feat: Add parameter selectedField to script payload to determine wh…

…ich object field was selected when script was invoked (parse-community#2483)

README.md

@@ -393,6 +393,20 @@ Parse.Cloud.define('deleteAccount', async (req) => {
 });
 ```
 
+The field which the script was invoked on can be accessed by `selectedField`:
+
+```js
+Parse.Cloud.define('deleteAccount', async (req) => {
+  if (req.params.selectedField !== 'objectId') {
+    throw new Parse.Error(Parse.Error.SCRIPT_FAILED, 'Deleting accounts is only available on the objectId field.');
+  }
+  req.params.object.set('deleted', true);
+  await req.params.object.save(null, {useMasterKey: true});
+}, {
+  requireMaster: true
+});
+```
+
 ⚠️ Depending on your Parse Server version you may need to set the Parse Server option `encodeParseObjectInCloudFunction` to `true` so that the selected object in the data browser is made available in the Cloud Function as an instance of `Parse.Object`. If the option is not set, is set to `false`, or you are using an older version of Parse Server, the object is made available as a plain JavaScript object and needs to be converted from a JSON object to a `Parse.Object` instance with `req.params.object = Parse.Object.fromJSON(req.params.object);`, before you can call any `Parse.Object` properties and methods on it.
 
 For older versions of Parse Server:

src/components/BrowserCell/BrowserCell.react.js

@@ -288,7 +288,7 @@ export default class BrowserCell extends Component {
             callback: async () => {
               try {
                 const object = Parse.Object.extend(this.props.className).createWithoutData(this.props.objectId);
-                const response = await Parse.Cloud.run(script.cloudCodeFunction, {object: object.toPointer()}, {useMasterKey: true});
+                const response = await Parse.Cloud.run(script.cloudCodeFunction, {object: object.toPointer(), selectedField: this.props.field}, {useMasterKey: true});
                 this.props.showNote(response || `${script.title} ran with object ${object.id}}`);
                 this.props.onRefresh();
               } catch (e) {