Make the snapshots the hashes

app/models/asciicast.rb

@@ -6,6 +6,8 @@ class Asciicast < ActiveRecord::Base
   mount_uploader :stdout, BasicUploader
   mount_uploader :stdout_timing, BasicUploader
 
+  serialize :snapshot, Hash
+
   validates :stdout, :stdout_timing, :presence => true
   validates :terminal_columns, :terminal_lines, :duration, :presence => true
 

db/migrate/20130708225200_clear_asciicast_snapshots.rb

@@ -0,0 +1,8 @@
+class ClearAsciicastSnapshots < ActiveRecord::Migration
+  def up
+    execute "UPDATE asciicasts SET snapshot = NULL"
+  end
+
+  def down
+  end
+end

spec/models/asciicast_spec.rb

@@ -117,4 +117,27 @@ describe Asciicast do
       asciicast.terminal_type.should    == terminal_type
     end
   end
+
+  describe '#snapshot' do
+    let(:asciicast) { Asciicast.new }
+
+    it 'is an empty hash initially' do
+      expect(asciicast.snapshot).to eq({})
+    end
+
+    it 'is a hash before persisting' do
+      asciicast.snapshot = { :foo => 1 }
+
+      expect(asciicast.snapshot).to eq({ :foo => 1})
+    end
+
+    it 'is a hash after persisting and loading' do
+      asciicast = build(:asciicast)
+      asciicast.snapshot = { :foo => 1 }
+      asciicast.save!
+
+      expect(asciicast.snapshot).to eq({ :foo => 1 })
+      expect(Asciicast.find(asciicast.id).snapshot).to eq({ :foo => 1 })
+    end
+  end
 end