如何持久化和搜索具有多个电子邮件地址的实体?

下面的代码失败了,因为email字段实际上是一个列表,我想知道如何正确/高效/惯用地处理这个应用程序引擎?

type Person struct {
    Name    string
    Company string
    Email   []EmailAddress
}

type EmailAddress {
    Type  string // home, office, etc...
    Email string
}

var items []Person
q := datastore.NewQuery("Person").Filter("Company =", company).Filter("Email = ", email).Limit(1)
_, err := a.client.GetAll(a.ctx, q, &items)

datastore: bad query filter value type: invalid Value type func() string

我是否必须执行类似拆分电子邮件地址字段的操作,即:

type Person struct {
    Name         string
    Company      string
    EmailType    []string // home, office
    EmailAddress []string // bob@work, bob@home
}