Grails view (show.gsp) does not handle an instance of the expected class, instead gets zero

Question

Grails view (show.gsp) does not handle an instance of the expected class, instead gets zero

I have a User class in my WebApplication and a class driver, which is a subclass of User. Here is the code:

elektrova package

class User {

String username
String password
String firstName
String lastName
UserRole role

static belongsTo = [
    hauler:Hauler
]

static hasMany = [
    createdJobs:Job,
    activities:UserActivityHistory
]

static mappedBy = [
    createdJobs:'creationUser'
]

static mapping = { tablePerHierarchy false }

static constraints = {
    username(blank:false, size:4..15,matches:/[\S]+/, unique:true)
    password(blank:false, size:4..15,matches:/[\S]+/)
    firstName(blank:false, nullable:false)
    lastName(blank:false, nullable:false)
    role(blank:false, nullable:false)
}

@Override
def encodeAsHTML(){
    firstName + "  " + lastName
}
}



class Driver extends User{


UserRole role = UserRole.DRIVER

static hasMany = [
    assignedJobs:Job
    ]
static mappedBy = [assignedJobs:'assignedUser']
static constraints = {
}
}

Here is the creation of tesdata in bootstrap:

        User dispo = new Driver(hauler: hauler, firstName: "Dis", lastName: "Po", password: "dispo", role: UserRole.ADMIN, username: "dispo" ).save(failOnError: true)
        Driver driver = new Driver(hauler: hauler, firstName: "Kai", lastName: "Uwe", password: "kauw", role: UserRole.DRIVER, username: "kauw" ).save(failOnError: true)
        Driver driver2 = new Driver(hauler: hauler, firstName: "Hans", lastName: "Juergen", password: "haju", role: UserRole.DRIVER, username: "haju" ).save(failOnError: true)
        User admin = new User(hauler: hauler, firstName: "Ad", lastName: "Min", password: "admin", role: UserRole.ADMIN, username: "admin" ).save(failOnError: true)
        User admin2 = new User(hauler: hauler, firstName: "Ad", lastName: "Min", password: "admin", role: UserRole.ADMIN, username: "admin2" ).save(failOnError: true)

And show.gsp:

<%@ page import="elektrova.User"%>
<!DOCTYPE html>
<html>
<head>
<meta name="layout" content="main">
<g:set var="entityName"
value="${message(code: 'user.label', default: 'User')}" />
<title><g:message code="default.show.label" args="[entityName]" /></title>
</head>
<body>
<g:render template="/navi/navbar" />
<a href="#show-user" class="skip" tabindex="-1"><g:message
        code="default.link.skip.label" default="Skip to content&hellip;" /></a>
<div class="nav" role="navigation">
    <ul>

        <li><g:link class="list" action="index">
                <g:message code="view.user.button.label.list" args="[entityName]" />
            </g:link></li>
        <li><g:link class="create" action="create">
                <g:message code="view.user.button.label.create" args="[entityName]" />
            </g:link></li>
    </ul>
</div>
<div id="show-user" class="scaffold-show" role="main">
    <h1>
        <g:message code="default.show.label" args="[entityName]" />${userInstance.toString() }
    </h1>
    <g:if test="${flash.message}">
        <div class="message" role="status">
            ${flash.message}
        </div>
    </g:if>
    <ol class="property-list user">
<% System.out.println "user : " + userInstance %>
        <g:if test="${userInstance?.hauler}">
            <li class="fieldcontain"><span id="hauler-label"
                class="property-label"><g:message code="hauler.label"
                        default="Hauler" /></span> <span class="property-value"
                aria-labelledby="hauler-label"><g:link controller="hauler"
                        action="show" id="${userInstance?.hauler?.id}">
                        ${userInstance?.hauler?.encodeAsHTML()}
                    </g:link></span></li>
        </g:if>

        <g:if test="${userInstance?.username}">
            <li class="fieldcontain"><span id="username-label"
                class="property-label"><g:message code="user.username.label"
                        default="Username" /></span> <span class="property-value"
                aria-labelledby="username-label"><g:fieldValue
                        bean="${userInstance}" field="username" /></span></li>
        </g:if>

        <g:if test="${userInstance?.password}">
            <li class="fieldcontain"><span id="password-label"
                class="property-label"><g:message code="user.password.label"
                        default="Password" /></span> <span class="property-value"
                aria-labelledby="password-label"><g:fieldValue
                        bean="${userInstance}" field="password" /></span></li>
        </g:if>

        <g:if test="${userInstance?.firstName}">
            <li class="fieldcontain"><span id="firstName-label"
                class="property-label"><g:message
                        code="user.firstName.label" default="First Name" /></span> <span
                class="property-value" aria-labelledby="firstName-label"><g:fieldValue
                        bean="${userInstance}" field="firstName" /></span></li>
        </g:if>

        <g:if test="${userInstance?.lastName}">
            <li class="fieldcontain"><span id="lastName-label"
                class="property-label"><g:message code="user.lastName.label"
                        default="Last Name" /></span> <span class="property-value"
                aria-labelledby="lastName-label"><g:fieldValue
                        bean="${userInstance}" field="lastName" /></span></li>
        </g:if>

