- Before and After Requests 4:27
- To the ends of the request 3 objectives
- LoginManager 4:38
- Set up LoginManager 4 objectives
- Flask-WTF Forms 9:39
- Form with Validators 4 objectives
- Registration View 6:33
- Macros 4:19
- Login View 6:17
- Form View 3 objectives
- Logout View 3:24
- Controlling sessions 2 objectives
Preview
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Macros
4:19We don't want to have to type out all of the template code required to render forms every single time we render a form. Let's make a Jinja2 macro, or a template function, that'll handle this work for us.
What I've done here is rendered out our
registration.
0:00
We're gonna be doing this a lot.
0:04
So, we probably wanna make a way to not
have to do that a lot cuz we're lazy.
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Right?
We're programmers.
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So, Jinga2 has this handy thing called
Macros and we can build Macros.
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So, let's make a macro that'll render a
field for us.
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So, new file, I'm gonna call this
macros.html and sorry,
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I gotta put it into the right folder
there.
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Okay.
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And inside macros.html, we just write our
macros as HTML.
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So, I'm gonna take this whole thing.
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And paste it in here.
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And my spacing is a little weird.
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Let's just select all of that.
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Have that back out one and
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then what we need to do is here we need to
do macro render_field.
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That is the name of our macros
render_field.
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And then we're going to pass it a field.
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And then, down here at the bottom, we're
going to endmacro.
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So we took all of our code, and let's take
it out of here.
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We don't need that anymore.
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It's in macros.
1:10
So now inside here, we want to call, or we
want to run printout.
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Render_field, and then the field that
we're on.
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And to do that, just like we have to
import functions and stuff, and
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we need to do from macros.html import
render_field.
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All right, let's see if this works.
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So we come down here.
1:35
And we do python app.py.
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We have an error on line 4.
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We forgot our comma after email.
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All right.
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And we have a problem down here.
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This should be username.
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[BLANK_AUDIO]
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Okay, so we need to put a try around this.
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And if we get back our value error, then
we'll just pass on this one.
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Because it's okay.
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The error comes out and we're like, yep.
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User's already there, that's fine.
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All right, there we go.
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So there's our app running.
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And let's preview it.
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[SOUND]
Okay.
2:28
Sorry.
We had some issues here with running this.
2:33
So I actually ran this and I kept getting
an error about the database being locked.
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If that comes up, delete your database and
restart python app.py.
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So, anyway, and now that it's running,
2:45
we're gonna go up here to our little I
icon and we're gonna click port 8000, and
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we've got hey, of course, cuz we went to
the home page.
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Let's go to register.
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And look at that.
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There is our form.
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Here's each of our fields.
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And something that we forgot, let's go add
that.
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We'll go back to our register.html.
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We need to add an input or a submit.
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So, we're actually gonna do a button.
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I go submit ID equals submit.
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And we're gonna say register.
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All right.
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And let's go refresh this.
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There's our Register button.
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And if I click that, I get the fields are
required.
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So let's do a user name that's wrong.
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And let's hit Register and I get that it's
not right, right?
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It should be numbers, letters, underscore,
etc.
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Let's do that right.
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Now let's do something that's not an email
address.
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Mm, invalid email address, okay.
3:40
So, hello@example.com.
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All right, this field's required.
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Let's just do P for my password.
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Oh, it must be at least two characters
long and passwords must match,
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because this password doesn't match that
password.
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So, you can see that our validation is
working like we're expecting.
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Now, that's great.
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Macros are one of the most useful parts of
Jinja2 which is our template engine and
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obviously, being able to show users errors
makes it a lot easier to sign up.
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If you give a user an account, they're
gonna want to sign in.
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Let's do that now.
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