I need to create a new instance of the current instance type, I tried:
var instance:Dynamic = Type.createInstance(Type.resolveClass(Type.getClassName(this)));
I get this error:
src/com/clientside/compoents/core/Component.hx:995: characters 84-88 :
com.clientside.compoents.core.Component should be Class<Dynamic>
How would I create a new instance using Type.createInstance of current instance??
try
public function create():MyClass
{
return Type.createInstance(Type.getClass(this),[]);
}
But i don't get why you would do that !!
Related
In gjs docs I found that underscore is used to denote private variables, but what does it do when creating objects with new or calling methods? For example in default code that gets generated when creating extension:
...
let item = new PopupMenu.PopupMenuItem(_('Show Notification'));
item.connect('activate', () => {
Main.notify(_('Whatʼs up, folks?'));
});
this.menu.addMenuItem(item);
...
What you see there is the _() function, which is a shorthand for gettext(). In other words, it marks a string as translatable, and will load the translated string (if available) when it's run by the user.
I build my extbased TYPO3 extension in TYPO3 8.7 . It is a Backend-Module. In the controller, i write my own action to clone the object.
In this example, i want to clone/duplicate the object 'Campaign' and safe it with a modified title, like add the 'copy' text to the title.
But the new object should have also its own new child elements that must be exact copies.
When the action is called, i get only a copy of the Object, but no childs. Is there an example or best case how to handle this task? I did not find, even i found some questions and answers that are on the same topic, but older version. i hope that upd to date, there is a more straight forward solution. Thank you for every hint that points me to the right ideas and maybe an up to date and version example. Here is what i have i my controller. How do i implement recursiv copying of all child elements (and some childs have childs, too)?
/**
* action clone
* #param \ABC\Copytest\Domain\Model\Campaign $campaign
* #return void
* #var \ABC\Copytest\Domain\Model\Campaign $newCampaign
*/
public function cloneAction(\ABC\Copytest\Domain\Model\Campaign $campaign) {
$newCampaign = $this->objectManager->get("ABC\Copytest\Domain\Model\Campaign");
$properties = $campaign->_getProperties();
unset($properties['uid']);
foreach ($properties as $key => $value) {
$newCampaign->_setProperty($key, $value);
}
$newCampaign->_setProperty('title', $properties['title']. ' COPY');
$this->campaignRepository->add($newCampaign);
$this->addFlashMessage('Clone was created', '', \TYPO3\CMS\Core\Messaging\AbstractMessage::OK);
$this->redirect('list');
}
I am aware that this question has been answered a long time ago. But I want to provide my solution to create a deep copy for further reference. Tested on TYPO3 9.5.8.
private function deepcopy($object)
{
$clone = $this->objectManager->get(get_class($object));
$properties = \TYPO3\CMS\Extbase\Reflection\ObjectAccess::getGettableProperties($object);
foreach ($properties as $propertyName => $propertyValue) {
if ($propertyValue instanceof \TYPO3\CMS\Extbase\Persistence\ObjectStorage) {
$v = $this->objectManager->get(\TYPO3\CMS\Extbase\Persistence\ObjectStorage::class);
foreach($propertyValue as $subObject) {
$subClone = $this->deepcopy($subObject);
$v->attach($subClone);
}
} else {
$v = $propertyValue;
}
if ($v !== null) {
\TYPO3\CMS\Extbase\Reflection\ObjectAccess::setProperty($clone, $propertyName, $v);
}
}
return $clone;
}
There is one approach which tackles this usecase from a different POV, namely that request argument values without an identity are automatically put into fresh objects which can then be persisted. This basically clones the original objects. This is what you need to do:
Add a view which has fields for all properties of your object, hidden fields are fine too. This can for example be an edit view with a separate submit button to call your clone action.
Add a initializeCloneAction() and get the raw request arguments via $this->request->getArguments().
Now do unset($arguments[<argumentName>]['__identity']);, do the same for every relation your object has if you want copies instead of shared references.
Store the raw request arguments again via $this->request->setArguments($arguments).
Finally allow the creation of new objects in the property mapping configuration of your argument and possibly all relation properties.
