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Dave Anderson
Dave Anderson

Reputation: 755

Persisting domain model w/ list of enums not working in GORM/Grails

My model needs to have multiple enums of the same type:

class Broker {

    static constraints = {
        brokerTypes(nullable:false)
    }

    List<BrokerType> brokerTypes
}

The model is being instantiated with the params from the request, which has in it a list of BrokerTypes:

def save(){
        def brokerInstance = new Broker(newParams)
        System.out.println(brokerInstance.getBrokerTypes().toString());
        if (!brokerInstance.save(flush: true)) {
            render(view: "create", model: [brokerInstance: brokerInstance])
            return
        }
        redirect(action: "show", id: brokerInstance.id)
}

The println prints out the list of BrokerTypes as expected, so i know that it exists in the instance. Later, the model is retrieved as follows:

def brokerInstance = Broker.findByLatAndLon(lat,lon)
System.out.println(brokerInstance.getBrokerTypes().toString());

This time the println prints out 'null'

So i imagine the problem is that GORM doesn't know how to store this list of enums, and instead when the brokerInstance.save() is called, its saving the brokerTypes field as null.

Do i need to create a mapping somehow to get GORM to recognize the list? A hack alternative would be to instead of storing the list of enums, to store a list of strings or something and then map back to the enum when needed, but this doesnt seem clean

Upvotes: 1

Views: 929

Answers (1)

Anuj Arora
Anuj Arora

Reputation: 3047

You will have to use a hasMany clause so that grails/gorm initializes a one to many relationship

You should add the following snippet to your domain class. 

   static hasMany = [brokerTypes : BrokerType]

Upvotes: 3

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