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Welcome back, everyone, to this lecture, which is going to discuss the update view, which allows

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us to update an already existing entry inside our models, similar to create view, except for something

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that already exists.

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Let's get started.

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All right.

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Here I am back inside views about pie.

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One thing to note when we talk about update view is it's kind of a mix between a detailed view and a

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create view.

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It's kind of like a create view because you will be filling out a form to up the information.

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But it's also kind of like a detail view because when you're talking about updating, you're talking

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about a specific entry with a unique primary key.

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So you can think of an update view as a create view that already pre filled out the form based off a

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detailed view.

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Let's see how it works.

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I'm going to import update view from Generic, and then let's create our new update view.

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So we'll say the following class.

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Teacher up, the view, we inherit the up the view and then we say model is equal to teacher, so we

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connect it to a model and then technically there may only be a few fields you want to update.

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However, you should note the following is that Teacher Update View is actually going to share the model

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form HTML template that create View also uses, and it looks a lot like create view as far as attributes

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are concerned.

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Now, let's take a moment and think, does this actually make sense?

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Should it make sense that the creation view uses the same form as the update view?

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In my opinion, it's yes, that does make sense, because if you're creating a new instance of a teacher,

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you should have all those fields available for you when you want to update a teacher.

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Now, maybe you want to limit the fields upon updating.

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You can technically do that.

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You could say fields and your update view is equal to and then pass a list.

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For example, maybe you're not going to, for whatever reason, allow people to update their first name

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or the subject they teach.

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But maybe you want to be able to update last names in case somebody gets married and changes their last

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name.

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What you could do is have an update view that only shows the last name on the form, and you could just

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pass on a list of the fields and the names you want to update.

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And remember these names here.

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Those are just from the model, so I connected it to Model Teacher.

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I go to models and I see, OK, I could update their first name, last name, subject, or if you just

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want to be able to update all of them, you would come back to views and just like we did for create

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view.

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You would just as a string pass, an underscore underscore all that says allow all the fields to show

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up in the form that's automatically filled out and created for update view.

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And then lastly, similar to our creation view, remember, upon clicking submit for the update, we

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have to take them to a particular page so we could use the same idea of success.

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URL reverse lazy to do that here.

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An update view.

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OK, so we say success early, except maybe we take them to the list teachervue, because that would

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make more sense to actually view the changes.

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So this way we'll update you does is it's actually going to open up the.

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Teacher form and then display the form that you sent back, obviously, as I mentioned, you technically

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have flexibility over what fields show up an update versus what fields show up and create, and in certain

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situations, that actually makes a lot of sense.

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Do you have limitations on what can be updated versus limitations on what can be created?

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Maybe there are some sort of date time stamp for creation that you don't want someone to be able to

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kind of go back in time and then say, actually update the time stamp here?

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Maybe only one admin user to do that from a super user standpoint.

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Again, it really depends on the situation, but I do want you to kind of think about those cases where

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in this particular case, we're saying you can update any field you want first name, last name or subject

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that's being taught.

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Maybe in your particular situation, you actually only want to update a few fields.

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And in this case, you define the success URL again, notice just how similar this looks to create view.

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Now, it's not exactly like create view, because remember when we're updating something, we're only

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updating again a single primary key, which means that you URLs is actually going to look a lot more

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similar to something like a detailed view.

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Let's check that out.

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I'm going to go to my URLs that pie and then let's import our teacher update view.

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And let's create a new pathway here.

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We're going to see path is equal to.

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And we're going to call this update teacher forward slash.

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And this is where the primary key is going to go into your primary key.

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And then we just say teacher update view as a view.

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And if you want, you can give this a name as well, like update teacher.

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OK, save that change.

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And so now it's going to happen, is it going to have the capability to update a teacher?

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Now we're should actually link this again.

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It kind of depends on what you want to do.

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You could if you wanted to create a new template that says, Hey, fill me out for a form to link you

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to an update where they just fill out a form, maybe pass in one, two, three four, etc. That's a

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primary key and a link to update a teacher.

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You can't again really have a generic update teacher link that doesn't really make sense, because remember,

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you need a specific primary key.

