rails polymorphism problem: I now have questions , articles , comments three models, one question corresponds to multiple comments , and a article corresponds to multiple comments . Now how to submit comments under question ? my model...
suppose that ABCD class, BC virtual inheritance from AMagle D inherited from BC,A class virtual function (not overridden at the same time in BC) and member variables belong to the internal of the class, if both of them solve the ambiguity, it can be solv...
As soon as the project comes in, a page is loaded dynamically, but before the page is loaded, I manually switch to another page, but the original js has not been destroyed, and the code in the urlRouterProvider.when is still executing, which will cause t...
there is a class A , SubA inherits A, but the console reports an error Class constructor xxx cannot be invoked without new how to solve it? A class A{ constructor() {} }; export default A A import A from xxx class SubA extends A{ co...
you can see from the picture that the request header and response header are normal! doesn t see anything wrong, but there is no value in the browser s cookie ! is there something wrong with it? Note: ordinary html+js can be set, but applicatio...
data like getting to the background every tablet is the hard work of the farmers, and it is distributed to Party An in the room. two Every grain is the hard work of the farmers, and it is distributed to Party An in the room. 3. Every grain is the har...
phpword reported an error when operating the word template: ZipArchive::getFromName (): Invalid or uninitialized Zip object means invalid or uninitialized ZIP objects, as shown in the following figure (which I wrote in the laravel framework) it...