CODEWITHSUNDEEP
classgrailsgroovy
Jack BeNimble
Jack BeNimble

Reputation: 36713

Groovy / Grails - How to get class instance from String?

I'm trying to derive the class instance of a groovy class from the name of string.

For example, I'd like to do some code along these lines:

def domainName

domainName = "Patient"

// but following line doesn't work, domainName is a String
def domainInstance = domainName.get(1);

Upvotes: 11

Views: 7494

Answers (3)

Kico Lobo
Kico Lobo

Reputation: 4404

Well,

  1. Try to implement your code using packages

  2. Try this code: I don't know if it will work ok?

def domainInstance = Class.forName("Patient").newInstance()

Upvotes: -3

Jean Barmash
Jean Barmash

Reputation: 4789

This will work: 

   Class.forName("Patient",  false, Thread.currentThread().contextClassLoader).get(1)

Upvotes: 2

noah
noah

Reputation: 21519

The Grails way would be to use GrailsApplication#getArtefact. e.g.,

def domainInstance = grailsApplication.getArtefact("Domain",domainName)?.
        getClazz()?.get(1)

The advantage of doing it this way as opposed to Class.forName is that if there is no domain class with that name, getArtefact just returns null instead of throwing an exception.

Upvotes: 23

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