调用域名的方法，我有以下域类：的Grails：普惠制

package com.example 

class Location { 
    String state 

    def getStatesList(){ 

    def states = ['AL','AK','AZ','AR','CA','CO','CT', 
     'DC','DE','FL','GA','HI','ID','IL','IN','IA', 
     'KS','KY','LA','ME','MD','MA','MI','MN','MS', 
     'MO','MT','NE','NV','NH','NJ','NM','NY','NC', 
     'ND','OH','OK','OR','PA','RI','SC','SD','TN', 
     'TX','UT','VT','VA','WA','WV','WI','WY'] 
    return states 
    } 
}

在我的GSP，我想在选择下拉这样

<g:select name="location.state" class="form-control" from="${com.example.Location?.getStatesList()}" value="${itemInstance?.location?.state}" noSelection="['': '']" />

在显示状态列表这样做，我收到“缺少方法例外”

如果我更改列表的方法，我不会再收到错误，但我不希望这样。

from="${com.example.Location?.list()}" // works 
from="${com.example.Location?.getStatesList()}"  // does not work

任何帮助，非常感谢。

来源

2015-11-04 elixir

'getStatesList（）'应该以您尝试使用的方式声明为'static'。 – dmahapatro

正如dmahaptro所说，您可以通过使getStatesList()成为静态方法来解决此问题。

class Location { 
    String state 

    static List<String> getStatesList() { 
     ['AL','AK','AZ','AR','CA','CO','CT', 
     'DC','DE','FL','GA','HI','ID','IL','IN','IA', 
     'KS','KY','LA','ME','MD','MA','MI','MN','MS', 
     'MO','MT','NE','NV','NH','NJ','NM','NY','NC', 
     'ND','OH','OK','OR','PA','RI','SC','SD','TN', 
     'TX','UT','VT','VA','WA','WV','WI','WY'] 
    } 
}

然后你就可以执行Location.statesList或Location.getStatesList()。

替代

我认为一个更清洁的替代方案是用一个最终常数：

class Location { 
    String state 

    static final List<String> STATES = 
     ['AL','AK','AZ','AR','CA','CO','CT', 
     'DC','DE','FL','GA','HI','ID','IL','IN','IA', 
     'KS','KY','LA','ME','MD','MA','MI','MN','MS', 
     'MO','MT','NE','NV','NH','NJ','NM','NY','NC', 
     'ND','OH','OK','OR','PA','RI','SC','SD','TN', 
     'TX','UT','VT','VA','WA','WV','WI','WY'] 
}

然后你就可以访问列表以同样的方式：。不同之处在于全部大写的名称暗示了一个不会更改的值（并且不需要访问数据库）。

来源

2015-11-04 23:02:40