Building data-driven web apps with Pyramid and SQLAlchemy Transcripts
Chapter: Routing and URLs
Lecture: Getting data from route
Login or
purchase this course
to watch this video and the rest of the course contents.
0:00
Now, this is not going to work.
0:03
If I come over and refresh it, it's going to say
0:06
well now you say there's a package name
0:08
and there's not.
0:09
Let's fix that last thing.
0:11
So the question is now
0:12
how do I get that package name?
0:15
Remember, it's passed into request
0:17
which we now need to use this, so put its name back.
0:21
And then we want to get the name out.
0:23
So here's a quick simple one.
0:26
Package, name, it's going to be request.matchdict
0:30
notice no autocomplete, watch this.
0:33
Go over here and say request.
0:37
So, if we import this, if we say from pyramid
0:43
request, import, request
0:46
and now come down here and say dot
0:48
we get all sorts of stuff, including
0:51
matchdict, which is a dictionary.
0:54
And in this, this where it's been passed
0:56
in the URL, has that variable.
0:58
So we do a get on it.
1:01
Then we'll just come down here and say
1:03
package name, whoops, this needs to be in quotes.
1:08
Let's re-run it, and see how we're doing.
1:12
There's requests, what if we
1:14
go for sqlalchemy?
1:17
There, sqlalchemy, and so on.
1:19
Notice how the routing is passing it along.
1:23
Here are the details for pyramid
1:25
of course we don't actually have that data
1:27
but we can get the structure in here
1:29
and then we'll just create hyperlinks
1:30
out of the database, or out of our fake data
1:32
either one, that point back to something like this.
1:35
Okay, so this route is working really well.
1:38
We've a few more we want to add
1:40
let me do a little clean up here.
1:42
Also, you'll notice that this
1:46
we're not testing this here so it could be
1:50
this comes back as None because for some reason
1:53
it didn't get passed or, more realistically we
1:55
went to the database and they did a query for
1:57
a thing that didn't exist in our database.
2:00
So we can say, if not package name
2:02
then we can do, raise
2:06
say import pyramid
2:10
httpexceptions as x.
2:15
I'm going to go x.HTTPNotFound.
2:20
That'll I'll just tell whoever's listening
2:23
it wasn't found.
2:26
Let's suppose, just test this really quick.
2:30
If we go ask for gone, let's see what we get.
2:34
So here we can ask for pyramid, everything's great
2:36
but if I go and say gone, boom, not found.
2:40
So that little bit isn't working.
2:43
Of course this doesn't make sense.
2:45
But if we don't get past package name or we try
2:47
to do a query and it doesn't exist
2:49
then we're going to tell them it's not here
2:50
otherwise, it will return the details of it like this.
2:53
We're going to get much more advanced when we get
2:54
to the database section, but this interaction
2:57
with the routing is pretty typical.
2:59
So, a request comes in, it has matchdict the
3:03
values passed in the route like so
3:05
appear in here and we interact with it however we want.
3:10
We get the value back, maybe we talk to the database
3:12
call a web service, whatever.
