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Add a /user_actions page. This page shows you a global timeline of (almost) all activity on the site, including uploads, comments, votes, edits, forum posts, and so on. The main things it doesn't include are post edits, pool edits, and favorites (posts and pools live in a separate database, and favorites don't have the timestamps we need for ordering). This page is useful for moderation purposes because it lets you see a history of almost all of a user's activity on a single page. Currently this page is mod-only. In the future it will be open to all users, so you can view the history of your own site activity, or the activity of others.
Helpers
This directory contains helper functions used by views. Helpers are used for simple common functions, such as linking to users or formatting timestamps.
Helper functions are globals. If you see an unnamespaced function in a view, and it's not a Rails function, then it's probably a helper defined here.
All helper functions defined in this directory are globally available to all views. They're not limited to single views. For example, the functions in posts_helper.rb are available to all views, not just to app/views/posts.
The use of helper functions should be minimized. Partials or components are preferred for more complex widgets, or for things used in only one or two places. Helper functions should be limited to very simple things used in nearly all views.