词汇：just

adv. 正好，恰好；只是，仅仅；刚才，刚刚；实在；刚要

相关场景

16:03:
Now, we're also gonna add a number of partials here. This is the templating system, basically, a sub-routine that you can refer to. There's gonna be three of them that includes the entire comment section. We're gonna reference that in our post show in just a second. And within that, we're gonna refer to another partial for an individual comment, and another partial again for the new setup. So, let's paste some of that in here, You can see this for the entire collection, it just has an H2 for the comments, and we render the post comments. This again uses Rails' convention over the configuration approach.
>> Rails 8.0.1 You are in good company
So, let's run the migration for that, that sets up the comments table. You can see here the schema that we've now built up. We've added a number of tables for action text and action storage. And then, we have added a comments table. That's what you can see here. As we had it in the migration where we were just referencing the post as a foreign key, and then we had the content as text.
>> Rails 8.0.1 You are in good company
Alright! Now let's add some comments to our blogging system! And I'm gonna use a different generator here,I'm gonna use a resource generator that is a little lighter than the one we were using for scaffold that doesn't generate a bunch of views, and doesn't generate all sorts of actions in the controller by default, but it does generate the new model that we need the comment model, it generates a migration for that, create comments ,and it generates just some empty placeholders for the comments controller and for the view action.
>> Rails 8.0.1 You are in good company
But we can also have a look at a specific file, you'll see it matches exactly what we have back there. That's not a development setup! That is what we're shipping in production. There is no minification, there's no transpilation, there's none of that nonsense because you just don't need it.
>> Rails 8.0.1 You are in good company
inspector:
But really, what's unique here for Rails is the fact that we're using no build by default! So if I go over here in the inspector and look at the JavaScript files that are included,you can see we have the application js file with a little digest stamp on there. If we change anything that application js file, the digest is going to change, and the browser will redownload just the part!
>> Rails 8.0.1 You are in good company
Just a nice feature.
>> Rails 8.0.1 You are in good company
And we're gonna start local time here. And in the local time, we're gonna use it, and we're gonna use it for adding the updated at timestamp here. And as you can see here, we're just adding a time tag that's just a vanilla HTML tag that has a data local time that's what activates that local time JavaScript set up.
>> Rails 8.0.1 You are in good company
And then, there's the stimulus framework for creating that additional functionality that you might need in a really simple way. You can have a look at hotwire.dev to see more about that, but what we're gonna add here is a little piece of JavaScript to just add some additional functionality, pulling something in from pin.
>> Rails 8.0.1 You are in good company
As you can see here, there is now a full WYSIWYG interface for creating the body. It comes with a default set of styles for the toolbar, you can change those, those styles are generated straight into your application, so you can make it look nice for yourself. Let's give some bold and italic text here, you see, that was all that was needed. but I think what's even nicer to look at here is if we do an upload and we add a file, you will see that file gets added with a preview directly to the WYSIWYG editor. And if we save that and we update the post, it is added to the post itself. And that then went through the whole process of doing a direct upload of the file when we dropped it into the editor, that uploads it straight to active storage. And then, we have access to that, and rendering it directly from whatever storage backend active storage is using. In this example , we're just storing on disk, but you could be storing your active storage in S3 or another object storage.
>> Rails 8.0.1 You are in good company
If we then hop into our post model, we can declare that post model has rich text body. We're gonna convert the plain text body that we had just a second ago to a rich text body that is accessible through the WYSIWYG editor, and that accepts those active storage attachments and uploads.
>> Rails 8.0.1 You are in good company
Active Storage is a way to deal with attachments and other files in your Rails application. When you run it through action_text:install, it'll automatically set up those active storage tables that we need, there is one for blob,and then we have one for text here.We run migrations to set that up again, and now that we've run action_text:install, it also added a couple of gems, so we need to restart our development server. I do that just by exiting out and just running the server again!
>> Rails 8.0.1 You are in good company
And you can help diagnose whatever issue that it is that you have ! But let's remove that again and then let's look at the console from another angle. Now, you can get the console as I just showed you when an exception raised, but you can also get the console if you just run rails console.
