Adding a CMS to Your Pyramid Web App Transcripts
Chapter: Routing for the CMS
Lecture: What is routing
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In this chapter, we're going to put one of the most fundamental elements in place for our CMS.
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The ability to capture an arbitrary number of different URL requests over to our website, determine through a database or something else
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if we want to tell the user, "Hey, there is a page here" or not. This won't depend on the structure of our website or any given files.
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It's just going to be a place to catch all the extra stuff that doesn't already get addressed and map somewhere.
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And then we can decide do we want to show them a page maybe redirect them somewhere or just tell them that "page doesn't exist".
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And the core concept for that is routing. So let's review, super quickly, what routing is.
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On the left here we have the blue web browser. This is representing the user, visiting your web site.
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On the right, we have this grey box. This is our server, and it has two Python files, which define the behaviors for packages
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and for the home, just sort of the general top level stuff. In packages you can go to 'index', which is a list of all the packages
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or you can specify given package and get its details.
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And home, you just get a '/' that goes to the index and '/about' or something like that would maybe go there. We could decide what the URL is.
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So with this set up The user is going to make a request to our server. We're going to do a get request for '/project/sqlalchemy'
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and within our Web application, we've specified many different routes.
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And what's going to happen with the server is it's going to go through and it's going to say, Does this match? Does this match? Does this match?
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So it's just going to go through its list and say, "Well, we have a route that says for '/' show 'home/index' does, '/project/sqlalchemy' match that?
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No. Well, let's see what else there is. Oh, we have this one '/about', and that's going to go to the 'home/about' behavior.
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No, that doesn't match this pattern either. Now we have another pattern that '/project/<some variable piece of data> called package.
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Does that match '/project/sqlalchemy'? Why, yes, It does. So what we're gonna do is we're gonna say the value of 'package' is 'SQLAlchemy'
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and we're going to call the view method 'packages.details' We do that. we're gonna have pyramid set up what's called a 'MatchDict', and
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in here we're gonna have the key being the variable name in the route package and the value of that key being what was passed in the URL, SQLAlchemy.
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And we're gonna take that request which is set up along with the MatchDict like this and bunch of other details.
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And we're just going to call that function. Well, Pyramid is going to call that function and pass the request object which
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has been pre-populated like this auth. An whatever that method does. it's going to do,
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You know, likely it pulls that information back from the database. It fills out some HTML and it sends that back to the user.
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This is the general idea of routing, how it works in our website, and
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we're going to see how we can fit into this world so that we can add our CMS routing to, catch arbitrary URLs and
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then just decide that those either represent virtual pages in our website or we can say they don't represent anything