Add test for updating link property (#1118)

Author: scotttrinh

docs/update.rst

@@ -117,6 +117,53 @@ In the query builder this is represented with the following syntax.
     }
   }))
 
+**Updating a single link property**
+
+.. code-block:: typescript
+
+  e.update(e.Movie, (movie) => ({
+    filter_single: { title: "The Eternals" },
+    set: {
+      actors: {
+        "+=": e.select(movie.actors, (actor) => ({
+          "@character_name": e.str("Sersi"),
+          filter: e.op(actor.name, "=", "Gemma Chan")
+        }))
+      }
+    }
+  }));
+
+**Updating many link properties**
+
+.. code-block:: typescript
+
+  const q = e.params(
+    {
+      cast: e.array(e.tuple({ name: e.str, character_name: e.str })),
+    },
+    (params) =>
+      e.update(e.Movie, (movie) => ({
+        filter_single: { title: "The Eternals" },
+        set: {
+          actors: {
+            "+=": e.for(e.array_unpack(params.cast), (cast) =>
+              e.select(movie.characters, (character) => ({
+                "@character_name": cast.character_name,
+                filter: e.op(cast.name, "=", character.name),
+              })),
+            ),
+          },
+        },
+      })),
+  ).run(client, {
+    cast: [
+      { name: "Gemma Chan", character_name: "Sersi" },
+      { name: "Richard Madden", character_name: "Ikaris" },
+      { name: "Angelina Jolie", character_name: "Thena" },
+      { name: "Salma Hayek", character_name: "Ajak" },
+    ],
+  });
+
 Bulk updates
 ^^^^^^^^^^^^
 

integration-tests/lts/update.test.ts

@@ -132,10 +132,41 @@ describe("update", () => {
     }));
     await q2.run(client);
 
+    const theAvengersCast: { name: string; character_name: string }[] = [
+      { name: data.iron_man.name, character_name: "Tony Stark!" },
+      { name: data.cap.name, character_name: "Steve Rogers!" },
+      { name: data.thanos.name, character_name: "Thanos!" },
+    ];
+
+    const q2CharName = e.params(
+      { cast: e.array(e.tuple({ name: e.str, character_name: e.str })) },
+      (params) =>
+        e.update(theAvengers, (m) => ({
+          set: {
+            characters: {
+              "+=": e.for(e.array_unpack(params.cast), (cast) =>
+                e.select(m.characters, (c) => ({
+                  "@character_name": cast.character_name,
+                  filter: e.op(c.name, "=", cast.name),
+                })),
+              ),
+            },
+          },
+        })),
+    );
+    await q2CharName.run(client, { cast: theAvengersCast });
+
     const t2 = await e
-      .select(theAvengers, () => ({ id: true, characters: true }))
+      .select(theAvengers, () => ({
+        id: true,
+        characters: () => ({ "@character_name": true, name: true }),
+      }))
       .run(client);
     assert.equal(t2?.characters.length, 3);
+    const charSet = new Set(t2.characters.map((c) => c["@character_name"]));
+    assert.ok(charSet.has("Thanos!"));
+    assert.ok(charSet.has("Tony Stark!"));
+    assert.ok(charSet.has("Steve Rogers!"));
 
     await e
       .update(theAvengers, () => ({