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问题 I'm using react-native and I am trying to update the pods by using pod update But it updates nothing. However, when I use pod outdated It shows this Updating spec repo `master` $ /usr/bin/git -C /Users/IG/.cocoapods/repos/master fetch origin --progress remote: Counting objects: 15, done. remote: Compressing objects: 100% (14/14), done. remote: Total 15 (delta 11), reused 0 (delta 0), pack-reused 0 From https://github.com/CocoaPods/Specs 1bb3a72da66..f6d4f6f0e14 master -> origin/master $ /usr

问题 This question already has answers here : Javascript 2d array indexOf (10 answers) Closed 5 years ago . I have the following code: alert( [[0,1],[1,0]].indexOf([0,1]) ); And even though the array [0,1] is an element of the two-dimensional array, I get a value of '-1' returned. What have I done wrong in life? 回答1: It doesn't find your element because [0, 1] and [0, 1] are not equal in the same way that 4 and 4 are. console.log(4 === 4); // true console.log([0, 1] === [0, 1]); // false When you

问题 I am building a BlogApp and I am stuck on an Error and I keep getting this error :- The Post could not be created because the data didn't validate. What i am trying to do I made a feature that users cannot insert past date in DateTimeField . AND If user enters the past date in field then a Validation Error should be display. AND i was testing it and suddenly a new error is occured. forms.py class PostForm(forms.ModelForm): date = forms.DateTimeField(initial=timezone.now) def clean_date(self):

问题 I want to use the session ID to identify the records in the database for anonymous user. When the user logs in, I would like to bind/relate the data to the user id. However, after logging in the session id is automatically changed by what I lose data binding with the user. How can I keep the session id after logging in order to bind the user id to the data, and then change the session id? 回答1: Upon authentication, session should be migrated, unless configured otherwise. Indeed, the session ID

问题 I'm using ffmpeg to scale my WEBM file, by using below command: ffmpeg -i in.webm -c:v libvpx -vf scale=100:100 out.webm The output has correct resolution as I expected but the problem is transparency become black background. Could someone give me a solution for this. Thank you so much. Below is the log of the operation: ffmpeg version 3.4 Copyright (c) 2000-2017 the FFmpeg developers built with gcc 7.2.0 (GCC) configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib -

问题 Goal: I'm trying to loop a video infinitely on a React gatsby site. I have a mp4 file locally under assets, but it doesn't show up on my screen. What I've tried: I thought it might be a CSS issue so I set it and it's clearly width and height 100% of the window but video is still not showing up. JS: import React from "react" import "./index.css" export default () => ( <div> <video id="background-video" loop autoPlay> <source src="..\assets\video\Cenote_Squad_Cinemagraph_1500x840_Final.mp4"

问题 Goal: I'm trying to loop a video infinitely on a React gatsby site. I have a mp4 file locally under assets, but it doesn't show up on my screen. What I've tried: I thought it might be a CSS issue so I set it and it's clearly width and height 100% of the window but video is still not showing up. JS: import React from "react" import "./index.css" export default () => ( <div> <video id="background-video" loop autoPlay> <source src="..\assets\video\Cenote_Squad_Cinemagraph_1500x840_Final.mp4"

问题 I am building a BlogApp and I am stuck on an Error and I keep getting this error :- The Post could not be created because the data didn't validate. What i am trying to do I made a feature that users cannot insert past date in DateTimeField . AND If user enters the past date in field then a Validation Error should be display. AND i was testing it and suddenly a new error is occured. forms.py class PostForm(forms.ModelForm): date = forms.DateTimeField(initial=timezone.now) def clean_date(self):

问题 I need to group the records based on ID and display sum of weight. can someone please let me know the sum and group by method in Angular. API Response: data = [ {Id:1, name: 'ABC', weight: 10 }, {Id:1, name: 'ABC', weight: 14 }, {Id:1, name: 'ABC', weight: 16 }, {Id:2, name: 'DEF', weight: 23 }, {Id:2, name: 'DEF', weight: 22 }, {Id:4, name: 'GHI', weight: 44 }, {Id:4, name: 'GHI', weight: 41 } ] Expected output: dataResult = [ {Id:1, name: 'ABC', weight: 40 }, {Id:2, name: 'DEF', weight: 45

问题 So We have an Amazon RDS server running with the following specs. Instance Class: r3.xlarge My issue is when the MySQL server experiences multiple concurrent connections (connections in range of 30-40), The CPU reaches its peak. However according to the monitoring stats, it should be able to handle connections well above that. Here is the output for mysqltuner >> MySQLTuner 1.7.1 - Major Hayden <major@mhtx.net> >> Bug reports, feature requests, and downloads at http://mysqltuner.com/ >> Run