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How to save associated object in Grails?
class Employee {
        String name
        String department
    static constraints = {
    }
    public String toString() {
        name
    }
}


class Address {
    String line1
    String line2
    Employee employee

    static belongsTo = Employee

    static constraints = {
    }
}

def save = {
    def employeeInstance = new Employee(params)
    def addressInstance = new Address(params)
    if (employeeInstance.save(flush: true)) {
        flash.message = "${message(code: 'default.created.message', args: [message(code: 'employee.label', default: 'Employee'), employeeInstance.id])}"
        redirect(action: "show", id: employeeInstance.id)
    }
    else {
        render(view: "create", model: [employeeInstance: employeeInstance])
    }
}

class Employee {
    String name
    String department
    Address address

    public String toString() {
        name
    }
}

class Address {
    String line1
    String line2

    static belongsTo = [employee: Employee]
}

def employeeInstance = new Employee(params)
employeeInstance.address = new Address(params)
if (employeeInstance.save(flush: true)) {
    // your logic
}