我目前正在从事一个 grails 项目，并试图创建一个一对多的表单。我一直在使用下面链接中的教程开始：
http://omarello.com/2010/08/grails-one-to-many-dynamic-forms/
该解决方案有一个表单，其中包含两个静态数据字段和一个动态字段，允许用户根据需要添加任意数量的变量，然后保存它们。您可以在下面看到此功能的所有各种文件：
Products.Groovy 域类
import org.apache.commons.collections.list.LazyList;
import org.apache.commons.collections.FactoryUtils;
/**
* Products
* A domain class describes the data object and it's mapping to the database
*/
class Products {
String productType
String product
List vars = new ArrayList()
//This represents a product belonging to a single department
static belongsTo = [dept:Depts]
static hasMany = [ vars:Dynam ]
static mapping = {
vars cascade:"all-delete-orphan"
}
def getVarsList() {
return LazyList.decorate(
vars,
FactoryUtils.instantiateFactory(Dynam.class))
}
static constraints = {
productType blank: false
product blank:false, size: 1..160
}
}
动态的groovy
class Dynam {
public enum VarType{
T("Testimonial"),
D("Dimentions"),
N("Networking")
final String value;
VarType(String value) {
this.value = value;
}
String toString(){
value;
}
String getKey(){
name()
}
static list() {
[T, D, N]
}
}
static constraints = {
index(blank:false, min:0)
data(blank:false)
type(blank:false, inList:VarType.list(), minSize:1, maxSize:1)
}
int index
String data
VarType type
boolean deleted
static transients = [ 'deleted' ]
static belongsTo = [ product:Products ]
def String toString() {
return "($index) ${data} - ${type.value}"
}
}
ProductsController.Groovy
创造功能
def createDynProduct(){
def productsInstance = new Products()
productsInstance.properties = params
//This is used in order to create a new User Object for the current User logged in
def userObjects = springSecurityService.currentUser
//This passes the 2 models to the view one being Products and the other a User Department
[productsInstance: productsInstance, dept: userObjects.dept]
}
保存功能
def save() {
def productInfo = "dynam"
def userObjects = springSecurityService.currentUser
def dept = Depts.findByName(params.dept.name)
def product = new Products(product:productInfo, productType:params.productType, dept: dept, vars:params.varsList)
def _toBeRemoved = product.vars.findAll {!it}
// if there are vars to be removed
if (_toBeRemoved) {
product.vars.removeAll(_toBeRemoved)
}
//update my indexes
product.vars.eachWithIndex(){phn, i ->
if(phn)
phn.index = i
}
//If the the save is not successful do this
if (!product.save(flush: true)) {
render(view: "create", model: [productsInstance: product, dept: userObjects.dept])
return
}
redirect(action: "show", id: product.id)
}
createDynProduct.gsp
<%@ page import="com.tool.Products" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta name='layout' content='springSecurityUI'/>
<g:set var="entityName" value="${message(code: 'messages.label', default: 'Products')}" />
<title><g:message code="default.create.label" args="[entityName]" /></title>
</head>
<body>
<g:renderErrors bean="${productsInstance}" />
<g:form action='save' name='ProductForm' >
<br/>
<!-- Render the product template (_dynam.gsp) here -->
<g:render template="dynam" model="['productsInstance':productsInstance]"/>
<!-- Render the product template (_dynam.gsp) here -->
<div class="buttons">
<g:submitButton name="create" class="save" value="${message(code: 'default.button.create.label', default: 'Create')}" />
</div>
</g:form>
<!-- Render the var template (_var.gsp) hidden so we can clone it -->
<g:render template='var' model="['var':null,'i':'_clone','hidden':true]"/>
