callback

问题 I am using PostgreSql as database and Rails 3.1.3 and ruby 1.9.3 I have 3 models. Activity ActivityObject ActivityObjectActivity They are related this way. Activity has_many :activity_object_activities,:dependent => :destroy has_many :activity_objects, :through => :activity_object_activities after_destroy :do_something_on_activity_object_related ActivityObject has_many :activity_object_activities, :dependent => :destroy has_many :activities, :through => :activity_object_activities

问题 I am using PostgreSql as database and Rails 3.1.3 and ruby 1.9.3 I have 3 models. Activity ActivityObject ActivityObjectActivity They are related this way. Activity has_many :activity_object_activities,:dependent => :destroy has_many :activity_objects, :through => :activity_object_activities after_destroy :do_something_on_activity_object_related ActivityObject has_many :activity_object_activities, :dependent => :destroy has_many :activities, :through => :activity_object_activities

问题 I am using PostgreSql as database and Rails 3.1.3 and ruby 1.9.3 I have 3 models. Activity ActivityObject ActivityObjectActivity They are related this way. Activity has_many :activity_object_activities,:dependent => :destroy has_many :activity_objects, :through => :activity_object_activities after_destroy :do_something_on_activity_object_related ActivityObject has_many :activity_object_activities, :dependent => :destroy has_many :activities, :through => :activity_object_activities

问题 What I have: So I have a class with a private member, and a static function. The function must really be static and I can't change that. What I want: I need to access, from the static function, the private member. Any ideas? :) Please check the code bellow: class Base { private: int m_member; public: Base() : m_member(0) {}; ~Base() {}; static void key_callback(GLFWwindow* window, int key, int scancode, int action, int mode); /* This must really be static because it is coming from C */ };

问题 I don't get how I'm supposed to get the reference of the app instance in the callback method. I've been looking at this: How to access the correct this inside a callback? but didn't really feel that I got something from it. class App { constructor() { this.imageHandler = new ImageHandler(); this.imageHandler.loadImages(["img.jpg"], this.create); } create() { console.log("Here 'this' is undefined"); console.log(this.imageHandler.images[0]); } } class ImageHandler { constructor() { this.images

问题 I've a Entity with @HasLifecycleCallbacks for define prePersist and preUpdate method. My PrePersist method is /** * @ORM\OneToMany(targetEntity="Field", mappedBy="service", cascade={"persist"}, orphanRemoval=true) */ protected $fields; /** * @PrePersist() */ public function populate() { $fieldsCollection = new \Doctrine\Common\Collections\ArrayCollection(); $fields = array(); preg_match_all('/%[a-z]+%/', $this->getPattern(), $fields); if (isset($fields[0])) { foreach ($fields[0] as $field

问题 The title pretty much says it all. If you have a callback from one class to another and need to call some method from within the callback that requires a context what is the correct context to use? A common example would be an AsyncTask with a callback to the Activity or Fragment that used it. I generally try to avoid using getApplicationContext() but I cannot use this as the context from within a callback. Is this a case where using a broader context is appropriate? To clarify further I'm

问题 The title pretty much says it all. If you have a callback from one class to another and need to call some method from within the callback that requires a context what is the correct context to use? A common example would be an AsyncTask with a callback to the Activity or Fragment that used it. I generally try to avoid using getApplicationContext() but I cannot use this as the context from within a callback. Is this a case where using a broader context is appropriate? To clarify further I'm

问题 How can I add a setTimeout to my async await function call? I have request = await getProduct(productids[i]); where const getProduct = async productid => { return requestPromise(url + productid); }; I've tried request = await setTimeout((getProduct(productids[i])), 5000); and got the error TypeError: "callback" argument must be a function which makes sense. The request is inside of a loop which is making me hit the rate limit on an api call. exports.getProducts = async (req, res) => { let

问题 How can I add a setTimeout to my async await function call? I have request = await getProduct(productids[i]); where const getProduct = async productid => { return requestPromise(url + productid); }; I've tried request = await setTimeout((getProduct(productids[i])), 5000); and got the error TypeError: "callback" argument must be a function which makes sense. The request is inside of a loop which is making me hit the rate limit on an api call. exports.getProducts = async (req, res) => { let