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--- newdevs:angular_making_calls [2023/12/12 19:26] – add a netservice retrieve example sandbergja
+++ newdevs:angular_making_calls [2024/03/28 23:08] – [Deleting data in the database] add examples sandbergja
@@ Line 137: / Line 137: @@
 ===== Updating data in the database =====
+==== PcrudService example ====
-Examples coming soon
+The basic workflow for updating data in the database is to:
+  - Retrieve the object you wish to change.
+  - Make your changes in memory.
+  - Use the Pcrud service's ''update'' method to save the change to the database.
+The following example retrieves the item with ID #1, changes its barcode to 1234567 in memory, then saves the updated barcode to the database:
+    this.pcrud.retrieve('acp', 1)
+        .pipe(switchMap((item) => {
+            item.barcode('1234567');
+            return this.pcrud.update(item);
+    })).subscribe();
+Notice that we use the rxjs ''switchMap'' operator to switch our observable halfway through, from a `retrieve` call to an `update` call.  This helps us to avoid nesting RxJs subscriptions within each other, which can get very complicated to troubleshoot.
+==== NetService example ====
+coming soon
 ===== Deleting data in the database =====
-Examples coming soon
+==== PcrudService example ====
+As with updating objects, you will need to retrieve an object and have a copy in memory before you can delete it.  The following example searches for all shelving locations called "Microfilm" and then deletes them, one by one:
+  this.pcrud.search('acpl',
+                     {name: 'Microfilm'})
+       .pipe(switchMap((location) => {
+           return this.pcrud.remove(location);
+       })).subscribe();
+==== NetService example ====
+Here's an example of deleting record bucket #13 from the database, along with all its bucket entries (assuming the currently logged in user has the DELETE_CONTAINER permission):
+   this.net.request('open-ils.actor',
+                    'open-ils.actor.container.full_delete',
+                    this.auth.token(),
+                    'biblio',
+).subscribe(() => {
+        alert('Your bucket is gone!');
+    });
 ===== Troublsehooting OpenSRF calls in your browser =====