Allow filtering by issues with no assigned milestone

Closes #1222

app/controllers/issues_controller.rb

@@ -145,9 +145,13 @@ class IssuesController < ApplicationController
               end
 
     @issues = @issues.where(assignee_id: params[:assignee_id]) if params[:assignee_id].present?
-    @issues = @issues.where(milestone_id: params[:milestone_id]) if params[:milestone_id].present?
     @issues = @issues.tagged_with(params[:label_name]) if params[:label_name].present?
     @issues = @issues.includes(:author, :project).order("updated_at")
+
+    # Filter by specific milestone_id (or lack thereof)?
+    if params[:milestone_id].present?
+      @issues = @issues.where(milestone_id: (params[:milestone_id] == '0' ? nil : params[:milestone_id]))
+    end
     @issues
   end
 

app/helpers/issues_helper.rb

@@ -36,4 +36,10 @@ module IssuesHelper
   def issue_tags 
     @project.issues.tag_counts_on(:labels).map(&:name)
   end
+
+  # Returns a fake Milestone-like object that can be used in a
+  # <tt>select_tag</tt> to allow filtering by issues with no assigned milestone
+  def unassigned_milestone
+    OpenStruct.new(id: 0, title: 'Unspecified')
+  end
 end

app/views/issues/index.html.haml

@@ -50,7 +50,7 @@
           = form_tag project_issues_path(@project), method: :get, class: :right  do
             = select_tag(:label_name, options_for_select(issue_tags, params[:label_name]), prompt: "Labels")
             = select_tag(:assignee_id, options_from_collection_for_select(@project.users.all, "id", "name", params[:assignee_id]), prompt: "Assignee")
-            = select_tag(:milestone_id, options_from_collection_for_select(@project.milestones.order("id desc").all, "id", "title", params[:milestone_id]), prompt: "Milestone")
+            = select_tag(:milestone_id, options_from_collection_for_select([unassigned_milestone] + @project.milestones.order("id desc").all, "id", "title", params[:milestone_id]), prompt: "Milestone")
             = hidden_field_tag :f, params[:f]
         .clearfix
   

spec/requests/issues_spec.rb

@@ -89,4 +89,36 @@ describe "Issues" do
       page.should have_content 'gitlab'
     end
   end
+
+  describe "Filter issue" do
+    before do
+      ['foobar', 'barbaz', 'gitlab'].each do |title|
+        @issue = Factory :issue,
+          author: @user,
+          assignee: @user,
+          project: project,
+          title: title
+      end
+
+      @issue = Issue.first
+      @issue.milestone = Factory(:milestone, project: project)
+      @issue.save
+    end
+
+    it "should allow filtering by issues with no specified milestone" do
+      visit project_issues_path(project, milestone_id: '0')
+
+      page.should_not have_content 'foobar'
+      page.should have_content 'barbaz'
+      page.should have_content 'gitlab'
+    end
+
+    it "should allow filtering by a specified milestone" do
+      visit project_issues_path(project, milestone_id: @issue.milestone.id)
+
+      page.should have_content 'foobar'
+      page.should_not have_content 'barbaz'
+      page.should_not have_content 'gitlab'
+    end
+  end
 end