ruby on rails - What DataMapper plugin gives :null property option -

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I am trying to customize a piece of code containing: 

  Property: Email, String,: Index = & gt; True,: Cord = & gt; Wrong, length = & gt; In the model definition, I get this error:  
  Logic: option: blank /usr/lib/ruby/gems/1.8/gems/ Dm-core-0.10.2 / lib / dm-core / propertiesRb: 901: /usr/lib/ruby/gems/1.8/gems/dm-core-0.10.2/lib/dm-core/property.rb : 811: In 'assert_valid_options' in 'Start' /usr/lib/ruby/gems/1.8/gems/dm-core-0.10.2/lib/dm-core/model/property.rb:51:in/your 'New' 1.8 / gemstone / DM-Core -0 0.10.2 / BbD / DM-Core / Model / Property from / lib / ruby ​​/ jems /. RB: 51: In `property ' 
 
 So I think I remember the Datamapar plugin.

I do not know of any Datamapar plugin that is : null option .

On the older versions of the DataMaper, you can see the : nullable = & gt; Want to use. False . The most recent datamaker (0.10.2) provides clear syntax : required => True . The second option is still supported, but it has been deprecated.


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