This is how a full initializeCloneAction() could look like:
public function initializeCloneAction()
{
$arguments = $this->request->getArguments();
unset(
$arguments['campaign']['__identity'],
$arguments['campaign']['singleRelation']['__identity'],
);
foreach (array_keys($arguments['campaign']['multiRelation']) as $i) {
unset($arguments['campaign']['multiRelation'][$i]['__identity']);
}
$this->request->setArguments($arguments);
// Allow object creation now that we have new objects
$this->arguments->getArgument('campaign')->getPropertyMappingConfiguration()
->setTypeConverterOption(PersistentObjectConverter::class, PersistentObjectConverter::CONFIGURATION_CREATION_ALLOWED, true)
->allowCreationForSubProperty('singleRelation')
->getConfigurationFor('multiRelation')
->allowCreationForSubProperty('*');
}
Now if you submit your form using the clone action, your clone action will get a fully populated but new object which you can store in your repository as usual. Your cloneAction() will then be very simple:
public function cloneAction(Campaign $campaign)
{
$this->campaignRepository->add($campaign);
$this->addFlashMessage('Campaign was copied successfully!');
$this->redirect('list');
}
If you have "LazyLoadingProxy" instance in your object you need add one more conditions.
if ($propertyValue instanceof \TYPO3\CMS\Extbase\Persistence\Generic\LazyLoadingProxy) {
$objectStorage = $propertyValue->_loadRealInstance();
}
This is my solution for "deepcopy" function:
private function deepcopy($object)
{
$clone = $this->objectManager->get(get_class($object));
$properties = \TYPO3\CMS\Extbase\Reflection\ObjectAccess::getGettableProperties($object);
foreach ($properties as $propertyName => $propertyValue) {
if ($propertyValue instanceof \TYPO3\CMS\Extbase\Persistence\ObjectStorage) {
$objectStorage = $this->objectManager->get(\TYPO3\CMS\Extbase\Persistence\ObjectStorage::class);
foreach ($propertyValue as $subObject) {
$subClone = $this->deepcopy($subObject);
$objectStorage->attach($subClone);
}
} elseif ($propertyValue instanceof \TYPO3\CMS\Extbase\Persistence\Generic\LazyLoadingProxy) {
$objectStorage = $propertyValue->_loadRealInstance();
} else {
$objectStorage = $propertyValue;
}
if ($objectStorage !== null) {
\TYPO3\CMS\Extbase\Reflection\ObjectAccess::setProperty($clone, $propertyName, $objectStorage);
}
}
return $clone;
}
I think a good solution is, to emulate the backend-function.
See the code-example (german text)
http://blog.marcdesign.ch/2015/05/27/typo3-extbase-objekte-kopieren/
The general idea is to extend the TYPO3\CMS\Core\DataHandling\DataHandler and use the parent-method copyRecord. You declare your predefined backend-user to $this->BE_USER in your extend class. The obejct of your predefined backenduser can you get by using the class TYPO3\\CMS\\Backend\\FrontendBackendUserAuthentication and the known name of you predefined backenduser. Your user should have admin-rights and you should define the $BE_USER->uc_default['copyLevels']= '9999'; and declare $BE_USER->uc = $BE_USER->uc_default.
I have not checked, if the declaration $GLOBALS['PAGES_TYPES'][254]['allowedTables'] = '*'; is really needed.
The method copyRecorditself needs mainly the table-name, the uid-value, the pid-value and a language-object as parameters.The languages-object can you get $GLOBALS['lang'], which can although be generated by instanciating \TYPO3\CMS\Lang\LanguageService to $GLOBALS['lang'] and \TYPO3\CMS\Core\Charset\CharsetConverter to $GLOBALS['LANG']->csConvObj.
Sorry about my poor english.
var method = 'serviceName.MethodName'
I Just want to call it like
serviceName.methodName(function(output callback){
});
Is there any approach to call it.thanks
There are two methods that I can think of now.
JS eval
You can use the javascript eval function to convert any string into code snippet like below. Although eval is a quick solution but should not be used unless you dont have any other option by your side.
var method = 'UserService.getData';
eval(method)();
Factory pattern
Use a below pattern to get the service
You would need to define the services in such a manner that you can access them using a pattern.
var Services = {
// UserService and AccountsService are again objects having some callable functions.
