Question

我有以下代码：

def bindingMap = [title: 'The Lamb Lies Down On Broadway',
                  'players[0]': [name: 'Steve Hackett'],
                  'players[1]': [name: 'Peter Gabriel'],
                  'players[2]': [name: 'Tony Banks']]

我想得到＆＃34;数组＆＃34;来自上图的球员。所以像下面这样的行就可以了：

def players = bindingMap.players
assert players == [[name: 'Steve Hackett'], [name: 'Peter Gabriel'], [name: 'Tony Banks']]

感谢您的帮助

Answer 1

在此特定地图结构中，您可以findAll其键以players开头的条目，然后从这些条目中收集value：

def bindingMap = [title: 'The Lamb Lies Down On Broadway',
                  'players[0]': [name: 'Steve Hackett'],
                  'players[1]': [name: 'Peter Gabriel'],
                  'players[2]': [name: 'Tony Banks']]

def players = bindingMap
    .findAll { key, value -> key.startsWith("players") }*.value
assert players == [
    [name: 'Steve Hackett'], [name: 'Peter Gabriel'], [name: 'Tony Banks']]

Answer 2

原始问题并不表示这是关于Grails中的参数绑定，而是问题后面的注释。由于这是你正在做的事情，这可以完成，而无需自己编写任何参数解析代码。

// grails-app/controllers/demo/DemoController.groovy
package demo

class DemoController {

    def index(MyCommand command) {

        // command.people will be populated if the request
        // includes parameters like...
        //    people[0].name=Jeff
        //    people[0].town='St. Louis'
        //    people[1].name='Matt'
        //    people[1].town='San Jose'

        // ...
    }
}

class MyCommand {
    List<People> people
}

class People {
    String name
    String town
}

与编写自己的参数解析代码相比，这有很多好处。

获取地图中包含的列表

2 个答案: