Grails：groovy subcollection

Question

拥有以下域类：

class Message{
}

希望获得id超过offset的所有邮件：

def offset = params.offset
def messages = Message.list()
def subMessages = messages.findAll({offset, it ->
    it.id > offset
}.curry(offset))

怎么了？

---

更新：我知道Message.list()可以Message.list(params)执行，但现在不重要了。

Answer 1

使用地图的示例

def params = [offset: 2]
def messages = [[id: 1], [id: 2], [id: 3], [id: 4], [id: 5]]
def subMessages = messages.findAll({ it.id > params.offset })
assert subMessages == [[id: 3], [id: 4], [id: 5]]

---

使用Grails域类进行集成测试

(1..5).each { new Message(text: "${it}").save(failOnError: true) }
def params = [offset: "2"]
def offset = Integer.parseInt(params.offset)
def messages = Message.list()
def subMessages = messages.findAll({ it.id > offset })
assert subMessages == Message.findAllByIdGreaterThan(offset)