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Updating Packages4:50 with Jeremy McLain
How to use NuGet and semantic versioning keep dependencies up to date.
You may have noticed this number up here by the word Updates. 0:00 This is the number of packages in our project that aren't 0:03 updated to the latest version. 0:06 All of these packages were installed when we created the ASP.NET MVC project. 0:08 So you might be wondering why it didn't install the latest version. 0:13 Could it be that ASP.NET MVC won't work with the latest versions? 0:17 ASP.NET MVC can work with the latest versions of most, 0:22 actually I think all of these packages. 0:26 The reason the latest version wasn't installed is because the ASP.ET MVC 0:29 project template was created a while ago. 0:33 And most of these libraries have released newer versions sense then. 0:36 Looking through them, it looks like they're all pretty common libraries and 0:40 are probably all using semantic versioning. 0:44 So we can tell if we can safely update them by looking at their version numbers. 0:47 Remember only a change to the major version number means it might contain some 0:52 breaking changes. 0:56 Updating the library to a higher or 0:57 lower major version than the one we're already using, may break our software. 0:59 The safest bet is to update these all to the latest patch version number. 1:04 But updating them to the latest minor version number is reasonably safe too. 1:09 Here's something to be aware of when updating multiple packages. 1:13 If I were to click Select all packages and 1:17 then click Update, it would update all of these packages to the latest version. 1:20 That's the version shown here under the current version number. 1:26 Looking at Newtonsoft.Json, 1:31 this means we'd be updating from major version six to major version eight. 1:33 That's a big jump. 1:39 The only other package where the major version numbers don't match is jQuery. 1:40 Here we'd be going from jQuery1 to jQuery2. 1:45 With everything else only the minor and patched version numbers change. 1:50 Let's uncheck Json and jQuery and click Update. 1:54 We can double check what we're doing in the confirmation dialog that pops up, and 2:03 then agree to the licenses. 2:07 For now we can ignore this error about Visual Studio needing to restart. 2:12 This is a temporary issue with the Microsoft.net.compilers package. 2:17 Now everything is updated to latest except for jQuery and Json. 2:22 What about these two? 2:28 It's times like these that we really need to know about the libraries we're using. 2:29 Well it's always good to have a reasonable knowledge about the libraries we're using. 2:33 Let's click on jQuery and then look at its version history. 2:37 Let's take a look at the details for the first release of jQuery 2. 2:44 Wow, it says here that it was released way back in 2013. 2:51 That's a full three years prior to the time this workshop was recorded. 2:56 Now we need to figure out why Microsoft decided to have ASP.NET MVC use 3:00 version one of the library instead of the latest and greatest. 3:04 If we looked at the release notes for jQuery 2, 3:08 we'd learn that it doesn't support version eight or earlier of Internet Explorer. 3:11 That's why the major version number of jQuery was 3:15 changed when it released jQuery 2. 3:18 Internet Explorer 8 is a pretty old web browser by now and 3:20 I doubt the people using this Web app will be using it. 3:24 So I think it's safe to update this one to the latest. 3:27 Now for Json. 3:31 Honestly I don't know why Microsoft wants to use version six. 3:33 Version seven was released nearly a year ago. 3:37 I'll update this to the latest as well, but 3:43 I'll be taking a risk that something will break in my app. 3:45 Updating a library might cause my project's build to fail. 3:50 Or worse, it might cause a latent bug that won't be discovered until runtime. 3:54 This is one of the reasons why vigilant developers write good unit test and 3:59 test their code before and 4:03 after making big changes like updating the versions of the libraries. 4:04 If we find that an updated package causes some issues, 4:08 we can always revert back by updating to a previous version of the package. 4:11 The other way we could have updated all of these packages to the latest minor version 4:15 is to use NuGet's Package Manager Console. 4:19 We can open the console by clicking Tools > 4:23 NuGet Package Manager > Package Manager Console. 4:25 Anything we can do in the NuGet graphical user interface 4:28 we can do with the console, and more. 4:32 I've included a link to information on how to use the console in the teacher's 4:34 notes of this workshop. 4:38 Also any command line tools that come in NuGet packages can be run here. 4:39 For example, we can run Entity Framework's migrate command from here because it's in 4:43 the tools directory of the Entity Framework package. 4:47
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