Grails 查询GORM关联
为了学习grails,我想构建一个非常简单的帮助台应用程序。我希望用户能够登录,创建请求/事件。 用户选择productline、该productline的主题和该主题的子主题。每个子主题都有一个或多个支持用户负责。 另一方面,支持用户可以查看属于其“管辖范围”的事件列表。我的域类如下所示:Grails 查询GORM关联,grails,gorm,Grails,Gorm,为了学习grails,我想构建一个非常简单的帮助台应用程序。我希望用户能够登录,创建请求/事件。 用户选择productline、该productline的主题和该主题的子主题。每个子主题都有一个或多个支持用户负责。 另一方面,支持用户可以查看属于其“管辖范围”的事件列表。我的域类如下所示: class Request{ Date dateCreated String subject String startedBy String description String status S
class Request{
Date dateCreated
String subject
String startedBy
String description
String status
String priority
Productline productline
Topic topic
Subtopic subtopic
static constraints = {
//id unique: true
dateCreated(blank:true,nullable:true)
subject()
description(maxSize:5000)
status (blank:true,nullable:true)
priority(inList:["Normalan","Hitno","Nije hitno"])
productline(blank:true,nullable:true)
topic(blank:true,nullable:true)
subtopic(blank:true,nullable:true)
company(blank:true,nullable:true)
contact(blank:true,nullable:true)
startedBy(blank:true,nullable:true)
acceptedBy(blank:true,nullable:true)
}
Responsability.findAllBySupport(springSecurityService.currentUser).
collect {Incident.findAllBySubtopic(it.subtopic)}.flatten()
}
类副标题{
String subtopic
Productline productline
Topic topic
static hasMany = [responsibilities: Responsibility]
String toString(){
"$subtopic"
}
static constraints = {
subtopic()
productline()
topic()
}
List contacts(){
return responsibilities.collect{it.contact}
}
List addToContacts(Contact contact){
Responsibility.link(contacts, this)
return contacts()
}
List removeFromContacts(Contact contact){
Responsibility.unlink(contact, this)
return contacts()
}
}
}
}
在我的RequestController中有supportList()操作。成功登录后,具有role_支持的用户将被发送到此操作,该操作应过滤数据,以便发送到视图的唯一请求实例是当前登录用户负责的实例。这就是行动:
def supportList = {
def contact = Contact.findByUser(springSecurityService.currentUser)
def requestList = contact.subtopics().collect {Request.findAllBySubtopic(it)}
params.max = Math.min(params.max ? params.int('max') : 10, 100)
[requestInstanceList: requestList, requestInstanceTotal: requestList.count()]
}
我的桌子空了。实际上,我得到了预期的行数,但所有字段都是空的。我做错了什么
这是我的普惠制:
<%@ page import="com.testapp.Request" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta name="layout" content="main" />
<g:set var="entityName" value="${message(code: 'request.label', default: 'Request')}" />
<title><g:message code="default.list.label" args="[entityName]" /></title>
</head>
<body>
<div class="nav">
<span class="menuButton"><g:link class="create" action="create">
<g:message code="default.new.label" args="[entityName]" /></g:link></span>
</div>
<div class="body">
<h1>Lista Zahteva</h1>
<g:if test="${flash.message}">
<div class="message">${flash.message}</div>
</g:if>
<div class="list">
<table>
<thead>
<tr>
<g:sortableColumn property="id"
title="${message(code: 'request.id.label', default: 'Id')}" />
<g:sortableColumn property="subject" title="Datum kreiranja" />
<g:sortableColumn property="subject" title="Tema" />
<g:sortableColumn property="priority" title="Prioritet" />
<th><g:message code="incident.startedBy" default="Započeo" /></th>
<g:sortableColumn property="status" title="Status" />
</tr>
</thead>
<tbody>
<g:each in="${requestInstanceList}" status="i" var="requestInstance">
<tr class="${(i % 2) == 0 ? 'odd' : 'even'}">
<td><g:link action="show" id="${requestInstance.id}">
${fieldValue(bean: requestInstance, field: "id")}</g:link></td>
<td width="200">${fieldValue(bean:requestInstance,field:"dateCreated")}</td>
<td width="200">${fieldValue(bean: requestInstance, field: "subject")}</td>
<td width="200">${fieldValue(bean: requestInstance, field: "priority")}</td>
<td width="200">${fieldValue(bean: requestInstance, field: "startedBy")}</td>
<td width="200">${fieldValue(bean: requestInstance, field: "status")}</td>
</tr>
</g:each>
</tbody>
</table>
</div>
<div class="paginateButtons">
<g:paginate total="${requestInstanceTotal}" />
</div>
</div>
</body>
</html>
利斯塔扎赫特娃
${flash.message}
${fieldValue(bean:requestInstance,字段:“id”)}
${fieldValue(bean:requestInstance,字段:“dateCreated”)}
${fieldValue(bean:requestInstance,字段:“subject”)}
${fieldValue(bean:requestInstance,field:“priority”)}
${fieldValue(bean:requestInstance,field:“startedBy”)}
${fieldValue(bean:requestInstance,字段:“status”)}
使用当前型号,您可以如下方式查询当前用户职责:
class Request{
Date dateCreated
String subject
String startedBy
String description
String status
String priority
Productline productline
Topic topic
Subtopic subtopic
static constraints = {
//id unique: true
dateCreated(blank:true,nullable:true)
subject()
description(maxSize:5000)
status (blank:true,nullable:true)
priority(inList:["Normalan","Hitno","Nije hitno"])
productline(blank:true,nullable:true)
topic(blank:true,nullable:true)
subtopic(blank:true,nullable:true)
company(blank:true,nullable:true)
contact(blank:true,nullable:true)
startedBy(blank:true,nullable:true)
acceptedBy(blank:true,nullable:true)
}
Responsability.findAllBySupport(springSecurityService.currentUser).
collect {Incident.findAllBySubtopic(it.subtopic)}.flatten()
实际上,responsibility只是用户和子主题之间的一个联接表。如果您删除了它,并在用户和子主题之间定义了多对多关系:
class User {
static hasMany = [supportedSubtopics: Subtopic]
...
}
class SubTopic {
static hasMany = [supportingUsers: User]
....
}
您可以这样查询:
springSecurityService.currentUser.supportedSubtopics.collect {Incidents.findBySubtopic(it)}.flatten()
通过将hasMany=[incidents:Incident]
添加到子主题,您可以将其进一步简化为
springSecurityService.currentUser.supportedSubtopics*.incidents.flatten()
如果我定义了用户和子主题之间的多对多关系,那么将用户添加到子主题会是这样的:subtopic.AddToUsers(someUser)?另外,是否需要定义子主题和用户之间的父子关系?1)是的,添加会是这样的。2) 它不是真正的父子关系,因为两个类中都没有指定belongsTo。若您在子主题中省略了hasMany,Grails将把关系视为一对多。我不确定它需要什么,因为它仍然会使用连接表来映射关系。您能检查一下吗?请粘贴您的GSP。当你说“我得到了预期的行数”时,你是指
requestInstanceList
,还是requestInstanceTotal
?
springSecurityService.currentUser.supportedSubtopics*.incidents.flatten()