We've seen two different ways to validate a single field. 0:00 We can do it with clean field or 0:03 with a validator, either one that Jango provides, or one that we write ourselves. 0:06 All of these methods, though, only let us handle a single field at a time. 0:10 What if we need to check two or 0:14 more fields together to know if the one was valid? 0:16 This is where the form's clean method comes into play. 0:19 Let's go to workspaces. 0:22 All right, so our suggestion form is good. 0:24 One thing we probably wanna add, just to make this a more complete form 0:26 is we want somebody to verify their email address. 0:31 Let's go over here, let's get rid of this inspector. 0:33 We don't need that anymore. 0:36 So we want them to verify their e-mail address, and 0:38 let's do that by adding in another field. 0:40 So we'll say verify_email = forms.EmailField, and for 0:43 the help_text, let's put in, "Please verify your email address". 0:48 And now let's see what this does to our view, or form. 0:56 So we have our name like normal, we have email, and we have verify email, and 1:02 below that it says, Please verify your email address. 1:06 We can do that as a label instead of as the help text if we wanted. 1:09 We could be wanting to change this right here over to label, 1:12 and then Refresh, there we go, 1:17 and that's maybe a little more clean, and what you'd expect either way it works, 1:22 the help text is really handy when you're making forms for the admin. 1:29 And now though, we need to make sure that if put in my name here, 1:33 and I put in kenneth.example.com here, but I put in kennethlove@example.com here, 1:39 it should throw an error, and go, hey, you didn't give me the same email address. 1:49 So how do we do that? 1:54 We do that by specifying a clean method for the entire form. 1:56 So notice this clean method is just called clean. 2:02 There's no field name after it. 2:04 So this will clean the entire form. 2:07 So everybody go through every field and 2:09 make sure the field satisfies its own requirements. 2:10 Then we can go through the entire form as a whole and 2:14 make sure the form satisfies its requirements. 2:16 So, we need to get a couple of things in here. 2:20 So first of all let's get all of the data. 2:22 And we're gonna call super.clean. 2:27 That calls the clean method on our forms.form, or on our suggestion form. 2:29 So, that gets all of our cleaned data, it give us all of our data back. 2:36 So then we'll do email = cleaned_data. 2:40 And you can either do email or you could do, .get( 'email' 2:45 ) it acts like a dictionary, so, you can do either one of these. 2:51 And and then we'll do verify, cleaned_data.get( 'verify_email' ). 2:57 And so now, what we wanna do is we wanna make sure that the two of 3:04 those have the same data and are both filled in. 3:07 We already know they're both gonna be filled in, because it's gonna come back. 3:11 So we can just do, if email does not equal verify. 3:14 So if they don't have the same data in them, 3:19 then we want to raise forms.ValidationError. 3:22 And our error, we're gonna put in here, we'll just say, 3:26 "You need to enter the same email in both fields". 3:31 All right, so that's it. 3:37 Now we don't have to return anything from clean. 3:38 Unlike clean field, 3:41 like clean honeypot, you don't have to return anything back from clean. 3:42 It's cool with just running through and if there's no errors then it's happy. 3:46 So, this is bad. 3:49 Let's go ahead and suggest that and we'll say, Data security! 3:51 Oops, there we go. 3:57 That's the thing I want somebody to cover. 3:58 And if we hit that we get you need to enter the same email in both fields. 4:01 So great we got an error message about our two fields. 4:05 The fields are both, one of them is wrong. 4:08 We don't know which one. 4:11 So they both need to match. 4:12 Between cleaning fields, validators, and cleaning whole forms, 4:14 we're definitely able to make sure that our data is exactly what we want and need. 4:18 Okay, let's leave forms alone for a little bit and 4:23 go make some more interesting models for our next feature. 4:26