mixins

问题 I am have recently started learning DjangoRestFramework and I came across two ways to create model instances, one is through Django Rest Framework CreateAPIView and the other is CreateModelMixin. So I wanted to know what is the difference between them and also between the other mixins and Views which perform identical functions. 回答1: Here's the difference: mixins are (as described in the code comments) the basic building blocks for generic class based views - they're basically view-agnostic

问题 I write my CSS with Lesscss using it on client side (with compiler less.js). There are good examples for guards usage in documentation, but it don't work for me. I can't understand, why... Code example goes here: @import "common-functions.less"; // variables @minHeaderWidth: auto; @maxHeaderWidth: 1200px; @minButtonsWidth: 50px; @maxButtonsWidth: 75px; // Mixins with guards .applyHeaderStyles(@headerWidth, @buttonsWidth) when (ispixel(@headerWidth)) { .my-headerElement { width: @headerWidth;

问题 Is it possible to determine number of children of any container using any SASS function? For example, I have a container which has 3 columns: <div class="columns columns_3"> <div class="column"></div> <div class="column"></div> <div class="column"></div> </div> For this container, I want to implement a mixin which is +columns_3 But if the container has nth number of children, mixin will be +columns_n 回答1: What you want is to know how many childs haves an element and set the right class to it.

问题 Let's say I have a bunch of related functions that have no persistent state, say various operations in a string differencing package. I can either define them in a class or module (using self ) and they can be accessed the exact same way: class Diff def self.diff ... def self.patch ... end or module Diff def self.diff ... def self.patch ... end I can then do Diff.patch(...) . Which is 'better' (or 'correct')? The main reason I need to group them up is namespace issues, common function names

问题 I'm using SimpleModule to register the MixIn with Serialization and Deserialization. I am unable to make it work. The classes are shown below. WHen I print the serialized string I see the size printed and properties are not named as I specified in the mixin. It is printing {"w":5,"h":10,"size":50} . So mix-in registration with both serializer and deserialization configurations was unsuccessful. What am I doing wrong. MixIn Class: import org.codehaus.jackson.annotate.JsonIgnore; import org

问题 I have a third party library class (from Apache Axis) that I want to serialize by Jackson JSON: public class NonNegativeInteger extends BigInteger { public NonNegativeInteger(byte[] val) { super(val); checkValidity(); } // ctor public NonNegativeInteger(int signum, byte[] magnitude) { super(signum, magnitude); checkValidity(); } // ctor public NonNegativeInteger(int bitLength, int certainty, Random rnd) { super(bitLength, certainty, rnd); checkValidity(); } // ctor public NonNegativeInteger

问题 This question already has an answer here : Pass function or mixin by reference in SASS (1 answer) Closed 4 years ago . I'm trying to create a mixin in Sass to use for the :hover actions but I can't make it work. I declare the mixin: @mixin hover($action, $color, $amount) { color: $action($color, $amount); } My idea is to use Sass Script Funcions to change the color of the link on hover by basically lightening or darkening it. So for example I try: a { &:hover { @include hover(darken, $footer

问题 I need help using class mixins in declaration files. Specifically, when a method is defined in a mixin, typescript is not picking it up in the mixed class body: In my case, I am applying two mixins. The first mixin - NotifyingElementMixin - provides a method called notify , and it's this method which is failing to apply to the mixed class body notifying-element-mixin.js export const NotifyingElementMixin = superclass => class NotifyingElement extends superclass { /** * Fires a `*-changed`

问题 I am trying to achieve a cross browser CSS background image SVG. In a mixin so I can dynamically use the SVG in different colours by calling the mixin. I have the following example which I have run through the optimiser on this page http://codepen.io/tigt/post/optimizing-svgs-in-data-uris which I am trying to use to prove the idea. But while it works in Chrome and Edge, I can't figure out how to get it to work in FF or IE11. Providing a fall back is tricky because I need to use quite a number

问题 Is there a best practice way to pass params to mixed-in methods? The class using the mixin could set up instance variables which mixed-in methods expect, or it could pass all necessary params as arguments to mixed-in methods. The background to this is that we have a Rails controller which does publishing of content - but other controllers and even Models need to be able to "act as publshers" so I'm factoring the controllers methods into a Module which I'll mixin as needed. Here, for example,