        <g:if test="${userInstance?.role}">
            <li class="fieldcontain"><span id="role-label"
                class="property-label"><g:message code="user.role.label"
                        default="Role" /></span> <span class="property-value"
                aria-labelledby="role-label"><g:fieldValue
                        bean="${userInstance}" field="role" /></span></li>
        </g:if>


        <g:if test="${userInstance?.createdJobs}">
            <li class="fieldcontain"><span id="createdJobs-label"
                class="property-label"><g:message
                        code="user.createdJobs.label" default="Created Jobs" /></span> <g:each
                    in="${userInstance.createdJobs}" var="c">
                    <span class="property-value" aria-labelledby="createdJobs-label"><g:link
                            controller="job" action="show" id="${c.id}">
                            ${c?.encodeAsHTML()}
                        </g:link></span>
                </g:each></li>
        </g:if>

        <g:if test="${userInstance?.createdJobs}">
            <li class="fieldcontain"><span id="createdJobs-label"
                class="property-label"><g:message
                        code="user.createdJobs.label" default="Created Jobs" /></span> <g:each
                    in="${userInstance.createdJobs}" var="c">
                    <span class="property-value" aria-labelledby="createdJobs-label"><g:link
                            controller="job" action="show" id="${c.id}">
                            ${c?.encodeAsHTML()}
                        </g:link></span>
                </g:each></li>
        </g:if>

    </ol>
    <g:form url="[resource:userInstance, action:'delete']" method="DELETE">
        <fieldset class="buttons">
            <g:link class="edit" action="edit" resource="${userInstance}">
                <g:message code="default.button.edit.label" default="Edit" />
            </g:link>
            <g:actionSubmit class="delete" action="delete"
                value="${message(code: 'default.button.delete.label', default: 'Delete')}"
                onclick="return confirm('${message(code: 'default.button.delete.confirm.message', default: 'Are you sure?')}');" />
        </fieldset>
    </g:form>
</div>

And the controller:

import static org.springframework.http.HttpStatus.*
import grails.transaction.Transactional

@Transactional(readOnly = true)
class UserController {

def beforeInterceptor = [action: this.&auth]

def auth = {
    if(!session.user) {
        redirect(controller:"login", action: "index")
    }
}

static allowedMethods = [save: "POST", update: "PUT", delete: "DELETE"]
boolean isAdmin



def index(Integer max) {
    params.max = Math.min(max ?: 10, 100)
    model:[userInstanceList: User.list(params),userInstanceCount: User.count()]
}

def show(User userInstance) {
    println 'User: ' + userInstance
    respond userInstance
}

def create() {
    respond new User(params)
}

@Transactional
def save(User userInstance) {
    if (userInstance == null) {
        notFound()
        return
    }

    if (userInstance.hasErrors()) {
        respond userInstance.errors, view:'create'
        return
    }

    userInstance.save flush:true

    request.withFormat {
        form {
            flash.message = message(code: 'default.created.message', args: [message(code: 'userInstance.label', default: 'User'), userInstance.id])
            redirect userInstance
        }
        '*' { respond userInstance, [status: CREATED] }
    }
}

def edit(User userInstance) {
    respond userInstance
}

@Transactional
def update(User userInstance) {
    if (userInstance == null) {
        notFound()
        return
    }

    if (userInstance.hasErrors()) {
        respond userInstance.errors, view:'edit'
        return
    }

    userInstance.save flush:true

    request.withFormat {
        form {
            flash.message = message(code: 'default.updated.message', args: [message(code: 'User.label', default: 'User'), userInstance.id])
            redirect userInstance
        }
        '*'{ respond userInstance, [status: OK] }
    }
}

@Transactional
def delete(User userInstance) {

    if (userInstance == null) {
        notFound()
        return
    }

    userInstance.delete flush:true

    request.withFormat {
        form {
            flash.message = message(code: 'default.deleted.message', args: [message(code: 'User.label', default: 'User'), userInstance.id])
            redirect action:"index", method:"GET"
        }
        '*'{ render status: NO_CONTENT }
    }
}

protected void notFound() {
    request.withFormat {
        form {
            flash.message = message(code: 'default.not.found.message', args: [message(code: 'userInstance.label', default: 'User'), params.id])
            redirect action: "index", method: "GET"
        }
        '*'{ render status: NOT_FOUND }
    }
}
}

Now everything works fine in the UserController, the right instance of the user is always passed to the view. But gsp gets null for all objects, except for two admins, they are displayed correctly. At first I thought it was because subclasses of the view handler can not, but Dispo User is also not displayed. Changing the role of other instances does not display them anyway. Any suggestions what to do?

+3

inheritance grails gsp

olkoza Feb 07 '14 at 13:51

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1 answer

sebnukem · Answer 1 · 2015-01-07T23:11:44+0000

, "" , respond:

def show(User userInstance) {
    println 'User: ' + userInstance
    respond userInstance, model:[userInstance:userInstance]
}

"" , . respond .

Grails view (show.gsp) does not handle an instance of the expected class, instead gets zero

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