<!-- Render the var template (_var.gsp) hidden so we can clone it -->
</body>
</html>
_dynam.gsp
<div class="dialog">
<table>
<tbody>
<tr class="prop">
<td valign="top" class="name">
<label for="productType">Product Type</label>
</td>
<td>
<g:textField name='productType' bean="${productsInstance}" value="${productsInstance.productType}"
size='40'/>
</td>
</tr>
<tr class="prop">
<td valign="top" class="name">
<label for="Vars">Vars</label>
</td>
<!-- Render the vars template (_vars.gsp) here -->
<g:render template="vars" model="['productsInstance':productsInstance]" />
<!-- Render the vars template (_vars.gsp) here -->
</tr>
<tr class="prop">
<td valign="top" class="name">
<label for="Department">Department</label>
</td>
<td>
<g:textField name='dept.name' readonly="yes" value="${dept.name}" size='40'/>
</td>
</tr>
</tbody>
</table>
</div>
_vars.gsp
<script type="text/javascript">
var childCount = ${productsInstance?.vars.size()} + 0;
function addVar(){
var clone = $("#var_clone").clone()
var htmlId = 'varsList['+childCount+'].';
var varInput = clone.find("input[id$=number]");
clone.find("input[id$=id]")
.attr('id',htmlId + 'id')
.attr('name',htmlId + 'id');
clone.find("input[id$=deleted]")
.attr('id',htmlId + 'deleted')
.attr('name',htmlId + 'deleted');
clone.find("input[id$=new]")
.attr('id',htmlId + 'new')
.attr('name',htmlId + 'new')
.attr('value', 'true');
varInput.attr('id',htmlId + 'data')
.attr('name',htmlId + 'data');
clone.find("select[id$=type]")
.attr('id',htmlId + 'type')
.attr('name',htmlId + 'type');
clone.attr('id', 'var'+childCount);
$("#childList").append(clone);
clone.show();
varInput.focus();
childCount++;
}
//bind click event on delete buttons using jquery live
$('.del-var').live('click', function() {
//find the parent div
var prnt = $(this).parents(".var-div");
//find the deleted hidden input
var delInput = prnt.find("input[id$=deleted]");
//check if this is still not persisted
var newValue = prnt.find("input[id$=new]").attr('value');
//if it is new then i can safely remove from dom
if(newValue == 'true'){
prnt.remove();
}else{
//set the deletedFlag to true
delInput.attr('value','true');
//hide the div
prnt.hide();
}
});
</script>
<div id="childList">
<g:each var="var" in="${productsInstance.vars}" status="i">
<!-- Render the var template (_var.gsp) here -->
<g:render template='var' model="['var':var,'i':i,'hidden':false]"/>
<!-- Render the var template (_var.gsp) here -->
</g:each>
</div>
<input type="button" value="Add Var" onclick="addVar();" />
_var.gsp
<div id="var${i}" class="var-div" <g:if test="${hidden}">style="display:none;"</g:if>>
<g:hiddenField name='varsList[${i}].id' value='${var?.id}'/>
<g:hiddenField name='varsList[${i}].deleted' value='false'/>
<g:hiddenField name='varsList[${i}].new' value="${var?.id == null?'true':'false'}"/>
<g:textField name='varsList[${i}].number' value='${var?.data}' />
<g:select name="varsList[${i}].type"
from="${com.tool.Dynam.VarType.values()}"
optionKey="key"
optionValue="value"
value = "${var?.type?.key}"/>
<span class="del-var">
<img src="${resource(dir:'images/skin', file:'icon_delete.png')}"
style="vertical-align:middle;"/>
</span>
</div>
该解决方案部分有效，因此您可以转到产品页面并加载字段，动态字段被添加到视图中，我可以输入数据。但是，当我单击保存时，静态字段的数据会保留，但动态变量不会保存到域中。
我没有收到任何错误，但我相信它与下面的保存功能行有关，尤其是vars:params.varsList。
def product = new Products(product:productInfo, productType:params.productType, dept: dept, vars:params.varsList)
我已经使用 println 检查了 varsList 数据，它返回 null，有人可以帮忙吗？
提前致谢