FIX: Reset likeAction when updating a cached post from JSON data (#29971)

This commit addresses an issue where the like button would not be updated properly when reloading a post that lost the only like it had received.

app/assets/javascripts/discourse/app/models/post.js

@@ -63,6 +63,7 @@ function trackedPostProperty(target, propertyKey, descriptor) {
 
 export default class Post extends RestModel {
   static munge(json) {
+    json.likeAction = null;
     if (json.actions_summary) {
       const lookup = EmberObject.create();
 

app/assets/javascripts/discourse/tests/unit/models/post-test.js

@@ -116,4 +116,21 @@ module("Unit | Model | post", function (hooks) {
     );
     assert.strictEqual(post.version, 2, "the version number increased");
   });
+
+  test("likeAction", function (assert) {
+    const post = this.store.createRecord("post", {
+      id: 1173,
+    });
+
+    post.likeAction = { count: 1 };
+    assert.deepEqual(post.likeAction, { count: 1 }, "likeAction set");
+
+    // creating a new record with the same id should reset the likeAction in the original post because instance
+    // is cached and the information required to properly generate the field is not available in the new JSON data
+    this.store.createRecord("post", {
+      id: 1173,
+    });
+
+    assert.ok(post.likeAction === null, "likeAction was reset to null");
+  });
 });