Question

I have User class:

class User {
       static hasMany = [ project: Project ]
}

and Project:

class Project {
     static hasMany = [ users : User ]
     static belongsTo = User
}

Anywhere in my code I can do this :

user.project

will return something like :

[project name]

I need a way to delete this relationship for any User. How can I do that? I can find a user project using dynamic finders, criteria query so on, but how do I remove that relationship from a user instance?

Very new to Grails.

Thanks in advance.

Answer 1

Use removeFrom. Example:

user.removeFromProject(project)

In many-to-many relationships, you should manage the associations from the owning side: the one that is the target of the belongsTo.

Note that it would probably be more clear to name the Project association “projects” instead of “project”, since it’s a many-to-many relationship.