UserService : {getData: function(){}, getAge: function(){}},
AccountsService : {getData: function(){}, getAge: function(){}},
// getService is the heart of the code which will get you the required service depending on the string paramter you pass.
getService : function(serviceName){
var service = '';
switch(serviceName){
case 'User':
service = this.UserService;
break;
case 'Accounts':
service = this.AccountsService;
break;
}
return service;
}
}
You can use get the required service with below code
Services.getService('User')
I'm not aware of any way you can resolve the serviceName part of that string to an object, without using eval. So obviously you need to be extremely careful.
Perhaps:
if (method.match(/^[a-zA-Z0-9_]+\.[a-zA-Z0-9_]+$/) {
var servicePart = eval(method.split('.')[0]);
var methodPart = method.split('.')[1];
servicePart[methodPart](...)
}
There are two separate problems in your question:
How to access object property by property name (string)?
How to access object by it's name (string)?
Regarding the first problem - it is easy to access object property by string using the following notation:
const myObject = {
myProp: 1,
};
console.log(myObject['myProp']);
And regarding the second problem - it depends on what serviceName is:
if it is a property of some other object, then use someObject['serviceName']['MethodName']
if it is a local variable, consider using a Map (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map) to associate strings with objects;
I would like to create a custom extension with some dynamic name as
myExt {
aNameChoosenByUser{
firstname = 'toto'
age = 2
}
aNameChoosenByUser2{
firstname = 'tata'
age = 3
}
}
I use usually:
project.extensions.create("myExt", APluginExtension)
but here I do not know when I create the plugin "aNameChoosenByUser", "aNameChoosenByUser2" . I would like let user to define it. And After iterate as it was a HashMap<String,APluginExtension> .
I do not want to define "aNameChoosenByUser" into my plugin.
It is possible to do it with groovy/gradle ?
thanks
What you want to create is a NamedDomainObjectContainer which can be done by calling Project.container() and passing a type. In this case, rather than defining a type for you extension, you'll want to define a type for the model object of the container.
project.extensions.create('myExt', project.container(User.class))
public class User {
String firstname;
String age;
}
I grabbed System.Linq.Dynamic.DynamicQueryable from here:
http://weblogs.asp.net/scottgu/archive/2008/01/07/dynamic-linq-part-1-using-the-linq-dynamic-query-library.aspx
The issue that I am running into is in code that looks like this:
var results = dataContext.GetTable<MyClass>.Select("new (MyClassID, Name, Description)").Take(5);
It appears that if that line of code is executed by multiple threads near simultaneously, Microsoft's dynamic Linq code crashes in their ClassFactory.GetDynamicClass() method, which looks like this:
public Type GetDynamicClass(IEnumerable<DynamicProperty> properties)
{
rwLock.AcquireReaderLock(Timeout.Infinite);
try
{
Signature signature = new Signature(properties);
Type type;
if (!classes.TryGetValue(signature, out type))
{
type = CreateDynamicClass(signature.properties);
classes.Add(signature, type); // <-- crashes over here!
}
return type;
}
finally
{
rwLock.ReleaseReaderLock();
}
}
The crash is a simple dictionary error: "An item with the same key has already been added."
In Ms code, The rwLock variable is a ReadWriterLock class, but it does nothing to block multiple threads from getting inside classes.TryGetValue() if statement, so clearly, the Add will fail.
I can replicate this error pretty easily in any code that creates a two or more threads that try to execute the Select("new") statement.
Anyways, I'm wondering if anyone else has run into this issue, and if there are fixes or workarounds I can implement.
Thanks.
I did the following (requires .NET 4 or later to use System.Collections.Concurrent):
changed the classes field to a ConcurrentDictionary<Signature, Type> ,
removed all the ReaderWriterLock rwLock field and all the code referring to it,
updated GetDynamicClass to:
public Type GetDynamicClass(IEnumerable<DynamicProperty> properties) {
var signature = new Signature(properties);
return classes.GetOrAdd(signature, sig => CreateDynamicClass(sig.properties));
}
removed the classCount field and updated CreateDynamicClass to use classes.Count instead:
Type CreateDynamicClass(DynamicProperty[] properties) {
string typeName = "DynamicClass" + Guid.NewGuid().ToString("N");
...