保存在grails中具有多对多关系的对象
我正在尝试保存具有多个关系的对象。 SellingCompany可以拥有多个账户，账户可以与许多销售公司相关联。因此，存储在SellingCompaniesAccount
中的表之间存在许多关系我的Account_Info域名如下：
class AccountInfo {
static mapping ={
table 'AccountInfo'
version false
//id column:'accountInfoID'
}
String evi_pass_phrase
String evi_username
String security_key
// to make sure fields show up in a particular order
static constraints = {
//accountInfoID(insert:false,update:false)
evi_pass_phrase()
evi_username()
security_key()
}
static hasMany = [sellingcompaniesaccount:SellingCompaniesAccount]
String toString() {
return "${evi_username}"
}
}
My SellingComapanies域名如下：
class SellingCompanies
{
static mapping = {
table 'SellingCompanies'
version false
}
String name
//static belongsTo = AccountInfo
//static hasMany = [accounts: AccountInfo]
static hasMany = [sellingcompaniesaccount:SellingCompaniesAccount]
static constraints = {
name(blank:false, validator:
{ val, obj ->
def similarSellingCompanies = SellingCompanies.findByNameIlike(val)
return !similarSellingCompanies || (obj.id == similarSellingCompanies.id)
})
}
//String toString() { name }
}
包含Many-Many关系的表格如下：
class SellingCompaniesAccount {
static constraints = {
// ensure the group of sellingCompaneis and accountInfo values are unique
agency_name(unique:['sellingCompanies','accountInfo'])
}
int agency_id
String agency_name
String consultant_id
String code
Boolean isActive
String iata
ContactInfo contactinfo
static belongsTo = [sellingCompanies:SellingCompanies, accountInfo:AccountInfo]
}
}
create.gsp文件中的表单包含实际迭代所有不同SellingCompanies的代码，并显示为复选框。
<g:form action="save" method="post">
<div class="dialog">
<table width="500px" border="0px" color="red">
<tbody>
<tr class="prop">
<td valign="top" class="name"><label for="accountInfo"><g:message
code="sellingCompaniesAccount.accountInfo.label"
default="Account Info" /></label></td>
<td valign="top"
class="value ${hasErrors(bean: sellingCompaniesAccountInstance, field: 'accountInfo', 'errors')}">
<g:select name="accountInfo.id"
from="${content_hub_admin.AccountInfo.list()}" optionKey="id"
value="${sellingCompaniesAccountInstance?.accountInfo?.id}" /></td>
</tr>
<tr class="prop">
<td valign="top" class="name"><label for="sellingCompanies"><g:message
code="sellingCompaniesAccount.sellingCompanies.label"
default="Selling Companies" /></label></td>
<td valign="top"
class="">
<g:each in="${content_hub_admin.SellingCompanies.list()}" var="item" status="i">
${++i}. ${item.name} <g:checkBox name="sellingcompanies_${++i-1}" optionKey="id" value="${item.id}" /> <br>
</g:each>
<!-- end here by rsheyeah -->
</td>
</tr>
<tr class="prop">
<td valign="top" class="name"><label for="code"><g:message
code="sellingCompaniesAccount.code.label" default="Code" /></label></td>
<td valign="top"
class="value ${hasErrors(bean: sellingCompaniesAccountInstance, field: 'code', 'errors')}">
<g:textField name="code"
value="${sellingCompaniesAccountInstance?.code}" /></td>
</tr>
<tr class="prop">
<td valign="top" class="name"><label for="agency_name"><g:message
code="sellingCompaniesAccount.agency_name.label"
default="Agencyname" /></label></td>
<td valign="top"
class="value ${hasErrors(bean: sellingCompaniesAccountInstance, field: 'agency_name', 'errors')}">
<g:textField name="agency_name"
value="${sellingCompaniesAccountInstance?.agency_name}" /></td>
</tr>
<tr class="prop">
<td valign="top" class="name"><label for="isActive"><g:message
code="sellingCompaniesAccount.isActive.label" default="Is Active" /></label>
</td>
<td valign="top"
class="value ${hasErrors(bean: sellingCompaniesAccountInstance, field: 'isActive', 'errors')}">
<g:checkBox name="isActive"
value="${sellingCompaniesAccountInstance?.isActive}" /></td>
</tr>
<tr class="prop">
<td valign="top" class="name"><label for="agency_id"><g:message
code="sellingCompaniesAccount.agency_id.label" default="Agencyid" /></label>
</td>
<td valign="top"
