tags: add /tag_versions page.

app/models/tag_version.rb

@@ -4,4 +4,39 @@ class TagVersion < ApplicationRecord
   include VersionFor
 
   version_for :tag
+
+  def self.name_matches(name)
+    where_like(:name, Tag.normalize_name(name))
+  end
+
+  def self.search(params)
+    q = search_attributes(params, :id, :created_at, :updated_at, :version, :name, :category, :is_deprecated, :tag, :updater, :previous_version)
+
+    if params[:name_matches].present?
+      q = q.name_matches(params[:name_matches])
+    end
+
+    case params[:order]
+    when "created_at", "created_at_desc"
+      q = q.order(created_at: :desc, id: :desc)
+    when "created_at_asc"
+      q = q.order(created_at: :asc, id: :asc)
+    when "updated_at", "updated_at_desc"
+      q = q.order(updated_at: :desc, id: :desc)
+    when "updated_at_asc"
+      q = q.order(updated_at: :asc, id: :asc)
+    when "id", "id_desc"
+      q = q.order(id: :desc)
+    when "id_asc"
+      q = q.order(id: :asc)
+    else
+      q = q.apply_default_order(params)
+    end
+
+    q
+  end
+
+  def category_name
+    TagCategory.reverse_mapping[category].capitalize
+  end
 end