Delete a book using URL

[alex-alicunde]

I'm very new to Google's DataStore.

I want to make a list of my books with a button to delete the books I want.

But for this, I need to create a route to eliminate them:

$books= new GDS\Store('Book');	
foreach($books->fetchAll() as $book)
	{
		?>
			<h2><?php echo $book->title; ?> <a href="/delete/<?php echo $book->key; ?>">Delete</a></h2>
		<?php
	}

How do I create a route with the unique ID of the book ?. Is there any way to make automatic IDs ?.

[alex-alicunde]

It is with $book->getKeyId() ?

That id is unique?

[alex-alicunde]

And another silly question. The foreign keys do not exist ?.

Do I have to create them manually and do it by php always?

[tomwalder]

If you have inserted (upserted) without specifying a Key Name, then yes - getKeyID is the unique key.

[tomwalder]

Datastore supports a hierarchical reference system - ancestry.

If you just want reference entity "X" from entity "Y", then you are usually best to just store the Key ID (or name) in a string field.