DEV: Fix broken `Upload#base62_sha1`.

app/models/upload.rb

@@ -138,7 +138,7 @@ class Upload < ActiveRecord::Base
   end
 
   def base62_sha1
-    Upload.base62_sha1(upload.sha1)
+    Upload.base62_sha1(self.sha1)
   end
 
   def local?

spec/models/upload_spec.rb

@@ -253,6 +253,13 @@ describe Upload do
     end
   end
 
+  describe '#base62_sha1' do
+    it 'should return the right value' do
+      upload.update!(sha1: "0000c513e1da04f7b4e99230851ea2aafeb8cc4e")
+      expect(upload.base62_sha1).to eq("1Eg9p8rrCURq4T3a6iJUk0ri6")
+    end
+  end
+
   describe '.sha1_from_short_path' do
     it "should be able to lookup sha1" do
       path = "/uploads/short-url/3UjQ4jHoyeoQndk5y3qHzm3QVTQ.png"