Python for Entrepreneurs Transcripts
Chapter: Build web apps with Pyramid: Part 1
Lecture: Building Block: Views
0:01 Let's look at the views we get when we create a brand new app from the scaffold in Pyramid.
0:05 Now, this is not a very realistic one but it lets us point out the key elements
0:09 and we'll look at a more realistic one afterwards.
0:11 It all starts by importing the view_config decorator from pyramid.view
0:16 and here we can specify the route name as well as the template
0:19 that will be rendered from this view.
0:22 Next, we define a method, the method name doesn't have to correspond anything
0:26 in the view configuration or anything like this,
0:29 it just happens to be some kind of method that takes a request object,
0:33 it doesn't have to do anything with it but it does need to have the right structure
0:36 that is going to do some sort of processing,
0:38 here we just create a dictionary and pass some static data
0:41 so, we are going to create a model as a dictionary, this one has a project key in it,
0:46 we are going to pass it to mytemplate.pt,
0:48 this is a Chameleon template and somewhere it presumably is working
0:51 with the value of project so it will display web app somewhere.
0:56 Like I said, that previous view, not so realistic.
0:58 Let's look at maybe something more realistic here, so what this method is,
1:02 this is going to be a "reset your password" method
1:06 and note we've given it the route_name of reset_post,
1:10 you can see on the next line it's only accepting form posts.
1:13 If you do a straight request against this URL, it'll just say "I can't find this for you",
1:18 but if you do an HTTP post against it,
1:20 it will say I am actually in the process of resetting my password,
1:23 here is the form data, well it will be happy to process it.
1:26 Notice it also has a template
1:28 and the template name corresponds to the template method,
1:31 this is not required like I said but for sanity sake, I would recommend it.
1:36 So what does it look like to handle this request?
1:38 Well, it begins with going to our request it has a POST and a get dictionary
1:44 and we are going to go to the POST dictionary
1:46 and get the email that was submitted in the form.
1:49 next, we are going to go to our data layer and create a password reset request,
1:53 we'll pass over the email and presumably in here
1:55 we'll also check in if the email is empty, or doesn't exist
1:58 or it's just going to return an error and say "we cannot reset your password",
2:01 Notice the reset_password.pt view will be used to show the error
2:05 and presumably that's the same as the get version that they filled out the form to say
2:10 I need to reset my password and here is my email.
2:12 If everything goes OK, we'll do something like
2:14 send them an email saying "here is the link"
2:17 and then finally we'll send them back a message that says
2:20 "check your email for the reset code."
2:22 This is what a realistic view looks like in Pyramid
2:25 and you will write probably hundreds of them, building your application.