光滑3.2：从左连接表中过滤列

Question

鉴于以下使用Slick 3.2：

val contacts = TableQuery[ContactTable]
val phones = TableQuery[PhoneTable]

val query = contacts.joinLeft(phones).on(_.contact_id === _.id)

query.filter{ case (contact, maybePhone) => ... }

maybePhone是Rep [Option [PhoneTable]]。如何过滤其属性？ （像maybePhone.contains（_。areaCode ===“212”）。）

Answer 1

尝试映射：

query.filter{ case (contact, maybePhone) => maybePhone.map(_.areaCode === "212") }