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So maybe a good candidate for that particular link would be similar to where we passed in the teacher

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list.

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I could say maybe a link here for updating.

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So let's create yet another anchor tag, and I'm going to put this all within the same list item.

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So we're going to say teacher, first name, last name and then.

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This is the list item, but I'm going to create yet another anchor tag here, and it's going to go to

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classroom.

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Update teacher.

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And then it's going to give the teacher ID.

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Very similar to a detail to you, except now we're linking them to that update page.

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And then here I can just put some text to say update information.

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Obviously, you can get a lot more fancy if this maybe this is a button or something like that, but

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it's going to save that.

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OK, so let's see what our list looks like now.

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So I come back to our list.

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I refresh this and now we have Adam Smith and then it says update information.

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Now I see up the information three times here.

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Maybe that's not super clear.

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So what I can do is come back here and I also accidentally delete a space there.

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And so I can stay up the information for.

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And then maybe I say teacher first name.

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Something like that again, this is just a team of formatting on what you want to do here.

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It's not so much jingo.

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So I refresh this and maybe this looks a little nicer.

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Arrowsmith Smith up the information for Adam.

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Maybe I actually have that as an indented list item, so you could keep kind of messing around with

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this to get the best kind of look you're going for.

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So I can make this yet another.

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Unordered list here and then stick that in as its own list item, so I could copy that passenger list.

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Puts that in.

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And then let's make sure our tags are close correctly, so this one would go this closing tag.

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Would go here.

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There we go.

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And there we have it.

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OK.

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Let's see if I hopefully that it must add up.

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But essentially it's trying to deal with a nested list and there real Adam Smith update information

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for Adam Jose Padilla of the information for the third teacher up the information officer.

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OK, not so bad.

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Now let's see what happens when I go to Adam Smith.

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Remember right now if I click, Adam Smith takes me to the detail view.

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Adam Smith teaches economics.

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Let's say Adam Smith went ahead and changed the topic.

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They were teaching how they want to teach math.

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I click on update information for Adam.

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And it takes me to that teacher form.

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If you look carefully at the URL for this, it says Classroom for update teacher forward slash number

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two.

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So Adam is the number two teacher.

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I ended up creating its primary keys, too.

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Then I can come here, it's economics and maybe switch it out to math that I hit submit.

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And now we have the list of teachers and the list you.

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Adam Smith Jose Padilla, third teacher If you click on the detail for Adam Smith and now says Adam

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Smith teaches math.

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So what's happening behind the scenes?

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Well, when you click on an update view for a particular primary key, it essentially just calls the

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teacher form.

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But unlike Create View, a update View says Fill it out or pre fill the information that is already

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known for this particular entry at this particular primary key.

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Then, upon hitting submit, you're going to save those changes an extremely useful view.

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Again, all we're doing here is connecting to the same form we had for create view.

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Except this time I'm pre filling it with the information for a particular primary key.

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That means the same caveats from the details you apply to the update view.

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I can only do this for a particular primary key.

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I can't just say Hey Link to the update view.

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I want to point out what I often see students do as a mistake is on the homepage.

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They'll try to make a new link here that says something like anchor tag classroom or URL.

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So I'll say something like URL.

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Classroom and then they just try to say something like detailed teacher or something like that.

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Or maybe they try to say update teacher, but this doesn't really make sense to be on the home page

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because I need a primary key.

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And if I just have this is a link, there's no information of what teacher actually want to update.

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So if you want to make a generic link like that, that would have to first take you to some sort of

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form where the client can inform you.

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I want to update user number one or user number two, user number three, etc., which is why typically

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it's kind of nicer to combine the idea of this list view with the fact that I know that it is already

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there for me, rather than have the user maybe provide accidentally the wrong idea.

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Of course, it's up to you and the website you're creating, but you get the idea.

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All right.

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Hopefully, you see now how powerful these class based views were.

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And we're going to discover one more class based view, which is the delete view.

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And it's essentially like update.

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Except this time, instead of updating, it's going to delete that particular entry.

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Let's check it out in the next lecture.