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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 provides a detailed overview of how Rails manages posts through its views, routes, controllers, and partials—explaining the dynamic rendering of Ruby code and setting the stage for adding user authentication.
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Now the next main thing that we
have on the agenda is to create
0:00
an ad user authentication.
0:02
But before we do that, I just want to
talk a little bit about the posts and
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how it all works, because I think I need
to give you a good understanding if you
0:07
haven't got one already.
0:11
If you have got one,
this would be a good refresher.
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So it's gonna be pretty basic.
0:14
So if we go to App, Views, Posts, Index,
index.html.erb, this is the main page.
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This is this page right here.
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You know like HTML, this is that page, but
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it has Ruby code in it
because it's a .html.erb.
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Now the reason that we're on this
page when we start up the server and
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we go to the URL, like even when we go
to this page, that's still this page.
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Slash posts on this page and
the root URL is the same thing.
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So the reason that we go to this
page when we start up server and
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we go to the application is
because if we go to routes and
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I do Ctrl+P to go to Routes or
you can just go to Config and
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then routes.rb and
that's because we said root post#index.
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Now this is extremely important.
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This is the fundamental
way of how Rails works.
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So root post#index means,
means go to the views post index and
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render that one as the root file.
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Something else that's
a little bit unrelated
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is that post controller index
is linked to this index file.
1:07
So that means that any variable
that we have in the index method,
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it's called,
is linked to this index file here.
1:16
Now the post controller, all of these
methods, they're usually not all the time,
1:20
but they usually are by default
their own separate pages.
1:24
So for example, in new there's a new
page if we go to post controller and
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then there's show,
there's also a show page.
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I just want you to know that
these methods and these pages,
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these different files are linked, okay?
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So when we go to new and let's say we want
to add a variable in let's say we want
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a variable,
then we'd like pass it into new and
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then that's how that would work and
we display on this page.
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So I just want you to understand also
something else is that when we go to
1:47
new post it's on on the index, right?
1:52
If we go back run the index,
we click New post.
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So that's this link to right here.
1:57
So link to and then the text and
the new post path.
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I'll teach you something
else now in a second.
2:02
But let's say we go to new post and
then as you can see,
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there's a form rendered here.
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Now if we go to new,
it says render form, post @post.
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Now where actually is this form?
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What actually is it?
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Well, this is called a partial.
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And a partial is essentially
a small amount of code,
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a bundle that you can
just have somewhere else.
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And it's actually in this post folder and
that's why it just says form.
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As you can see, it says _form.html.erb.
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And in here we have all the actual code,
it says form.textarea :title, form.label,
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all that good stuff.
2:30
So this is where the form actually is.
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This is an actual page that we can go to,
right?
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We're on this page right now and
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it renders this other bit
of code onto the page.
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Now when we actually go to create a post,
so I'll just say this is the first
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post and we create the post,
it goes to the show page, right?
2:43
And inside of the show page we have
another partial, it says render @post.
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I'm just giving you an overview
of how this actually works.
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So render @post, again,
this is the same thing as before.
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Same thing as the form,
it's called a partial.
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And if we go to _post.html.erb,
this is where the post code actually is.
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So if I wanted to change this title to be
in bold, I would wrap it in strong, so
3:05
might actually put it in there.
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And as you can see now it's bold, right?
3:12
Because this is essentially just this line
of text because that's the whole post.
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But if there was more like if we
had a user ID or a description,
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then that would be there too.
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Now something else that's also quite
important, if I just bump this up so
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you can see these Ruby signs,
this is a Ruby sign, right?
3:27
So it goes less than bracket and
then percentage sign and
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then percentage sign and
then greater than bracket.
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Now if you want to render
something onto the page, or
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if you want to show it onto the page,
then you have to have an equal sign, okay?
3:38
So you have to have an equal sign
after the first percentage sign.
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So make sure to understand this because
that means that it's Ruby code.
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And if you have an equal sign,
that means that it's shown on the page.
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If you don't have an equal sign, then that
means that it's not shown on the page.
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And if you have a hashtag,
then that means that it's a comment.
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So, yeah, that's a brief overview
of how this whole thing works.
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And this is really important, you have to
understand all of this, mainly because if
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you want to actually style anything and
make it look a little bit better,
4:03
then you need to understand
where things are, right?
4:07
So if we wanted to change the button
on this button right here, this post,
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we wanna change the color,
then we'd have to go to the index, and
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right here, this is the link.
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We'd have style, and this syntax,
we'd have comma, style, and then colon.
4:18
And then we just change the color and
we could say, color gold should work.
4:24
And now you can see it's gold, right?
4:29
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