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...
import React from react ; import ReactDOM from react-dom ; import {HashRouter as Router, Route, Switch} from react-router-dom import {createStore, applyMiddleware, compose} from redux import thunk from react-thunk import {Prov...
I am now working on the secondary development of jenkins. I need to create a credentials, when adding a slave node in jenkins, but I need to provide crumb, when creating it through a http request. Do you know how to get crumb? Try curl-s http: user:to...
topic description Your task is to drive your car from 1 to 60 Kilometers per hour by printing a pattern. A hyphen represents the speed of cars. one hyphen is counted as 1 kph. To put it simply, output 1 to 60 hyphens in turn. sources of topics an...
the merging of multiple tables is not valid in the case of circular rendering. The code is as follows: <el-table :data="item" v-for="(item, index) in partApplyData" :key="index" style=&quo...
when learning vue, I want to trigger a function when the data changes, so I write it in double parentheses and find that it can be executed when the data changes, as follows: {{f()}} 2 <input v-model="a"> data:{ a: 1 , b: 2 ...