Remove unnecessary class method Upload.exist?

app/models/upload.rb

@@ -28,15 +28,11 @@ class Upload < ActiveRecord::Base
   end
 
   def self.hexdigest(absolute_path)
-    return unless exist?(absolute_path)
+    return unless File.exist?(absolute_path)
 
     Digest::SHA256.file(absolute_path).hexdigest
   end
 
-  def self.exist?(absolute_path)
-    File.exist?(absolute_path)
-  end
-
   def absolute_path
     return path unless relative_path?
 
@@ -50,7 +46,7 @@ class Upload < ActiveRecord::Base
   end
 
   def exist?
-    self.class.exist?(absolute_path)
+    File.exist?(absolute_path)
   end
 
   private

spec/models/upload_spec.rb

@@ -102,16 +102,6 @@ describe Upload, type: :model do
     end
   end
 
-  describe '.exist?' do
-    it 'returns true when the file exists' do
-      expect(described_class.exist?(__FILE__)).to eq true
-    end
-
-    it 'returns false when the file does not exist' do
-      expect(described_class.exist?("#{__FILE__}-nope")).to eq false
-    end
-  end
-
   describe '#absolute_path' do
     it 'returns the path directly when already absolute' do
       path = '/path/to/namespace/project/secret/file.jpg'