class="value ${hasErrors(bean: sellingCompaniesAccountInstance, field: 'agency_id', 'errors')}">
<g:textField name="agency_id"
value="${fieldValue(bean: sellingCompaniesAccountInstance, field: 'agency_id')}" />
</td>
</tr>
<tr class="prop">
<td valign="top" class="name"><label for="iata"><g:message
code="sellingCompaniesAccount.iata.label" default="Iata" /></label></td>
<td valign="top"
class="value ${hasErrors(bean: sellingCompaniesAccountInstance, field: 'iata', 'errors')}">
<g:textField name="iata"
value="${sellingCompaniesAccountInstance?.iata}" /></td>
</tr>
<tr class="prop">
<td valign="top" class="name"><label for="consultant_id"><g:message
code="sellingCompaniesAccount.consultant_id.label"
default="Consultantid" /></label></td>
<td valign="top"
class="value ${hasErrors(bean: sellingCompaniesAccountInstance, field: 'consultant_id', 'errors')}">
<g:textField name="consultant_id"
value="${sellingCompaniesAccountInstance?.consultant_id}" /></td>
</tr>
<tr class="prop">
<td valign="top" class="name"><label for="contactinfo"><g:message
code="sellingCompaniesAccount.contactinfo.label"
default="Contactinfo" /></label></td>
<td valign="top"
class="value ${hasErrors(bean: sellingCompaniesAccountInstance, field: 'contactinfo', 'errors')}">
<g:select name="contactinfo.id"
from="${content_hub_admin.ContactInfo.list()}" optionKey="id"
value="${sellingCompaniesAccountInstance?.contactinfo?.id}" /></td>
</tr>
</tbody>
</table>
</div>
<div class="buttons"><span class="button"><g:submitButton
name="create" class="save"
value="${message(code: 'default.button.create.label', default: 'Create')}" /></span>
</div>
</g:form>
最后是处理保存和列表功能的控制器。
class SellingCompaniesAccountController {
private static Logger log = Logger.getLogger(SellingCompaniesAccountController.class)
//def index = { }
//def scaffold = true
def index = { redirect(action:list,params:params) }
//To limit access to controller actions based on the HTTP request method.
def allowedMethods = [save:'POST']
//create.gsp exists
def create = {
render(view:"create")
}
//edit.gsp exists
//def edit = {}
//list.gsp exists
def list = {
[ sellingCompaniesAccountInstanceList: SellingCompaniesAccount.list( max:15) ]
}
//show.gsp exists
//def show={}
//save.gsp exists
def save = {
log.info "Saving: " + params.toString()
println("Saving: " + params.toString())
def sellingCompaniesAccount = params.sellingCompaniesAccount
println(sellingCompaniesAccount)
def sellingCompanies = params.sellingCompanies
log.info "sellingCompanies: " + sellingCompanies
println(sellingCompanies)
def sellingCompaniesAccountInstance = new SellingCompaniesAccount(name: params.name)
println(params.name)
params.each {
if (it.key.contains("_sellingcompanies"))
//sellingCompaniesAccountInstance.sellingCompaniesId << SellingCompanies.get((it.key - "sellingcompanies_") as Integer)
if (it.key.contains("sellingcompanies_"))
sellingCompaniesAccountInstance.sellingCompaniesId << SellingCompanies.get((it.key - "sellingcompanies_") as Integer)
}
log.info sellingCompaniesAccountInstance
if (sellingCompaniesAccountInstance.save(flush: true)) {
flash.message = "${message(code: 'default.created.message', args: [message(code: 'sellingCompaniesAccountInstance.label', default: 'sellingCompaniesAccountInstance'), sellingCompaniesAccountInstance.id])}"
redirect(action: "show", id: sellingCompaniesAccountInstance.id)
log.info sellingCompaniesAccountInstance
}
else {
render(view: "create", model: [sellingCompaniesAccountInstance: sellingCompaniesAccountInstance])
}
}
}
现在，我收到以下错误，因为显示空的隐藏值，如_sellingcompanies_1等：
错误日志：
Saving: ["accountInfo.id":"1", "accountInfo":["id":"1"], "_sellingcompanies_5":"", "_isActive":"", "code":"test", "agency_name":"test", "sellingcompanies_4":"4", "sellingcompanies_5":"5", "create":"Create", "isActive":"on", "iata":"test", "agency_id":"test", "contactinfo.id":"1", "contactinfo":["id":"1"], "consultant_id":"test", "sellingcompanies_2":"2", "_sellingcompanies_1":"", "sellingcompanies_3":"3", "_sellingcompanies_2":"", "_sellingcompanies_3":"", "sellingcompanies_1":"1", "_sellingcompanies_4":"", "action":"save", "controller":"sellingCompaniesAccount"]
