如何从Grails中的inList约束中选择多个值？ [英] How can I select multiple values from the inList constraint in Grails?

问题描述

我创建了一个带有String属性类别的DomainClass An。在定义的约束中，此类别应该有多个（列表）值：

 类An {
 String category 
 static constraints = {
 category nullable：true，inList：[do，me，a，favor] 
} 
} 
  

在视图中显示为多个选择框：

 < g：select name =categoryfrom =$ {anInstance.constraints.category.inList}
 value =$ {anInstance？.category} 
 valueMessagePrefix =a.category
 noSelection =$ {['''：'请选择一个...'}
 multiple =multiplesize =5/> ; 
  

保存方法是标准的：

  def save = {
 def anInstance = new An（params）
 if（anInstance.save（flush：true））{
 flash.message = $ {message（..）}
 redirect（action：show，id：anInstance.id）
} else {
 render（view：create，model：[anInstance ：anInstance]）
} 
} 
  

当我选择/值，则按预期选择/显示/保存。
当我想从这个列表中选择/保存多个值时，我得到的信息是被选择的值不在列表中（default.not.inlist.message）：

 值[do，me，a，favor]的类[class An]的属性[category]不包含在列表中[[do，me，a，favor ]]。 
  

感谢任何提示。

---

编辑：

正如Mr.Cat指出的，我的一个错误是将category属性定义为 String ，而不是 List< String> 。现在选定的值显示为已选择，但错误消息（default.not.inlist.message）仍然保留。

解决方案

在选择框中选择多个项会导致在控制器中得到一个字符串列表，然后你试图将此列表存储在一个明显错误的字符串字段，具体不传递您的约束

I'm new to Grails and obviously missing something out.. but what?!

I created a DomainClass An with a String property category. In the constraints I defined, that this category should have multiple (list) values:

class An {
 String category
 static constraints = {
  category nullable: true, inList:["do", "me", "a", "favour"]  
 }
}

In the view it is shown as a multiple select box:

<g:select name="category" from="${anInstance.constraints.category.inList}" 
          value="${anInstance?.category}" 
          valueMessagePrefix="a.category"
          noSelection="${['': 'Please select one ...'}"
          multiple="multiple" size="5"/>

The save method is standard:

def save = {
 def anInstance = new An(params)
  if (anInstance.save(flush: true)){
        flash.message = "${message(..)}"
        redirect(action: "show", id: anInstance.id)
    } else {
        render(view: "create", model: [anInstance: anInstance])
    }
}

When I select/save just one value, it is selected/shown/saved as expected. When I want to select/save many values from this list, I got the message that the seleced values are not in the list (default.not.inlist.message):

Property [category] of class [class An] with value [do, me, a, favour] is not contained within the list [[do, me, a, favour]].

Any hint is appreciated.

---

EDIT:

As Mr.Cat pointed out, one of my mistakes was to define the category property as String and not List<String>. Now the selected values are shown as selected, but the error message (default.not.inlist.message) still remains.

解决方案

selecting multiple items in select box causes that in the controller you get a list of strings, and then you are trying to store this list in a single String field which is obviously wrong, and specifically doesnt pass your costraint

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