added new filters and fixed spec

app/finders/issuable_finder.rb

@@ -268,11 +268,25 @@ class IssuableFinder
   end
 
   def by_weight(items)
-    if params[:weight].present?
-      items = items.where(weight: params[:weight])
+    return items if filter_by_any_weight? || !weights?
+
+    if filter_by_no_weight?
+      items.where(weight: [-1, nil])
+    else
+      items.where(weight: params[:weight])
     end
+  end
 
-    items
+  def weights?
+    params[:weight].present?
+  end
+
+  def filter_by_no_weight?
+    params[:weight] == Issue::WEIGHT_NONE
+  end
+
+  def filter_by_any_weight?
+    params[:weight] == Issue::WEIGHT_ANY
   end
 
   def current_user_related?

app/helpers/issues_helper.rb

@@ -140,11 +140,7 @@ module IssuesHelper
   end
 
   def projects_weight_options(selected = nil)
-    options = (Issue::WEIGHT_RANGE).map do |i|
-      [i, i]
-    end
-
-    options.unshift(['Any', nil])
+    options = Issue.weight_options.map {|op| [op] * 2}
     options_for_select(options, selected || params[:weight])
   end
 

spec/features/issues/filter_by_weight_spec.rb

@@ -24,7 +24,7 @@ feature 'Issue filtering by Weight', feature: true do
     visit_issues(project)
     filter_by_weight(Issue::WEIGHT_ANY)
 
-    expect(page).to have_css('.issue', count: 1)
+    expect(page).to have_css('.issue', count: 3)
   end
 
   scenario 'filters by a specific Weight', js: true do