mixins

问题 I found examples of a mixin that makes assumptions about what instance variables an including class has. Something like this: module Fooable def calculate @val_one + @val_two end end class Bar attr_accessor :val_one, :val_two include Fooable end I found arguments for and against whether it's a good practice. The obvious alternative is passing val_one and val_two as parameters, but that doesn't seem as common, and having more heavily parameterized methods could be a downside. Is there

问题 I have created a function in global.function.js file as function getData(flag) { if (flag === 1) { return "one"; } else { return "not one"; } } which then is imported using custom-js-import.html element: <script src="global.function.js"></script> When I tried to access the above function in custom-element.html , I am able to access it in the script part but not in the template part. Is there any way I can access the function inside the HTML element? <!-- custom-element.html --> <link rel=

问题 I have created a function in global.function.js file as function getData(flag) { if (flag === 1) { return "one"; } else { return "not one"; } } which then is imported using custom-js-import.html element: <script src="global.function.js"></script> When I tried to access the above function in custom-element.html , I am able to access it in the script part but not in the template part. Is there any way I can access the function inside the HTML element? <!-- custom-element.html --> <link rel=

问题 I'm using Ember CLI 1.13 and I'm attempting to create a router mixin in an addon that binds to the willTransition hook, but the issue I'm encountering is not limited to this event. At this point the mixin looks like such: import Ember from 'ember'; export default Ember.Mixin.create({ genericFunction: function(transition) { console.log('--- generic function ---'); }.on('willTransition') }); When attempting to run the dummy app utilising the mixin, I get the following error: Uncaught TypeError:

问题 I'm working on creating a complex mixin for using CSS grid. At the moment what I have is a mixin that you pass in the no of cols , row-gap and column-gap and it returns you a blob - code is below. NB rem() is a function I'm using to convert px to rem . @mixin grid($grid-type, $no-of-cols, $row-gap, $columnn-gap: $row-gap) { @supports (display: grid) { display: grid; #{$grid-type}: repeat($no-of-cols, auto); grid-gap: rem($row-gap) rem($column-gap); } } This works fine but the problem is if I

问题 Hey guys I'm new here but hope my question is clear. My code is written in Python. I have a base class representing a general website, this class holds some basic methods to fetch the data from the website and save it. That class is extended by many many other classes each representing a different website each holding attributes specific to that website, each subclass uses the base class methods to fetch the data. All sites should have the data parsed on them but many sites share the same

问题 I'm trying to serialize a collection using mixings, but Jackson won't save the type info. This is a basic test illustrating what happens: public class CollectionSerializationTest { interface Common extends Serializable { } class A implements Common { private static final long serialVersionUID = 1L; } @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type") @JsonSubTypes({ @JsonSubTypes.Type(value = A.class, name = "CODE") }) class AMixIn { }

问题 I've created a mixin and inherited from it in some models. The problem is when I create a schema migration, the mixin's fields are there. class MyMixin(object): a_field = models.CharField(max_length=30, blank=True) another_field = models.DateTimeField(blank=True, null=True) class Meta: abstract = True class MyModel(models.Model, myMixin): ... Any ideas? 回答1: Seem to have got it working using the following class MyMixin(models.Model): a_field = models.CharField(max_length=30, blank=True)

问题 I'm using Bootstrap 4 and I would like to change default style of button hover and active states. Those can't be changed with variables because those are hard coded in Sass mixins. For example: @mixin button-variant($color, $background, $border) { $active-background: darken($background, 10%); $active-border: darken($border, 12%); ... In order to get the style I want, I need to change darken to lighten and then change percents. I could modify source code but it doesn't sound like a good

问题 I'm using Bootstrap 4 and I would like to change default style of button hover and active states. Those can't be changed with variables because those are hard coded in Sass mixins. For example: @mixin button-variant($color, $background, $border) { $active-background: darken($background, 10%); $active-border: darken($border, 12%); ... In order to get the style I want, I need to change darken to lighten and then change percents. I could modify source code but it doesn't sound like a good