{"action":"created","comment":{"url":"https://api.github.com/repos/code-dot-org/code-dot-org/pulls/comments/46190316","id":46190316,"diff_hunk":"@@ -78,28 +78,23 @@ def Activity.recent(limit)\n   # not pass validation. The object is only written asynchronously if the gatekeeper allows it for\n   # this hostname.\n   def Activity.create_async!(attributes)\n+    activity = Activity.new(attributes)\n+    activity.created_at = activity.updated_at = Time.now\n+    activity.validate!\n+    async_op = {'model' => 'Activity', 'action' => 'create', 'attributes' => activity.attributes}","path":"dashboard/app/models/activity.rb","position":7,"original_position":7,"commit_id":"c4d062f2bb906ec5c0c2952897abda8c00bfdc20","original_commit_id":"fa5e983127ac612716963560ada425138cb66566","user":{"login":"laurelfan","id":7763,"avatar_url":"https://avatars.githubusercontent.com/u/7763?v=3","gravatar_id":"","url":"https://api.github.com/users/laurelfan","html_url":"https://github.com/laurelfan","followers_url":"https://api.github.com/users/laurelfan/followers","following_url":"https://api.github.com/users/laurelfan/following{/other_user}","gists_url":"https://api.github.com/users/laurelfan/gists{/gist_id}","starred_url":"https://api.github.com/users/laurelfan/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/laurelfan/subscriptions","organizations_url":"https://api.github.com/users/laurelfan/orgs","repos_url":"https://api.github.com/users/laurelfan/repos","events_url":"https://api.github.com/users/laurelfan/events{/privacy}","received_events_url":"https://api.github.com/users/laurelfan/received_events","type":"User","site_admin":false},"body":"cool, looks better to me than setting ids to nil for some reason :)","created_at":"2015-11-30T19:29:45Z","updated_at":"2015-11-30T19:29:45Z","html_url":"https://github.com/code-dot-org/code-dot-org/pull/5686#discussion_r46190316","pull_request_url":"https://api.github.com/repos/code-dot-org/code-dot-org/pulls/5686","_links":{"self":{"href":"https://api.github.com/repos/code-dot-org/code-dot-org/pulls/comments/46190316"},"html":{"href":"https://github.com/code-dot-org/code-dot-org/pull/5686#discussion_r46190316"},"pull_request":{"href":"https://api.github.com/repos/code-dot-org/code-dot-org/pulls/5686"}}},"pull_request":{"url":"https://api.github.com/repos/code-dot-org/code-dot-org/pulls/5686","id":52078153,"html_url":"https://github.com/code-dot-org/code-dot-org/pull/5686","diff_url":"https://github.com/code-dot-org/code-dot-org/pull/5686.diff","patch_url":"https://github.com/code-dot-org/code-dot-org/pull/5686.patch","issue_url":"https://api.github.com/repos/code-dot-org/code-dot-org/issues/5686","number":5686,"state":"open","locked":false,"title":"Create/update user_levels asynchronously.","user":{"login":"philbogle","id":5198586,"avatar_url":"https://avatars.githubusercontent.com/u/5198586?v=3","gravatar_id":"","url":"https://api.github.com/users/philbogle","html_url":"https://github.com/philbogle","followers_url":"https://api.github.com/users/philbogle/followers","following_url":"https://api.github.com/users/philbogle/following{/other_user}","gists_url":"https://api.github.com/users/philbogle/gists{/gist_id}","starred_url":"https://api.github.com/users/philbogle/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/philbogle/subscriptions","organizations_url":"https://api.github.com/users/philbogle/orgs","repos_url":"https://api.github.com/users/philbogle/repos","events_url":"https://api.github.com/users/philbogle/events{/privacy}","received_events_url":"https://api.github.com/users/philbogle/received_events","type":"User","site_admin":false},"body":"`track_user_level_progress` has been turned into an asynchronous operation, in addition to the async activity writes previously implemented.  If `Gatekeeper.allow_async_writes` is true, this means that the operation will be invoked asynchronously by adding it to the activity queue;  otherwise the async handler is immediately invoked.  (Other than how quickly the handler is invoked, the code paths are identical.)\r\n\r\nThe handler for tracking level progress ends up doing a read from the UserLevels table and a write to UserLevels and ScriptUsers.\r\n\r\nA new `AsyncProgressHandler` does the top level handling of message batches from the queue, dispatching to the Activity and User operations as appropriate for each operation.\r\n\r\n_Testing_\r\nThe ActivitiesControllerTest has been extended to verify correct handling of track_user_level_progress with async writes enabled as well as disabled.  I also manually verified that my progress was correctly preserved for a signed user across multiple browsers with async writes 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