Extract advanced search into a component

app/components/shared/advanced_search_component.rb

@@ -0,0 +1,31 @@
+class Shared::AdvancedSearchComponent < ApplicationComponent
+
+  private
+
+    def advanced_search
+      params[:advanced_search]
+    end
+
+    def official_level_search_options
+      options_for_select((1..5).map { |i| [setting["official_level_#{i}_name"], i] },
+                         params[:advanced_search].try(:[], :official_level))
+    end
+
+    def date_range_options
+      options_for_select([
+        [t("shared.advanced_search.date_1"), 1],
+        [t("shared.advanced_search.date_2"), 2],
+        [t("shared.advanced_search.date_3"), 3],
+        [t("shared.advanced_search.date_4"), 4],
+        [t("shared.advanced_search.date_5"), "custom"]],
+        selected_date_range)
+    end
+
+    def selected_date_range
+      custom_date_range? ? "custom" : params[:advanced_search].try(:[], :date_min)
+    end
+
+    def custom_date_range?
+      params[:advanced_search].try(:[], :date_max).present?
+    end
+end