I am trying to know which class has called a specific function. I've been looking through the docs for this, but without success. I already know how to get the name of a class, but that is something different of what I'm looking for. I found already something related for java but for dart I haven't. Maybe I'm missing something.
Let's say for example that I have a print function like so:
class A {
void printSomethingAndTellWhereYouDidIt() {
// Here I would also include the class where this function is
// being called. For instance:
print('you called the function at: ...');
//This dot-dot-dot is where maybe should go what I'm looking for.
}
}
class B {
A a = A();
void test() {
a.printSomethingAndTellWhereYouDidIt();
}
}
The output should be something like:
you called the function at: B
Please let me know if there are ways to achieve this. The idea behind is to then use this with a logger, for instance the logging package. Thank you in advance.
You can use StackTrace.current to obtain a stack trace at any time, which is the object that's printed when an exception occurs. This contains the line numbers of the chain of invocations leading up to the call, which should provide the information you need.
class A {
void printSomethingAndTellWhereYouDidIt() {
print(StackTrace.current);
}
}
class B {
A a = A();
void test() {
a.printSomethingAndTellWhereYouDidIt();
}
}
If you are doing this for debugging purposes, you can also set a breakpoint in printSomethingAndTellWhereYouDidIt to check where it was called from.
Related
Im trying to load my model in my controller and tried this:
return Post::getAll();
got the error Non-static method Post::getAll() should not be called statically, assuming $this from incompatible context
The function in the model looks like this:
public function getAll()
{
return $posts = $this->all()->take(2)->get();
}
What's the correct way to load the model in a controller and then return it's contents?
You defined your method as non-static and you are trying to invoke it as static. That said...
1.if you want to invoke a static method, you should use the :: and define your method as static.
// Defining a static method in a Foo class.
public static function getAll() { /* code */ }
// Invoking that static method
Foo::getAll();
2.otherwise, if you want to invoke an instance method you should instance your class, use ->.
// Defining a non-static method in a Foo class.
public function getAll() { /* code */ }
// Invoking that non-static method.
$foo = new Foo();
$foo->getAll();
Note: In Laravel, almost all Eloquent methods return an instance of your model, allowing you to chain methods as shown below:
$foos = Foo::all()->take(10)->get();
In that code we are statically calling the all method via Facade. After that, all other methods are being called as instance methods.
Why not try adding Scope? Scope is a very good feature of Eloquent.
class User extends Eloquent {
public function scopePopular($query)
{
return $query->where('votes', '>', 100);
}
public function scopeWomen($query)
{
return $query->whereGender('W');
}
}
$users = User::popular()->women()->orderBy('created_at')->get();
Eloquent #scopes in Laravel Docs
TL;DR. You can get around this by expressing your queries as MyModel::query()->find(10); instead of MyModel::find(10);.
To the best of my knowledge, starting PhpStorm 2017.2 code inspection fails for methods such as MyModel::where(), MyModel::find(), etc (check this thread), and this could get quite annoying.
One (elegant) way to get around this is to explicitly call ::query() wherever it makes sense to. This will let you benefit from free auto-completion and a nice formatting/indentating for your queries.
Examples
BAD
Snippet where inspection complains about static method calls
// static call complaint
$myModel = MyModel::find(10);
// another poorly formatted query with code inspection complaints
$myFilteredModels = MyModel::where('is_foo', true)
->where('is_bar', false)
->get();
GOOD
Well formatted code with no complaints
// no complaint
$myModel = MyModel::query()->find(10);
// a nicely formatted and indented query with no complaints
$myFilteredModels = MyModel::query()
->where('is_foo', true)
->where('is_bar', false)
->get();
Just in case this helps someone, I was getting this error because I completely missed the stated fact that the scope prefix must not be used when calling a local scope. So if you defined a local scope in your model like this:
public function scopeRecentFirst($query)
{
return $query->orderBy('updated_at', 'desc');
}
You should call it like:
$CurrentUsers = \App\Models\Users::recentFirst()->get();
Note that the prefix scope is not present in the call.