null
null
null
2011-03-15 17:13:44,620 [http-8080-2] ERROR org.codehaus.groovy.grails.web.errors.GrailsExceptionResolver - For input string: "_5"
java.lang.NumberFormatException: For input string: "_5"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
at java.lang.Integer.parseInt(Integer.java:449)
at java.lang.Integer.valueOf(Integer.java:554)
at content_hub_admin.SellingCompaniesAccountController$_closure4_closure5.doCall(content_hub_admin.SellingCompaniesAccountController:70)
at content_hub_admin.SellingCompaniesAccountController$_closure4.doCall(content_hub_admin.SellingCompaniesAccountController:66)
at content_hub_admin.SellingCompaniesAccountController$_closure4.doCall(content_hub_admin.SellingCompaniesAccountController)
at java.lang.Thread.run(Thread.java:680)
首先，隐藏值来自哪里，这种方法可以很好地提交SellingCompaniesAccount控制器类中的Many-Many关系信息。这样做的任何更好的技巧。
create.gsp在浏览器中解析为：
提前致谢
2 个答案:
答案 0 :(得分：2)
如果其他人遇到同样的问题，那么Daniel的上述答案绝对正确，只是在Grails 2.7.8中添加了一些更改
所有复选框都具有相同的值=＆＃34; $ {item.id}＆＃34;和名称=＆＃34;销售公司＆＃34;如下所示 -
<!-- ... snip ... -->
<tr class="prop">
<td valign="top" class="name"><label for="sellingCompanies"><g:message
code="sellingCompaniesAccount.sellingCompanies.label"
default="Selling Companies" /></label></td>
<td valign="top"
class="">
<g:each in="${content_hub_admin.SellingCompanies.list()}" var="item" status="i">
${++i}. ${item.name} <g:checkBox name="sellingcompanies" optionKey="id" value="${item.id}" /> <br>
</g:each>
<!-- end here by rsheyeah -->
</td>
</tr>
<!-- ... snip ... -->
最好的部分是，在目前版本的grails中你不需要使用＆＃34; flatten（）作为字符串＆＃34;如Daniel所述，这些值将自动由grails处理，并将保留在连接表中。您需要确保的是，您的复选框具有正确的名称和值。
希望它有所帮助!!
答案 1 :(得分：1)
问题在于这段代码：
params.each {
if (it.key.contains("_sellingcompanies"))
//sellingCompaniesAccountInstance.sellingCompaniesId << SellingCompanies.get((it.key - "sellingcompanies_") as Integer)
if (it.key.contains("sellingcompanies_"))
sellingCompaniesAccountInstance.sellingCompaniesId << SellingCompanies.get((it.key - "sellingcompanies_") as Integer)
}
来自表格帖子的你的参数是：
Saving: ["accountInfo.id":"1", "accountInfo":["id":"1"], "_sellingcompanies_5":"", "_isActive":"", "code":"test", "agency_name":"test", "sellingcompanies_4":"4", "sellingcompanies_5":"5", "create":"Create", "isActive":"on", "iata":"test", "agency_id":"test", "contactinfo.id":"1", "contactinfo":["id":"1"], "consultant_id":"test", "sellingcompanies_2":"2", "_sellingcompanies_1":"", "sellingcompanies_3":"3", "_sellingcompanies_2":"", "_sellingcompanies_3":"", "sellingcompanies_1":"1", "_sellingcompanies_4":"", "action":"save", "controller":"sellingCompaniesAccount"]
循环中的测试首先检查参数键是否包含“ _
您可以通过执行以下操作来解决此问题：
params.each {
if (it.key.startsWith("sellingcompanies")) {
sellingCompaniesAccountInstance.sellingCompaniesId << SellingCompanies.get((it.key - "sellingcompanies_") as Integer)
}
}
可能更好的方法是处理这个问题，但是要改变你的gsp，为每个销售公司提供相同的命名参数，然后循环实际应用的值。像这样：
<!-- ... snip ... -->
<tr class="prop">
<td valign="top" class="name"><label for="sellingCompanies"><g:message
code="sellingCompaniesAccount.sellingCompanies.label"
default="Selling Companies" /></label></td>
<td valign="top"
class="">
<g:each in="${content_hub_admin.SellingCompanies.list()}" var="item" status="i">
${++i}. ${item.name} <g:checkBox name="sellingcompanies" optionKey="id" value="${item.id}" /> <br>
</g:each>
<!-- end here by rsheyeah -->
</td>
</tr>
<!-- ... snip ... -->
然后在您的控制器中执行以下操作：
params.sellingcompanies = [params.sellingcompanies].flatten() as String[]
sellingCompaniesAccountInstance.sellingCompaniesId = params.sellingcompanies.collect { SellingCompanies.get(it) }
这应确保您正确评估从模型对象传递的适当值，而不是黑客入侵检索方法。
希望这有帮助！
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