Uses the new field, erased_at, for erased users

spec/models/proposal_spec.rb

@@ -304,4 +304,55 @@ describe Proposal do
     end
 
   end
+
+  describe "cache" do
+    let(:proposal) { create(:proposal) }
+
+    it "should expire cache when it has a new comment" do
+      expect { create(:comment, commentable: proposal) }
+      .to change { proposal.updated_at }
+    end
+
+    it "should expire cache when it has a new vote" do
+      expect { create(:vote, votable: proposal) }
+      .to change { proposal.updated_at }
+    end
+
+    it "should expire cache when it has a new flag" do
+      expect { create(:flag, flaggable: proposal) }
+      .to change { proposal.reload.updated_at }
+    end
+
+    it "should expire cache when it has a new tag" do
+      expect { proposal.update(tag_list: "new tag") }
+      .to change { proposal.updated_at }
+    end
+
+    it "should expire cache when hidden" do
+      expect { proposal.hide }
+      .to change { proposal.updated_at }
+    end
+
+    it "should expire cache when the author is hidden" do
+      expect { proposal.author.hide }
+      .to change { [proposal.reload.updated_at, proposal.author.updated_at] }
+    end
+
+    it "should expire cache when the author is erased" do
+      expect { proposal.author.erase }
+      .to change { [proposal.reload.updated_at, proposal.author.updated_at] }
+    end
+
+    it "should expire cache when its author changes" do
+      expect { proposal.author.update(username: "Eva") }
+      .to change { [proposal.reload.updated_at, proposal.author.updated_at] }
+    end
+
+    it "should expire cache when the author's organization get verified" do
+      create(:organization, user: proposal.author)
+      expect { proposal.author.organization.verify }
+      .to change { [proposal.reload.updated_at, proposal.author.updated_at] }
+    end
+  end
+
 end