Solution to the original question
You called a non-static method statically. To make a public function static in the model, would look like this:
public static function {
}
In General:
Post::get()
In this particular instance:
Post::take(2)->get()
One thing to be careful of, when defining relationships and scope, that I had an issue with that caused a 'non-static method should not be called statically' error is when they are named the same, for example:
public function category(){
return $this->belongsTo('App\Category');
}
public function scopeCategory(){
return $query->where('category', 1);
}
When I do the following, I get the non-static error:
Event::category()->get();
The issue, is that Laravel is using my relationship method called category, rather than my category scope (scopeCategory). This can be resolved by renaming the scope or the relationship. I chose to rename the relationship:
public function cat(){
return $this->belongsTo('App\Category', 'category_id');
}
Please observe that I defined the foreign key (category_id) because otherwise Laravel would have looked for cat_id instead, and it wouldn't have found it, as I had defined it as category_id in the database.
You can give like this
public static function getAll()
{
return $posts = $this->all()->take(2)->get();
}
And when you call statically inside your controller function also..
I've literally just arrived at the answer in my case.
I'm creating a system that has implemented a create method, so I was getting this actual error because I was accessing the overridden version not the one from Eloquent.
Hope that help?
Check if you do not have declared the method getAll() in the model. That causes the controller to think that you are calling a non-static method.
For use the syntax like return Post::getAll(); you should have a magic function __callStatic in your class where handle all static calls:
public static function __callStatic($method, $parameters)
{
return (new static)->$method(...$parameters);
}
I have a button in my application that return :
onPressed: () {
return context
.read(FavoriteIds.provider.notifier)
.toggle(doa.id.toString());
},
In this case, i used a riverpod provider. But when i want to import a flutter_bloc package, the read keyword will be error with this message
A member named 'read' is defined in extensions 'ReadContext' and 'BuildContextX' and neither is more specific. Try using an extension override to specify the extension you want to to be chosen.
Please help me solve this problem. thank you :)
Here the problem is read() is defined in both ReadContext & BuildContextX extensions. So the compiler is not getting which extension to use.
To solve the error, use : ReadContext(context).read if you wanna access bloc or BuildContextX(context).read() as per your need.
This means you are importing 2 extensions that both supply the same method read. Consider this example:
extension Ext1 on String {
void foo() => print("from extension 1");
}
extension Ext2 on String {
void foo() => print("from extension 2");
}
void main() {
String s = "hello";
s.foo();
}
What should this code print? There isn't an obvious answer, and to avoid accidental programming errors, Dart prohibits this.
You could try "go-to definition" (ctrl/cmd click in most IDEs) on the read method to navigate to one of the files that it is defined in, and then delete the corresponding import statement.
However, it might be quicker to just delete all the import statements in that file and add them back with autocomplete
I have a class in c++ that I'm wrapping into python with pybind11. That class has a std::function, and I'd like to control how the arguments to that function are dealt with (like return value policies). I just can't find the syntax or examples to do this...
class N {
public:
using CallbackType = std::function<void(const OtherClass*)>;
N(CallbackType callback): callback(callback) { }
CallbackType callback;
void doit() {
OtherClass * o = new OtherClass();
callback(o);
}
}
wrapped with
py::class_<OtherClass>(...standard stuff...);
py::class_<N>(m, "N")
.def(py::init<N::CallbackType>(),
py::arg("callback"));
I all works: I can do this in python:
def callback(o):
dosomethingwith(o)
k = N(callback)
, but I'd like to be able to control what happens when callback(o); is called - whether python then will take ownership of the wrapped o variable or not, basically.
I put a printout in the destructor of OtherClass, and as far as I can tell, it never gets called.
