Hello,
I am going to try and explain this as best I can. I have 2 domain classes Snippet and Tag - they are reated by a Many-to-Many relationship -- they look like this
class Snippet {
static hasMany = [tags:Tag]
String title
String description
String category
String code
static constraints = {
title(blank:false, nullable:false, maxSize:30)
description(blank:true, nullable:true, maxSize:300)
category(blank:false, nullable:false)
code(blank:false, nullable:false)
tags(size:1..10)
}
}
And tag
class Tag {
static belongsTo = Snippet
static hasMany = [snippets:Snippet]
String name
static constraints = {
name(unique:true, blank:false, nullable:false)
}
boolean equals (Object other) {
name.equals(other.name)
}
}
What I am trying to do is add a constraint to the Snippet domain class so that you can't add the same Tag object twice. I am pretty unsure of how to do this. Can anyone offer assistance?
Thanks
James Hughes | Senior Software Engineer
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