Grails Field插件：选择一对多关系的标签

Question

I'm using Grails 2.2.3 and Fields plugin 1.3. I want to customize fields to manage one-to-many relationships using select tag.

In views/_fields/oneToMany/_input.gsp I have:

<g:select name="${property}.id" from="${type.list()}" optionKey="id" value="${value}" class="form-control one-to-many" noSelection="['null': "${label}"]" />

But type is a set, so I can't use list function.

How can I retrieve target domain class?

Answer 1

As long as you use a Map to declare the relationship, for example:

static hasMany = [ books: Book ]

You can get the list of the referenced domain, which is the key from the hasMany property of the bean , so the from attribute should change to

from="${bean.hasMany[property].list()}"

Alternatively you can pass the list to the _input.gsp template prefixing the variable name with input- , eg

<f:field property="books" input-domainList="${bookInstaceList}" />

In the _input.gsp template you can use the variable as follows:

from="${domainList}"

or mixing both methods:

from"${domainList ?: bean.hasMany[property].list()}"

Answer 2

I found this solution for the problem, this code work fine with one to many and one to one

<div class="input-group">
  <g:select name="${persistentProperty.toString().contains('one-to-many')?property:property+'.id'}" value="${value?.id}" required="${required}"
    noSelection="${['null':'Escriba...']}" class="select2 col-md-6"
    multiple="${persistentProperty.toString().contains('one-to-many')?true:false}" from="${grailsApplication.getDomainClass(persistentProperty.properties['associatedEntity'].toString()).clazz.list()}"
    optionKey="id"></g:select>
</div>

This solution can be helpful. I found in the documentacion of Fields Plugin, the persistentProperty is a class type DomainProperty but their methods doesn't works and I found the correct class is org.grails.datastore.mapping.model.MappingFactory

Answer 3

you can use .toArray() method on your Set instead of .list().

ale

Answer 4

You can use the code below to identify the Element of your collection

def className = bean.hasMany[property].properties.typeName

See my "views/_fields/oneToMany/_input.gsp" implementation:

<%@ page defaultCodec="html" %>
<%
    def className = bean.hasMany[property].properties.typeName
    def simpleName = Class.forName(className).simpleName
    def beanSimpleName = bean.class.simpleName
    def createUri = "/${simpleName.toLowerCase()}/create?${beanSimpleName.toLowerCase()}.id=${bean.id}"
%>

<a id="add${simpleName}" name="add${simpleName}" href="${createLink(uri: "${createUri}")}">
        Add ${simpleName}
</a>
<ul>
    <g:each var="item" in="${value}">
        <li>
            <a href="${createLink(uri: "/${simpleName.toLowerCase()}/show/${item.id}")}">${item}</a>
        </li>
    </g:each>
</ul>