follows:
 
 ```js
 SELECT.one.from(req.subject)   //> returns single object
-SELECT.from(req.subject)      //> returns one or many in array
-UPDATE(req.subject)          //> updates one or many
-DELETE(req.subject)         //> deletes one or many
+SELECT.from(req.subject)      //> returns one or all in array
+UPDATE(req.subject)          //> updates one or all
+DELETE(req.subject)         //> deletes one or all
+```
+It contains the path of the request without the filter condition. To include the filter use:
+```js
+this.before ('UPDATE', Incidents, async req => {
+    let filter = await SELECT.from (req.subject).where(req.query.UPDATE.where) //> adds filter from the request
+    let customFilter = await SELECT.from (req.subject).where(req.query.UPDATE.where).where `status.code = 'C'` //> adds filter from the request and custom filter
+})
 ```
 
 It's available for CRUD events and bound actions.