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Tagging in Grails: many-to-many

/ Published in: Groovy
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  1. def setup = {
  2.     new User(name:'user1').save(flush:true)
  3.     new User(name:'user2').save(flush:true)
  4.  
  5.     tagsForUser1 = ['tag1','tag2']
  6.     tagsForUser2 = ['tag1']
  7.  
  8.     u1 = User.findByName('user1')
  9.     u2 = User.findByName('user2')
  10.  
  11.     //ITEM1 ***************************************************
  12.     item1 = new Taggable(name:'item1')
  13.     item1.user = u1
  14.     tagsForUser1.each {
  15.         t = Tag.findByName(it)
  16.         if(!t) {
  17.             t = new Tag(name:it).save()
  18.         }
  19.         item1.addToTags(new Tagging(user:u1,tag:t,taggable:item1))
  20.     }
  21.     item1.save(flush:true)
  22.  
  23.     //ITEM2 **************************************************
  24.     item2 = new Taggable(name:'item2')
  25.     item2.user = u2
  26.     tagsForUser2.each {
  27.         t = Tag.findByName(it)
  28.         if(!t) {
  29.             t = new Tag(name:it).save()
  30.         }
  31.         item2.addToTags(new Tagging(user:u2,tag:t,taggable:item2))
  32.     }
  33.     item2.save(flush:true)
  34. }
  35.  
  36. //setup()
  37.  
  38. t = Tag.findByName('tag1')
  39. itemsForUserAndTag = Taggable.withCriteria {
  40.     and {
  41.         eq('user', u2)
  42.         tags {
  43.             eq('tag', t)
  44.         }
  45.     }
  46. }
  47.  
  48. itemsForTag = Taggable.withCriteria {
  49.     tags {
  50.         eq('tag', t)
  51.     }
  52. }
  53.  
  54. println "Items for user and tag: $itemsForUserAndTag.name"
  55. println "Items for tag: $itemsForTag.name"

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