post events: show post-related mod actions on post event page.

Show the following actions on the post events page:

* Post bans and unbans
* Post deletions and undeletions
* Thumbnail regenerations and IQDB regenerations
* Favorites moves
* Rating locks and unlocks
* Note locks and unlocks

Fixes #3825: Events/Moderation page for each post should show eventual ban actions

app/models/post_event.rb

@@ -6,16 +6,40 @@ class PostEvent < ApplicationRecord
   belongs_to :post
 
   def self.model_types
-    %w[Post PostAppeal PostApproval PostDisapproval PostFlag PostReplacement]
+    %w[Post PostAppeal PostApproval PostDisapproval PostFlag PostReplacement ModAction]
+  end
+
+  def self.categories
+    # model_types.excluding("ModAction") + ModAction.categories.keys.grep(/\Apost_(?!permanent_delete|vote)/).map(&:camelize)
+    %w[Upload Flag Appeal Approval Disapproval Delete Undelete Ban Unban Replacement Regenerate RegenerateIqdb MoveFavorites NoteLockCreate NoteLockDelete RatingLockCreate RatingLockDelete]
   end
 
   def self.visible(user)
     all
   end
 
+  def self.category_matches(category)
+    category = category.squish.titleize.delete(" ")
+
+    case category
+    when "Upload"
+      where(model_type: "Post")
+    when "Flag", "Appeal", "Approval", "Disapproval", "Replacement"
+      where(model_type: "Post" + category)
+    when *categories
+      where(model: ModAction.where(category: "post_" + category.underscore))
+    else
+      none
+    end
+  end
+
   def self.search(params, current_user)
     q = search_attributes(params, [:model, :post, :creator, :event_at], current_user: current_user)
 
+    if params[:category]
+      q = q.category_matches(params[:category])
+    end
+
     case params[:order]
     when "event_at_asc"
       q = q.order(event_at: :asc, model_id: :asc)
@@ -34,6 +58,20 @@ class PostEvent < ApplicationRecord
     [:post, :model] # XXX creator isn't included because it leaks flagger/disapprover names
   end
 
+  def category
+    if model_type == "Post"
+      "Upload"
+    elsif model_type == "ModAction"
+      model.category.camelize.delete_prefix("Post")
+    else
+      model_type.delete_prefix("Post")
+    end
+  end
+
+  def pretty_category
+    category.titleize.delete_prefix("Post ")
+  end
+
   def readonly?
     true
   end

app/policies/post_event_policy.rb

@@ -24,8 +24,13 @@ class PostEventPolicy < ApplicationPolicy
         attr = attr.to_s.gsub("creator", "uploader").to_sym if type == "Post"
         attr = attr.to_s.gsub("creator", "user").to_sym if type in "PostApproval" | "PostDisapproval"
 
-        # XXX ordering by created_at desc is a query planner hack to make Postgres use the right indexes.
-        events.where(model: type.constantize.visible_for_search(attr, user).order(created_at: :desc))
+        if type == "ModAction"
+          # XXX don't apply visible_for_search to mod actions because it's slow and we know all mod actions are visible
+          events.where(model_type: "ModAction")
+        else
+          # XXX ordering by created_at desc is a query planner hack to make Postgres use the right indexes.
+          events.where(model: type.constantize.visible_for_search(attr, user).order(created_at: :desc))
+        end
       end.reduce(:or)
     else
       events

app/views/post_events/_secondary_links.html.erb

@@ -14,4 +14,5 @@
   <%= subnav_link_to "Disapprovals", post_disapprovals_path %>
   <%= subnav_link_to "Flags", post_flags_path %>
   <%= subnav_link_to "Replacements", post_replacements_path %>
+  <%= subnav_link_to "Mod Actions", mod_actions_path(search: { subject_type: "Post" }) %>
 <% end %>

app/views/post_events/index.html.erb

@@ -11,7 +11,7 @@
       <%= search_form_for(post_events_path) do |f| %>
         <%= f.input :creator_name, label: "User", input_html: { value: params[:search][:creator_name], "data-autocomplete": "user" } %>
         <%= f.input :post_tags_match, label: "Tags", input_html: { value: params[:search][:post_tags_match], "data-autocomplete": "tag-query" } %>
-        <%= f.input :model_type, label: "Category", collection: PostEvent.model_types.map { |type| [type.titleize.delete_prefix("Post "), type] }, include_blank: true, selected: params[:search][:model_type] %>
+        <%= f.input :category, label: "Category", collection: PostEvent.categories.map { |category| [category.titleize, category] }, include_blank: true, selected: params[:search][:category] %>
         <%= f.input :order, collection: [%w[Newest event_at], %w[Oldest event_at_asc]], include_blank: true, selected: params[:search][:order] %>
         <%= f.submit "Search" %>
       <% end %>
@@ -60,11 +60,38 @@
             (<%= external_link_to model.original_url.presence || "none", Source::URL.site_name(model.original_url) || model.original_url %> ->
             <%= external_link_to model.replacement_url, Source::URL.site_name(model.replacement_url) || model.replacement_url %>).
           <% end %>
+        <% when "ModAction" %>
+          <% case model.category %>
+          <% when "post_ban" %>
+            <%= link_to post.dtext_shortlink, post %> was banned by <%= link_to_user creator %>.
+          <% when "post_unban" %>
+            <%= link_to post.dtext_shortlink, post %> was unbanned by <%= link_to_user creator %>.
+          <% when "post_delete" %>
+            <%= link_to post.dtext_shortlink, post %> was deleted by <%= link_to_user creator %>.
+          <% when "post_undelete" %>
+            <%= link_to post.dtext_shortlink, post %> was undeleted by <%= link_to_user creator %>.
+          <% when "post_regenerate" %>
+            <%= link_to post.dtext_shortlink, post %> had its thumbnails regenerated by <%= link_to_user creator %>.
+          <% when "post_regenerate_iqdb" %>
+            <%= link_to post.dtext_shortlink, post %> was reindexed in IQDB by <%= link_to_user creator %>.
+          <% when "post_rating_lock_create" %>
+            <%= link_to post.dtext_shortlink, post %> was rating locked by <%= link_to_user creator %>.
+          <% when "post_rating_lock_delete" %>
+            <%= link_to post.dtext_shortlink, post %> was rating unlocked by <%= link_to_user creator %>.
+          <% when "post_note_lock_create" %>
+            <%= link_to post.dtext_shortlink, post %> was note locked by <%= link_to_user creator %>.
+          <% when "post_note_lock_delete" %>
+            <%= link_to post.dtext_shortlink, post %> was note unlocked by <%= link_to_user creator %>.
+          <% else %>
+            <div class="prose">
+              <%= link_to_user creator %> <%= format_text(model.description.chomp(".").strip, inline: true) %>.
+            </div>
+          <% end %>
         <% end %>
       <% end %>
 
       <% t.column "Category" do |event| %>
-        <%= link_to event.model_type.titleize.delete_prefix("Post "), post_events_path(search: { model_type: event.model_type, **search_params }) %>
+        <%= link_to event.pretty_category, post_events_path(search: { category: event.category, **search_params }) %>
       <% end %>
 
       <% t.column "User" do |event| %>