Building Data-Driven Web Apps with Pyramid and SQLAlchemy Transcripts
Chapter: Routing and URLs
Lecture: Getting data from route
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Now, this is not going to work.
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If I come over and refresh it, it's going to say
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well now you say there's a package name
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and there's not.
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Let's fix that last thing.
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So the question is now
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how do I get that package name?
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Remember, it's passed into request
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which we now need to use this, so put its name back.
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And then we want to get the name out.
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So here's a quick simple one.
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Package, name, it's going to be request.matchdict
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notice no autocomplete, watch this.
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Go over here and say request.
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So, if we import this, if we say from pyramid
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request, import, request
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and now come down here and say dot
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we get all sorts of stuff, including
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matchdict, which is a dictionary.
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And in this, this where it's been passed
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in the URL, has that variable.
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So we do a get on it.
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Then we'll just come down here and say
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package name, whoops, this needs to be in quotes.
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Let's re-run it, and see how we're doing.
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There's requests, what if we
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go for sqlalchemy?
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There, sqlalchemy, and so on.
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Notice how the routing is passing it along.
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Here are the details for pyramid
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of course we don't actually have that data
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but we can get the structure in here
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and then we'll just create hyperlinks
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out of the database, or out of our fake data
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either one, that point back to something like this.
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Okay, so this route is working really well.
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We've a few more we want to add
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let me do a little clean up here.
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Also, you'll notice that this
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we're not testing this here so it could be
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this comes back as None because for some reason
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it didn't get passed or, more realistically we
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went to the database and they did a query for
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a thing that didn't exist in our database.
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So we can say, if not package name
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then we can do, raise
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say import pyramid
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httpexceptions as x.
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I'm going to go x.HTTPNotFound.
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That'll I'll just tell whoever's listening
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it wasn't found.
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Let's suppose, just test this really quick.
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If we go ask for gone, let's see what we get.
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So here we can ask for pyramid, everything's great
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but if I go and say gone, boom, not found.
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So that little bit isn't working.
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Of course this doesn't make sense.
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But if we don't get past package name or we try
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to do a query and it doesn't exist
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then we're going to tell them it's not here
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otherwise, it will return the details of it like this.
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We're going to get much more advanced when we get
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to the database section, but this interaction
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with the routing is pretty typical.
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So, a request comes in, it has matchdict the
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values passed in the route like so
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appear in here and we interact with it however we want.
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We get the value back, maybe we talk to the database
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call a web service, whatever.