OK, I think I figured it out:
Instead of std::function, use a pybind11::function:
using CallbackType = pybind11::function
and then
void doit(const OtherClass &input) {
if (<I want to copy it>) {
callback(pybind11::cast(input, pybind11::return_value_policy::copy));
} else {
callback(pybind11::cast(input, pybind11::return_value_policy::reference));
}
}
I see nothing in pybind11/functional that allows you to change the ownership of the parameters at the point of call, as the struct func_wrapper used is function local, so can not be specialized. You could provide another wrapper yourself, but in the code you can't know whether the callback is a Python function or a bound C++ function (well, technically you can if that bound C++ function is bound by pybind11, but you can't know in general). If the function is C++, then changing Python ownership in the wrapper would be the wrong thing to do, as the temporary proxy may destroy the object even as its payload is stored by the C++ callback.
Do you have control over the implementation of class N? The reason is that by using std::shared_ptr all your ownership problems will automagically evaporate, regardless of whether the callback function is C++ or Python and whether it stores the argument or not. Would work like so, expanding on your example above:
#include <pybind11/pybind11.h>
#include <pybind11/functional.h>
namespace py = pybind11;
class OtherClass {};
class N {
public:
using CallbackType = std::function<void(const std::shared_ptr<OtherClass>&)>;
N(CallbackType callback): callback(callback) { }
CallbackType callback;
void doit() {
auto o = std::make_shared<OtherClass>();
callback(o);
}
};
PYBIND11_MODULE(example, m) {
py::class_<OtherClass, std::shared_ptr<OtherClass>>(m, "OtherClass");
py::class_<N>(m, "N")
.def(py::init<N::CallbackType>(), py::arg("callback"))
.def("doit", &N::doit);
}
Say we have the UserCrudController like so:
public function setup()
{
// ...
// This works:
$this->crud->addClause('active');
// ...
}
The addClause() works fine. Now say we add it outside the setup():
public function posts()
{
// ...
// This DOES NOT work:
$this->crud->addClause('active');
// ...
}
Calling addClause() outside like this works, but if its inside a logic, it does not:
public function setup()
{
// This works:
$this->applyQueries();
}
private function applyQueries()
{
// This works:
$this->crud->addClause('active');
// This DOES NOT work:
if (true)
$this->crud->addClause('active');
}
Recap: I need to call addClause() from another function and inside a logic. How?
If you're creating a custom method, there's no way for Backpack to know what you want to do inside that method. Only what you write inside it will happen, in addition to what's in setup(), which is called in the __constructor().
Depending on your use case (list/create/edit/preview/etc), I recommend you take a look at the logic inside Backpack's CrudController. The methods there contain the logic for the operations above, and do use the addClause(). Copy-paste whatever you need to your posts() method. You'll basically be able to use the query where the clauses have been added by taking advantage of the $this->crud object, so the query would be $this->crud->query.
I'm trying to customize the quick create view to add a default value of a field in Sugar Community Edition 6.5.24
Similar code works fine for ViewEdit, but it seems never called in subpanels.
Current file is
custom/modules/Opportunities/views/view.quickcreate.php
Unfortunately the constructor is not invoked.
Any help very appreciated.
<?php
require_once('include/MVC/View/views/view.quickcreate.php');
class OpportunitiesViewQuickcreate extends ViewQuickcreate {
function OpportunitiesViewQuickcreate(){
parent::ViewQuickcreate();
}
function preDisplay() {
parent::preDisplay();
$_REQUEST['custom_field_c'] = "a value for this field";
}
}
After tens of trying, I've found solution.
The right way is to extend SubpanelQuickCreate in the file custom/modules/Opportunities/views/view.subpanelquickcreate
require_once('include/EditView/SubpanelQuickCreate.php');
class OpportunitiesSubpanelQuickcreate extends SubpanelQuickCreate {
function OpportunitiesSubpanelQuickcreate() {
$_REQUEST['custom_field_c'] = "a value for this field";
parent::SubpanelQuickCreate("Opportunities");
}
}
Going from memory, so I may be wrong, but try adding $this->useForSubpanel = true; in your constructor.