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By: a guest on May 26th, 2012  |  syntax: None  |  size: 0.34 KB  |  hits: 11  |  expires: Never
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  1. Grails - Preventing a recursive one-to-many relationship
  2. class TreeNode {
  3.     String name
  4.     String description
  5.  
  6.     static hasMany = [childNodes: TreeNode]
  7. }
  8.        
  9. static constraints = {
  10.   childNodes(validator: {value, obj, errors->
  11.       if(value.contains(obj) {
  12.         errors.rejectValue('childNodes', 'Cannot contain self')
  13.       }
  14.   }
  15. }
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