当用户离开表单字段为空时，用正确的参数重新呈现视图的问题 [英] Problems re-rendering a view with correct params when a user leaves form fields blank

问题描述

我在<$ c $的< g：select> 标记中使用了 noSelection c> Account 字段为我的加载 创建视图。当用户没有做出选择并点击创建按钮时，我希望所有表单字段的当前值被传递给 save 闭包在我的加载控制器，然后再调用 create 视图并使用前面提到的当前值填充该视图。这不会发生在我的两个表单字段，我不清楚为什么。

以下是 Load < code $ /> c code> create 由 / truckingmanagement / load / create 控制器调用的视图看起来像：

如果用户没有在帐户字段中进行选择，然后继续单击创建按钮，则显然无法创建负载。以下是由 / truckingmanagement / load / save 调用的结果 Load create / code>控制器看起来像：



所以我在这里有两个问题，第一个是 Logged By 字段未使用在第一个视图中选择的值填充。此外，下拉框完全是空的，没有用户可以选择。第二个问题是帐户字段下拉框完全是空的，没有帐户可供选择。





以下是用于记录的和<$ c的< g：select> Load create 视图中的$ c> Account 字段。

记录者字段：

  < g：select name =loggedBy.idfrom =$ {loggedByUsers}optionKey =idvalue =$ {loadInstance？.loggedBy？.id}/> 
  

帐户栏位：

 < g：select id =accountname =account.idfrom =$ {accountsWithCargoDestinations}optionKey =idnoSelection =[''：' -  Select-']/> 
  

以下是创建和 save 在我的 LoadController 中关闭：

 角色role2 = Role.findByAuthority（ROLE_OFFICE_PROFESSIONAL）
 ）
 def loggedByUsers = UserRole.findAllByRoleInList（[role1，role2，role3]）。user 
 $ b $ def loadInstance = new Load（）
 loadInstance.properties = params 
 
 def accountsWithCargoDestinations = Account.findAllByUserInList（Address.findAll（from Address as addresses where addresses.cargoDestination = true）。user）
 
 return [loadInstance：loadInstance，loggedByUsers：loggedByUsers， accountsWithCargoDestinations：accountsWithCargoDestinations] 
} 
 $ b $ def save = {
 def loadInstance = new Load（params）
 if（loadInstance.save（flush：true））{
 flash.message =$ { （code：'default.created.message'，args：[message（code：'load.label'，default：'Load'），loadInstance.id]）}
 redirect（action：show ，id：loadInstance.id）
} 
 else {
 System.out.println params //尝试查看问题字段中的任何值是否丢失。 
 render（view：create，model：[loadInstance：loadInstance]）
} 
} 
  

您会注意到 println 语句中的 else 部分 save closure打印出 params 。当我这样做时，我发现在第一个视图中的 Logged By 字段中选择的值确实从第一个视图一路传递到了这一点，但我不知道不知道为什么当 Load create 视图显示在下一行代码中时不显示它，或者至少为什么 （即 loggedByUsers 来自 truckingmanagement / load / create 控制器）渲染视图时不会填充 Logged By 字段。任何帮助将不胜感激，抱歉的冗长。

解决方案

回答您在评论回复中提出的问题。您可能想要在控制器中使用 chain 进行调查。如果模型中尚未存在新的loadInstance，则需要稍微重新创建您的创建操作。但是，这应该会有诀窍。

I am using a noSelection attribute in the <g:select> tag of the Account field for my Load create view. When a user does not make a selection and clicks the "Create" button I expect the current values of all form fields to be passed to the save closure in my Load controller, which in turn re-calls the create view and populates that view with the previously mentioned current values. This does not happen for two of my form fields and I am unclear why.

Here is what the Load create view called by the /truckingmanagement/load/create controller looks like:

If a user does not make a selection on in the Account field and then proceeds to click the "Create" button, a load obviously cannot be created. Here is what the resulting Load create view called by the /truckingmanagement/load/save controller looks like:

So I have two issues here, the first of which is that the Logged By field in the second view is not populated with the value selected in the first view. Also, the drop down box is completely empty, there are no users to select from. The second issue is that the Account field drop down box is completely empty, there are no accounts to select from.

Here are the <g:select> tags used for the Logged By and Account fields in the Load create view.

Logged By field:

<g:select name="loggedBy.id" from="${loggedByUsers}" optionKey="id"  value="${loadInstance?.loggedBy?.id}" />

Account field:

<g:select id="account" name="account.id" from="${accountsWithCargoDestinations}" optionKey="id" noSelection="['':'-Select-']" />

Here are the create and save closures in my LoadController:

def create = {
    Role role1 = Role.findByAuthority("ROLE_ADMIN")
    Role role2 = Role.findByAuthority("ROLE_OFFICE_PROFESSIONAL")
    Role role3 = Role.findByAuthority("ROLE_DRIVER")   
    def loggedByUsers = UserRole.findAllByRoleInList([role1, role2, role3]).user

    def loadInstance = new Load()
    loadInstance.properties = params

    def accountsWithCargoDestinations = Account.findAllByUserInList(Address.findAll("from Address as addresses where addresses.cargoDestination=true").user)

    return [loadInstance:loadInstance, loggedByUsers:loggedByUsers, accountsWithCargoDestinations:accountsWithCargoDestinations]
}

def save = {
    def loadInstance = new Load(params)
    if (loadInstance.save(flush: true)) {
        flash.message = "${message(code: 'default.created.message', args: [message(code: 'load.label', default: 'Load'), loadInstance.id])}"
        redirect(action: "show", id: loadInstance.id)
    }
    else {
        System.out.println params //Trying to see if any values from the problem fields got lost.
        render(view: "create", model: [loadInstance: loadInstance])
    }
}

You will notice in the println statement in the else part of my save closure which prints out the params. When I did this I found that the value selected in the Logged By field in the first view was indeed passed from the first view all the way to this point correctly, but I don't know why it is not displayed when the Load create view is rendered in the very next line of code, or at the least why something (i.e. loggedByUsers from the truckingmanagement/load/create controller) does not populate the Logged By field when the view is rendered. Any help would be appreciated, and sorry for the verbosity.

解决方案

To answer your question posed in the comment response. You might want to investigate using chain in your controller. You will need to re-work your create action a little to only instance a new loadInstance if not already present in the model. However, that should do the trick.

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