CODEWITHSUNDEEP
grailsgrails-ormtraits
elixir
elixir

Reputation: 1442

Grails: How to write traits for domain classes?

I would to write a trait that several domain classes would share. For example I have two domain classes as such 

class Comment{

   String description

   static hasMany = [replies: CommentReply]

   String getFormattedDescription(){
        // ...
         return formattedDescription
   }
}

class CommentReply{
   String description

   Comment comment

   String getFormattedDescription(){
        // ...
         return formattedDescription
   }
}

In this case, both Comment and CommentReply have same function getFormattedDescription() which can be moved to a trait and be implemented by the two domains classes. How can I achieve this?

How do I write traits that all domain classes would implement? For example GormEntity is implemented by all domains by default.

Upvotes: 2

Views: 436

Answers (1)

Jeff Scott Brown
Jeff Scott Brown

Reputation: 27220

One way to do it is to write the trait and mark it with @Enhances('Domain').

import grails.artefact.Enhances

@Enhances('Domain')
trait YourTraitName {
    // ...
}

That will add YourTraitName to all domain classes.

In order for that to work you will need to configure the trait to be compiled in its own source set before your application code. A common way to manage that is to have the trait in a plugin (which could be part of a multi project build).

Upvotes: 1

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