mutators | 易学教程

Using .splice method in subclass of Array in javascript?

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问题 I am trying to create a subclass of javascript's Array. I want to initiate subclass with array-type argument and add a method to remove an element from the array (subclass). My code looks like this: class CustomArray extends Array { constructor(array) { console.log('Initiating array:', array) super(...array); } remove(element) { let index = this.indexOf(element); if (index > -1) { return this.splice(index, 1); } return []; } } var a = ['a', 'b', 'c', 'd', 'e']; var list = new CustomArray(a)

Force eloquent to use mutators during serialization

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问题 Is there a way to force eloquent to use mutators when serializing data? I am currently converting my app to use vue.js and several fields are computed within the model, which I need to be included, in the serialized data. Eloquent\Model - make toArray() utilize mutators I understand why Taylor does not honour mutators but is there a way to override this behaviour? 回答1: Before returning the model, you can do this $model->setAppends(['mutator_1', 'mutator_2']); return $model->toArray(); if you

Accessor & Mutator methods (Python)

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问题 I am trying to figure out encapsulation in Python. I was doing a simple little test in shell to see how something worked and it doesn't work like I was expecting. And I can't get it to work. Here's my code: class Car: def __init__(self, carMake, yrMod): self.__make = carMake self.__yearModel = yrMod self.__speed = 0 #Mutator Methods def set_make(self, make): self.__make = carMake def set_model(self, yrMod): self.__yearModel = yrMod #def set_speed(self, speed): #self.__speed = speed #Accessor

Python property descriptor design: why copy rather than mutate?

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问题 I was looking at how Python implements the property descriptor internally. According to the docs property() is implemented in terms of the descriptor protocol, reproducing it here for convenience: class Property(object): "Emulate PyProperty_Type() in Objects/descrobject.c" def __init__(self, fget=None, fset=None, fdel=None, doc=None): self.fget = fget self.fset = fset self.fdel = fdel if doc is None and fget is not None: doc = fget.__doc__ self.__doc__ = doc def __get__(self, obj, objtype

Getting a null value for where i expect a string set by the mutator

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问题 Following is the servlet class that sets the name by invoking a method on the object of a bean class and then forwards to a jsp page . package BeanTesters; import javax.servlet.*; import javax.servlet.http.*; import java.io.IOException; public class Controller extends HttpServlet { @Override public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException,ServletException { Bean bean = new Bean(); bean.setName("Suhail Gupta"); //request.setAttribute("name", bean);

Using accessor mutator with a belongsTo relationship

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问题 Using Laravel 4 and I have a mutator set up in my User model: public function getFullnameAttribute($value) { return $this->first_name. ' ' .$this->last_name; } But I have a relationship set up in my Cars model for a user ID linked to that car: public function salesManager() { return $this->belongsTo('User', 'sales_manager')->select('first_name', 'last_name'); } I am calling that relationship on my Car table: $cars = Car::with('marqueBasic', 'modelBasic', 'salesManager') ->get(); Now, how can

Understanding struct-field mutation

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问题 From the Rust book about how to mutate struct fields: let mut point = Point { x: 0, y: 0 }; point.x = 5; and later: Mutability is a property of the binding, not of the structure itself. This seems counter-intuitive to me because point.x = 5 doesn't look like I'm rebinding the variable point . Is there a way to explain this so it's more intuitive? The only way I can wrap my head around this is to "imagine" that I'm rebinding point to a copy of the original Point with a different x value (not

Tabulator date formatting

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问题 I am using a library called Tabulator, and one of the things it allows you to do is to edit the data while it is being pushed into the table. Dates we use use long-date format and look something like this: 2018-07-24T04:00:00.000Z . I use formatter within the table to make it look like this : 2018-07-24 . Which simply slices the string. The problem is - when someone is trying to download pdf file it still shows the date in the long format - this needs to be fixed. I tried all the ways that

C++ function in parent return child

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问题 To be honest, I don't really know, how to ask this question, so please don't be mad :) Anyway, I want to have the mutators (setters) in my class to return this to allow for jQuery-like a.name("something").address("somethingelse"); I have a parent class ( Entity ) and several childclasses ( Client, Agent etc. ). The mutators for most things are inherited from the Entity class (like name or address), but they return an Entity object, so I can't call Client mutators on them. In other words: //

laravel problems with mutators

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My journey into laravel 4 (from laravel 3) continues.... I have an Article model, accessing a table called articles. I have set up the model with the following mutators: class Article extends Eloquent { public function getArticleDateAttribute($value) { return date('d/m/Y', strtotime($value)); } public function getValidUntilAttribute($value) { return date('d/m/Y', strtotime($value)); } } Now when I query the database with the following AND Delete the mutators everything works as expected and I get the data I expect: public function getTest() { $data = Article::select(array( 'articles.id',