我正在使用Grails 2.4.3,并且试图创建一个动态的抽象域类 Controller ,其中包含一些标准方法,每个域类都可以使用该方法。
所以我创建了DomainClassController
abstract class DomainClassController {
def domainClassSearchService
def domainClass = Foo
ApplicationContext context = ServletContextHolder.servletContext.getAttribute(GrailsApplicationAttributes.APPLICATION_CONTEXT) as ApplicationContext
ConfigObject config = context.getBean(GrailsApplication).config
def index() {
if (!domainClass)
return render(text: 'fehler', status: INTERNAL_SERVER_ERROR)
def list = domainClassSearchService.list(params, domainClass, params.max, params.offset, params.sort, params.order)
Integer count = domainClassSearchService.count(params, domainClass)
render view: 'index', model: [list: list, count: count]
}
def search() {
if (!domainClass)
return render(text: 'fehler', status: INTERNAL_SERVER_ERROR)
def list = domainClassSearchService.list(params, domainClass, params.max, params.offset, params.sort, params.order)
Integer count = domainClassSearchService.count(params, domainClass)
render template: 'list', model: [list: list, count: count, params: params]
}
}
现在我想要一个扩展
BarController
的DomainClasscontroller
:class BarController extends DomainClassController {
def domainClass = Bar
}
如何在每个Controller中设置domainClass,抽象 Controller 可以将domainClass用于索引和搜索方法?
编辑
我做到了,就像答案中描述的那样使它起作用。
但是现在我想使create Method动态化,所以我添加了以下内容:
def create(){
def domainClassObject = getDomainClass()?.newInstance()
domainClassObject.properties = params
return render(view: getViewPath() + 'create', model: [domainClass: domainClassObject])
}
这项工作本身也可以,但是我不想在GSP中使用
domainClass
属性。我想在Lower Cas中使用Class名称,这样 View 中的类foo
的Foo
和类bar
的Bar
。如何在lowerCase中将模型名称设置为ClassName?
最佳答案
您可以像RestfulController
一样执行此操作。参见https://github.com/grails/grails-core/blob/v2.5.4/grails-plugin-rest/src/main/groovy/grails/rest/RestfulController.groovy。
在https://github.com/grails/grails-core/blob/d45c00be6d8fdcce3edd21e16b50e30df9151b58/grails-plugin-rest/src/main/groovy/grails/rest/RestfulController.groovy#L37定义了一个名为Class
的resource
属性。在该newInstance()
上调用Class
方法以创建一个新实例。参见https://github.com/grails/grails-core/blob/d45c00be6d8fdcce3edd21e16b50e30df9151b58/grails-plugin-rest/src/main/groovy/grails/rest/RestfulController.groovy#L267。
class RestfulController<T> {
Class<T> resource
String resourceName
String resourceClassName
boolean readOnly
// ...
RestfulController(Class<T> resource) {
this(resource, false)
}
RestfulController(Class<T> resource, boolean readOnly) {
this.resource = resource
this.readOnly = readOnly
resourceClassName = resource.simpleName
resourceName = GrailsNameUtils.getPropertyName(resource)
}
// ...
/**
* Lists all resources up to the given maximum
*
* @param max The maximum
* @return A list of resources
*/
def index(Integer max) {
params.max = Math.min(max ?: 10, 100)
respond listAllResources(params), model: [("${resourceName}Count".toString()): countResources()]
}
/**
* Creates a new instance of the resource. If the request
* contains a body the body will be parsed and used to
* initialize the new instance, otherwise request parameters
* will be used to initialized the new instance.
*
* @return The resource instance
*/
protected T createResource() {
T instance = resource.newInstance()
bindData instance, getObjectToBind()
instance
}
/**
* List all of resource based on parameters
*
* @return List of resources or empty if it doesn't exist
*/
protected List<T> listAllResources(Map params) {
resource.list(params)
}
/**
* Counts all of resources
*
* @return List of resources or empty if it doesn't exist
*/
protected Integer countResources() {
resource.count()
}
}
关于grails - 动态抽象Grails Controller ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36568897/