Question

I have two classes in Grails application ,Employee has hasMany(one To Many relations) for another class called Vote

class Employee {
   String employeeName   
   static hasMany = [votes:Vote]
}

and vote class has voteRank integer property, and all employees vote on scale of 1-10 and every employee contains list of these votes given by other employees

class Vote {
   Integer voteRank
   static belongsTo =[employee:Employee]
}

How do I get the avg of all votes given per employee. This can be solved in SQL by using group by clause. But i am looking for grails domain mapping and gorm oriented answer for this problem.

Answer 1

You can accomplish this with a simple method on the Employee domain class.

class Employee {
    String employeeName
    static hasMany = [votes: Vote]

    def sumVotes() {
        votes.voteRank.sum() / votes.size()
    }
}