FEATURE: Allow categories to be prioritized/deprioritized in search. (#7209)

lib/validators/category_search_priority_weights_validator.rb

@@ -0,0 +1,25 @@
+class CategorySearchPriorityWeightsValidator
+  def initialize(opts = {})
+    @name = opts[:name].to_s
+  end
+
+  def valid_value?(val)
+    val = val.to_f
+
+    case @name
+    when "category_search_priority_very_low_weight"
+      val < SiteSetting.category_search_priority_low_weight
+    when "category_search_priority_low_weight"
+      val < 1 && val > SiteSetting.category_search_priority_very_low_weight
+    when "category_search_priority_high_weight"
+      val > 1 && val < SiteSetting.category_search_priority_very_high_weight
+    when "category_search_priority_very_high_weight"
+      val > SiteSetting.category_search_priority_high_weight
+    end
+  end
+
+  def error_message
+    key = @name[/category_search_priority_(\w+)_weight/, 1]
+    I18n.t("site_settings.errors.category_search_priority.#{key}_weight_invalid")
+  end
+end