Building Data-Driven Web Apps with Flask and SQLAlchemy Transcripts
Chapter: User input and HTML forms
Lecture: Register for the site (getting started)
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Now in this next section
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what we're going to do
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is we're going to create a login form
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and a registration form
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that will let us register for the site
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and then later log into it.
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So we would have user management in our web application
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as well as these forms.
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So we're going to put these two things together
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and actually tackle them at once.
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So if we run our app, you'll see over here
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it's running right here.
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And if we try to click on register or login
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we're going to get a sub-standard experience.
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As in, error, URL was not found.
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However, we actually did put a little bit of work in here
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but what we haven't done yet, is we have not yet gone
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and imported the blueprint.
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Remember for each one of these view sections
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we got to import their blueprint
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so we're going to go and get the blueprint out of here.
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Alright so now if we refresh that
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now we just get, hooray, there's no template.
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Okay, well, it's a little bit better.
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What we need to do is go over here
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our template section and we need to create
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a new directory called account.
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Remember that's how we're organizing stuff.
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all the operations inside account views
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are working with templates in here
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and honestly, the easiest way to just create another page
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is to copy exactly what we have
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and about as, about as simple as it comes.
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So let's go and call this register
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maybe you want to login, as well.
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Now, let's just see if we got this working.
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We refresh. Alright. This is about our site
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well not really, but the registry thing is working
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so that's a good bit right here.
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So this will be Register at PyPI
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This will be our form.
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I'm actually going to use this little CSS section as well
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so this is pretty good.
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If we look over in the account view
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here the account view methods.
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We actually already put the get/post/redirect pattern
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well at least the POST and GET part in place.
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So we've got our index, that just returns.
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Here's your account, there's no data access.
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There's no data exchange at all.
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This is just, you know the skeleton pieces
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but it's here.
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So this is going to be, I want to see my home page.
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Maybe we send them here when they log in.
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Here's the login
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and we going to do a /account, /login for both these methods
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but this one, here's the important distinguishing part
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inside Flask for the get/post/redirect pattern.
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This one only responds to GET requests.
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This one only responds to POST requests.
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A lot of times what you'll see is
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people will just have like a login function
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and they'll say
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if the request, you know Flask request is GET sort of thing.
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We'll do something else, we're going to do something else.
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This is so bad folks.
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It's really, really not good
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to like have these branching statements
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and these functions doing two things.
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So we can just use this little methods
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but here to determine which function gets run
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and when you're doing this make sure
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that this one is called _get
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and this one's called _post.
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They don't have to match the HTTP verbs
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but what they do have to do is be distinct.
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You can't have both two login functions
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that will be a RuntimeError inside Flask.
