Building Data-Driven Web Apps with Flask and SQLAlchemy Transcripts
Chapter: Course conclusion
Lecture: Routes

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0:00 Once we have our view methods in place
0:01 and the templates that are going to show their html
0:04 we have to figure out how our URLs
0:06 map over to those view methods
0:08 and that's where routing comes in.
0:09 So we can simply refer to the static folder
0:13 like /static/css/site.css
0:17 and we don't have to do anything for that to be mapped.
0:19 Flask will already do that for you
0:21 but maybe we want to go to one of our view methods
0:23 and say this one is going to
0:24 respond to /
0:26 and this other one is going to respond to /about.
0:29 While these pages themselves
0:31 what's actually shown in the html
0:32 may be not be totally fixed and static
0:35 the actual route will.
0:36 We're not passing additional data
0:38 along the route.
0:39 But sometimes, you do want to
0:41 like in our package, we want to show
0:43 different packages, and that's actually part of the URL.
0:46 So we could say
0:47 we want to map /project/<package_name>
0:49 and what we put in angle brackets here
0:51 will become variables in the view method
0:54 and that will be passed along
0:55 whatever value gets put in there
0:57 automatically by Flask.
0:58 We can even have constraints.
1:00 Remember we did our popular packages there?
1:03 Is that if you do a /number, like /1, /7, whatever
1:08 we want to go and actually call this popular route.
1:12 However, if for some reason, you pass /about
1:14 it's not going to match that, right?
1:15 And that's because of the int: there in that screen.
1:20 That's it. It's also a good idea to define these
1:22 from more specific to more general
1:24 so Flask is going to hit the first one that it knows about
1:28 and just call that method, so you want to do that as well.
1:30 by the order in which you register blueprints
1:33 and things like that.