>> Rails 8.0.1 You are in good company
console instance variables:
Now, let me show you one of the first feature here. If we do raise exception inside the index action, "rails 'some exception' " you will see that Rails provides some really nice interface for dealing with that exception, seeing exactly where it happened. If I'm reloading here, you can see the line, it was raised on the source code that's around it, you can see a full trace. And down here, we even have a console! So, you can interact with the instance variables that have been set for this index actions, here's just at posts that's been made available.
>> Rails 8.0.1 You are in good company
Now , Rails has a bunch of different ways you can do the CSS, there's also a path where you can use Tailwind. Lots of people like that for good reason, and there are a bunch of different options, all the major CSS frameworks are available, but by default, we ship with a no build, as I said, intention and simple CSS just make things look prettier without having to adorn anything with classes, or what have you.
>> Rails 8.0.1 You are in good company
compile:
By default, I like to use simple CSS. https://cdn.simplecss.org/simple.css. It is simply a individual file that's being included, I don't have to compile anything here, I'm just referencing it straight off their CDN. And if we save that and reload, you can see it just looks a little nicer.
>> Rails 8.0.1 You are in good company
variant:
But oh yeah! Let's show you real quick here,if you do a /post.json, you're gonna get that automatic API as well, as I showed you in the controller, there are two different paths, you have HTML, and you have JSON. You could also have added XML in there or another path, but by default, you just get these two different variants, the HTML and the JSON variant.
>> Rails 8.0.1 You are in good company
This is the thing you're gonna see, when you start up a new Rails application, it'll tell you which version you're on, both for the ruby version, the Rails version, and the Rack version. That's running on localhost:3000 by default. But if we do slash posts here, you'll see the scaffold interface that we generated. Now, this is the index action, the one we just looked at in the view and from the controller. But if we click the New, you see here we have form for creating the new post with its title and its body. it's quiet basic, to put it mildly right now, but all the actions are mapped out. This scaffold interface is not meant for shipping into production, it is meant to showing you how to build a Rails application with the basics, and then you make it look pretty, you make it look nice.
>> Rails 8.0.1 You are in good company
auxiliary police:
Now if we hop over and start up our development server, you do that with just bin/dev. If we were running a Rails application that also had auxiliary watcher processes such as one for ES build or for Tailwind, bin/dev would start those as well. But this version of our Rails blog, is just going to be built with all vanilla, no build swt up so we only need to start the Puma, Ruby web server,and we can hop over into the browser and see here.
>> Rails 8.0.1 You are in good company
And as it descends from application record, we can run everything from updates and destroys and what have you. This is also where we're gonna put our specific logic that's particular to this application beyond just the management of attributes.
>> Rails 8.0.1 You are in good company
That post is just going to have a title that's string and a body that's a text, and as you can see here from what's being generated, we have everything that we need to set up a basic interface for that scaffold. There is a migration that'll set things up in the database. There is a controller, there are views, there's a model, there's even testing stubs and adjacent API on top. So let's run that migration, and as you can see here, we created the posts in the main schema file, and now, we're ready to have a look at the application that was generated here with the post scaffold.
>> Rails 8.0.1 You are in good company
Welcome to Ruby on Rails. If you are looking to go from Hello World to IPO, you've come to just the right place. I'm gonna build a simple application that shows you the basic of Ruby on Rails and how you put it into production. Let's go.
>> Rails 8.0.1 You are in good company
They have to do that , it's part of their life. If you mess that up you know. It makes everything else particularly hard. So and I heard a great speech from a woman once, who said you can have it all, you just can have it all at the same time.
>> work hard but work smart
distractions television internet. all of these things that get in the way of you actually sitting down and doing the work and more you're able to use just a little bit of willpower to remove the distractions that are keeping you from practicing. the more likely you are to actually sit down and practice .
>> 20 hours and 4 steps to rapid skill acquisition
Find 3 to 5 resources(books or DVD...). Learn just enough that you can actually practice and self correct or self edit as you practice , so the learning becomes a way of getting better at noticing when you're making a mistake and doing something a little different .
>> 20 hours and 4 steps to rapid skill acquisition
You've just learned a big lesson.
>> Social Language