adds scope & boolean method for retired proposals

app/models/proposal.rb

@@ -42,6 +42,7 @@ class Proposal < ActiveRecord::Base
   scope :sort_by_relevance,        -> { all }
   scope :sort_by_flags,            -> { order(flags_count: :desc, updated_at: :desc) }
   scope :last_week,                -> { where("proposals.created_at >= ?", 7.days.ago)}
+  scope :retired,                  -> { where.not(retired_at: nil) }
 
   def to_param
     "#{id}-#{title}".parameterize
@@ -105,6 +106,10 @@ class Proposal < ActiveRecord::Base
     user && user.level_two_or_three_verified?
   end
 
+  def retired?
+    retired_at.present?
+  end
+
   def register_vote(user, vote_value)
     if votable_by?(user)
       vote_by(voter: user, vote: vote_value)

spec/models/proposal_spec.rb

@@ -741,4 +741,23 @@ describe Proposal do
     end
   end
 
+  describe "retired" do
+    before(:all) do
+      @proposal1 = create(:proposal)
+      @proposal2 = create(:proposal, retired_at: Time.now)
+    end
+
+    it "retired? is true" do
+      expect(@proposal1.retired?).to eq false
+      expect(@proposal2.retired?).to eq true
+    end
+
+    it "scope retired" do
+      retired = Proposal.retired
+
+      expect(retired.size).to eq(1)
+      expect(retired.first).to eq(@proposal2)
+    end
+  end
+
 end