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You have completed Rails 8 Course - Beginner to Intermediate!
You have completed Rails 8 Course - Beginner to Intermediate!
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This video covers how to create a new page in a Rails application, set up routing, configure controllers and views, and establish navigation links between pages.
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[MUSIC]
0:00
Now, we can take this one step further,
and
0:04
I want to give you a better understanding
by creating a new page on the application.
0:06
The application is gonna
have a page called homepage.
0:09
So let's go ahead and do that.
0:11
We're gonna go to the terminal, right?
0:13
So go to the terminal, hit clear.
0:15
And inside of here, what we're gonna do
is we're gonna say, rails g controller,
0:16
we will call it pages, and we'll just
have one page called home for now.
0:21
You could also add like an about page,
contact page, pricing page, whatever.
0:25
So I'm just doing this for the purpose of
showing you, hit Enter on that command,
0:29
and that's going to create a new
controller, a new folder, and a root.
0:33
So look, if we go to post controller,
I mean, pages_controller,
0:36
this is a new controller.
0:39
And then as you can see in the views,
it created a pages folder.
0:40
And as you can see in the routes,
it created a get ''pages/home''.
0:43
So this is the root that we need.
0:47
Now that we have our new page in the code,
0:49
we want to actually go
to it in the browser.
0:51
So how do we do that?
0:53
Well, let's first of all run rails s.
0:54
Because if we didn't run rails s, we'd get
this error, I'm not sure if you noticed.
0:57
If we didn't run rails s,
we wouldn't be able to connect.
1:01
So we need to run rails s.
1:03
So run rails s.
1:05
And then,
how do we actually go to this page?
1:06
Well, if we go to pages/home,
it should actually work.
1:08
And I did pages.home,
pages/home does actually work.
1:12
That's pretty cool.
1:16
We now have a new page on our
application and we can go there.
1:16
But what if we want to change the URL
of this page to be the homepage, right?
1:19
Then what we could do is
we could go to routes.rb.
1:23
So if I just show you where it is, again,
routes is in config and routes.rb.
1:26
Or you can do Ctrl+P, search for
it, and it's in routes.rb.
1:31
Then inside of here all we
have to do is say root, and
1:34
we can change this to pages#home.
1:38
Now, the reason that that
works is because it goes and
1:40
finds the controller that has the name of
pages and then it goes to the home method.
1:43
So, I'll say that once again, it finds
the controller that has the name pages and
1:48
it goes to the whole method.
1:52
This is extremely important.
1:53
So anytime you see a hashtag,
1:54
the word after the hashtag is
the name of the method it's going to.
1:56
If we look at this, get 'pages/home',
that's something different.
1:59
It's going to the view.
2:02
Go to app>controllers>pages_controller.
2:03
As you can see,
this is called the pages_controller, and
2:05
it has a method called home.
2:08
So that's why this all works.
2:09
It's all interconnected.
2:11
And so, now if we save that routes.rb
file, I just go back to it.
2:12
I think I forgot to save.
2:16
Then root of the application
should actually be this page.
2:17
As you can see, it is.
2:20
So now if we want to change this page,
all we have to do is just go to
2:22
views>pages>home, and
then we just change this, all this HTML.
2:26
We can say, this is the home of the app.
2:31
As you can see,
this is the home of the app.
2:38
We can just add a full stop and,
yeah, so that's how this works.
2:40
Now, one thing that I do want
to show you is this command.
2:44
So it's called rails routes, and
2:46
this gives us all of
the routes in the application.
2:48
And there's so much stuff here
that you have to look at, but
2:50
the real important parts
are the following.
2:53
So look, prefix and verb, and then
the URI pattern, and over here as well.
2:55
So the controller action.
2:59
So as you can see it says,
new_post, right?
3:01
So the new_post, and it says, post#new.
3:03
So new_post goes to post#new.
3:06
So if we want to create
a link to post#new,
3:08
we want to go to create a new post,
then we would say new_post_path.
3:11
And if we go to VS Code and
then we go to the posts>index.
3:15
As you can see, it says new_post_path.
3:19
So that's how that kinda works.
3:21
So if we take another example,
if we go to the show page, and then we go,
3:23
look at this link, Edit this post,
go to edit_post_path.
3:27
And then we also take
in the variable @post.
3:31
And if we look at the roots,
edit_post, and then goes to post#edit.
3:33
So that's perfect.
3:38
And then after all of these,
after all of these prefixes,
3:38
you add an underscore path, and
that's how you get the root.
3:41
So it's kind of like
a mathematical equation.
3:44
So if we want to go to the posts>index
page from the homepage,
3:46
how would we do that?
3:49
Well, we'd have to create a link.
3:50
But what would be in the link?
3:51
Given our previous example,
can you work it out?
3:52
Well, the answer is,
it's gonna be posts_path.
3:55
So I'll show you now.
3:57
So if we go to VS Code and
then we go to pages>home,
3:58
inside of here we're
gonna create a new link.
4:00
We're gonna say link_to, we'll say Posts.
4:02
We'll just say posts_path.
4:06
That's it.
4:08
So that should create
a new link to the posts.
4:09
So as you can see, if I refresh and
I have to start the server,
4:12
forgot to start the server.
4:15
So I'll do, clear, and
run it again on rails s.
4:16
Go back to this, as you can see,
now I can go to Posts.
4:21
And now I'm on the post page.
4:24
Let's say we want to go back to
the homepage, how would we do that?
4:26
Well, we go to the posts,
so we go to the post>index.
4:28
And then inside of here,
what we do is create a new link.
4:31
Where do we want the link?
4:33
Well, you can just have
the link below this new post.
4:34
So I'm gonna copy and paste this new post.
4:38
And then inside of here we're gonna
change this to, we can change it to,
4:40
Back to home, for
now cuz we only have two pages.
4:45
And then we can say, root_path.
4:48
So here we can say root_path because
we set it as the root in config.routes.
4:53
And now if we refresh,
we should have the root to homepage.
4:59
We can go there.
5:03
And now we have some functionality in
our application using Rails, right?
5:04
Might just add a BR tag.
5:07
So that's all I wanted to show you,
5:09
now you have a brief overview of
how things actually work in Rails.
5:10
You know that these files are connected
to the controllers, you know a little bit
5:13
more about routes and how to create links,
and it's extremely important.
5:17
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