gistfile1.rb

[1] pry(#<MongoMapper::Plugins::Keys::Key>)> show-source @default

From: /var/www/repos/mongomapper/spec/unit/keys_spec.rb
Number of lines: 1

generator = lambda { raise Exception }
[3] pry(#<MongoMapper::Plugins::Keys::Key>)> @default.call
=> nil
[4] pry(#<MongoMapper::Plugins::Keys::Key>)> lambda { raise Exception }.call
Exception: Exception
from (pry):3:in `block in default_value'

spec.rb

  context "when loading from the database" do
    it "should not set default values for keys that already exist" do
      generator = lambda { raise Exception }
      klass = Doc do
        key :value, Integer, :default => generator
      end
      generator.should_receive(:call).exactly(2).times
      puts "Starting"
      instance = klass.create
      puts "Finding"
      instance.reload.value.should == 3

      instance.value = 4
      instance.save

      instance.reload.value.should == 4
    end
  end