grails - 在 grails 中保存具有多对多关系的对象

Question

我正在尝试保存具有多对多关系的对象。一个 SellingCompany 可以有多个账户，并且一个账户可以与多个 SellingCompanies 相关联。所以存储在 SellingCompaniesAccount 中的表之间存在多对多关系

我的 Account_Info 域如下:

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}"
    }
}

我的 SellingCompanies 域如下:

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 }
}

保存Many-Many关系的表如下:

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遍历所有不同 SellingCompanies 并显示为复选框的代码。

<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}.  ${item.name}&nbsp;&nbsp;<g:checkBox name="sellingcompanies_${++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 Controller 。

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，原因是空的隐藏值显示为 _salescompanies_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，隐藏值从何而来，这种方法是否适合提交 SellingCompaniesAccount Controller 类中的多对多关系信息。这样做的任何更好的技术。

create.gsp 在浏览器中解析为:


提前致谢

Answer 1

如果其他人有同样的问题，那么上面 Daniel 的回答是绝对正确的，只是在 Grails 2.7.8 中添加了一些更改。
所有复选框都将具有相同的 value = "${item.id}"和 name ="sellingcompanies"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}.  ${item.name}&nbsp;&nbsp;<g:checkBox name="sellingcompanies" optionKey="id" value="${item.id}" /> <br>
            </g:each>
        <!--  end here by rsheyeah -->
        </td>
    </tr>
    <!-- ... snip ... -->

最好的部分是在当前版本的 Grails 中你不需要使用 flatten() as string正如 Daniel 所提到的，这些值将由 Grails 自动处理，并将保留在连接表中。您只需要确保您的复选框具有正确的名称和值。
希望能帮助到你!