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March 10, 2010

Grails Goodness: Get Values from Parameters with Same Name

Grails supports type conversion on request parameters. But it is also easy to handle multiple request parameters with the same name in Grails. We use the list() method on the params and we are sure we get back a list with values. Even if only one parameter with the given name is returned we get back a list.

// File: grails-app/controllers/SimpleController.groovy
class SimpleController {

    def test = {
        // Handles a query like 'http://localhost:8080/simple?role=admin&role=user'
        def roles = params.list('role')
        render roles.join(',')  // Returns admin,user