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@@ -33,4 +33,11 @@ exemplify also takes an optional block.  This is useful for methods you need to
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   exemplify(Chicken) {|c| c.ssn = "abc123" }
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   Chicken.exemplar    => #<Chicken:0x3136e1c @attributes={"name"=>nil, "ssn"=>"abc123", "age"=>nil}, @new_record=true>
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+Finally, you can automatically populate a field's value with an autoincrementing exemplar ID.
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+
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+  # auto populate name field
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+  exemplify Chicken, :auto_id => :name
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+  Chicken.exemplar    => #<Chicken:0x311d638 @new_record=true, @attributes={"name"=>"Chicken1", "ssn"=>nil, "age"=>nil}>
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+  Chicken.exemplar    => #<Chicken:0x311d638 @new_record=true, @attributes={"name"=>"Chicken2", "ssn"=>nil, "age"=>nil}>
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+  
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 You can also automatically save the record with ARClass.create_exemplar and ARClass.create_exemplar!.  They're just convenience methods that build an exemplar and call #save and #save! respectively.
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@@ -3,12 +3,18 @@ module ExemplarBuilder
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     count_var_name = "@@#{klass.to_s.underscore}_exemplar_count"
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     klass.send :class_variable_set, count_var_name, 0
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+    @@auto_field = options.delete(:auto_id)
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+    
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     (class << klass; self; end).class_eval do
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       default_exemplar = klass.new options
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       yield(default_exemplar) if block_given?
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       define_method(:exemplar) do |*overrides|
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         class_variable_set count_var_name, (class_variable_get(count_var_name) + 1)
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+        if @@auto_field
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+          default_exemplar.send "#{@@auto_field}=", "#{klass}#{class_variable_get(count_var_name)}"
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+        end
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+        
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         default_exemplar.attributes = *overrides
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         default_exemplar
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       end

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@@ -47,4 +47,10 @@ describe ExemplarBuilder do
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     exemplify Chicken, :name => "lame name"
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     lambda { Chicken.create_exemplar! :name => "really lame" }.should raise_error
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   end
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+  
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+  it "should allow for automatically populating an attribute based on exemplar count" do
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+    exemplify Chicken, :auto_id => :name
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+    Chicken.exemplar.name.should == "Chicken1"
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+    Chicken.exemplar.name.should == "Chicken2"
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+  end
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 end
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