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Hello and welcome.

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In this picture we are going to add some validation to our form and we are going to add that in to our

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post model.

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So let's expand our Dairy Queen here and go to apps on lalley Apps.

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Those models are a cream.

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Inside there is a Post dot R B.

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So this is what the model looks like under my meds.

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Fairly basic.

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There isn't much to defile.

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Let's just explain a few things here.

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Post class.

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You can see here in inherits it's from the Application Record the Application Record inherits from the

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active record base.

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So this is the active record base and that's the application recaught.

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So this is a post model and this is application.

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Record and the Application Record in here is from this here.

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While the post clasp inherits from that.

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Let's take a quick look.

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The application recaught saw this active record base here.

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And what that does it actually supplies a great deal of functionality to your real models.

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It does this for free.

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It includes things like allows you to do kuroda operation so you can do create.

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You can read an obsolete.

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You can delete or destroy.

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He allows you to perform all those operations you also assist with forn validation as well.

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So let's go back into the post model here.

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Rails includes methods that helps you validate the data that you send to your models.

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We just don't want to send any type of data to the model.

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We want to validate what we are able to send to the models.

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So inside here we are going to apply or implement some validation here too so that it enforces what

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you are not allowed to post.

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So to implement the validation or you need to do is typing validate.

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So we're just trying to specify what the form should validate it also validates and then do as face

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call on we want that title.

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Okay.

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Comma and then presses means we want the process off a title and we set that value to be true.

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So do a space and do True.

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Next thing we want to do we want to specify the length of that okay so we're typing Len.

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K and we do a call on.

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I'm going to specify the minimum length of character that is going to be allowed for the title.

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So you can specify any and so you type p.m. on.

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Then a call on space and they you determine what the minimum character should be in my is I'm just going

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to see for I'm happy for.

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But you put whatever value you want to what that means when you enter a title for the post.

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It has to be a minimum of four character.

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That's basically what that EDITION.

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I'm not going to go file an UNDO save all you can validate a variety of things at the moment we've Wallace

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set the validation to the title so that he does set a minimum of four character long saw you can also

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validate things like the presents or the uniqueness of column the format of the column the existence

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of arsaell see it at objects ansorge.

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So there's lots of things that you can specify where the validation for.

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Now we're just going to keep it simple and just validate the title for now with the validation line

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place that we have to go back to our post controller and we have to call the Post dot sleeve so that

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when the when you press the same button on the form it all validates the.

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Cool back to our Controller we can control click Post.

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We want to go in to this say actions fellas quote With this save action here.

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Here we are going to add in an IF statement there.

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So implement your statement first and then I will explain why.

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Same thing if.

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The post was posted save what it is say it will return in force and if you redirect it.

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You can redirect it to the post.

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So what this is saying was just submit the form.

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Once the validation is so key if the validation is OK it will redirect to the show view.

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But if every time you implement an if statement is always good to add an else for the other condition.

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So this is if the validation is OK.

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This is what it will do.

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However the validation is not to say we want to implement something else.

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If the validation is not talk we want to render a new king and then we press end to end that.

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So what I want to do is wrap this eve steadman Rapid round it and see

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wrap that there and wrap that.

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So what should happen when the few press the see Button.

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It will check if everything is validated okay.

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It will redirect to the post for you.

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OK if nothing happens that is a sure view.

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And if that's not the case everything here doesn't go OK it will fall onto this L statement and render

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the form again so render the form you give you the new form again to try again.

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So let's save that and have a look at the form hopefully out for mr who run in.

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K. So now let's try and say that if we saved that we should get some validation warning if you notice

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this.

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No.

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No error messages here.

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He just returns back to the form.

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So we need to add SOM or k..

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We've course on error here.

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Let's see was same is same with the more.

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Okay.

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Got an error here so I need to go back to the model and check that out.

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So I think the the error here I should have had a comma there.

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So let's put a comma there and safe.

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Because it doesn't await any US wives complaining.

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Let's go back and refresh hatch.

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Hopefully she'd be all right now.

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Okay.

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Yeah.

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So now let's try and see.

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This portrait kit at the moment.

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We try and save it it returns us to it gives us the form the new form is gabry renders the form.

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So what I want to do in the next lecturer is try to implement som error or handling.

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So we know what's actually happening.

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So if you SOB if you save the pause he'll tell you there's any error messages at the moment is just

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re rendering the form which is what I've specified here.

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So that's what is in here.

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If posed.

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If you press that he redirect you to depose show or else he renders a new form read.

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Does the former.

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Which is what he's doing.

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So we need to implement error or handling in the next lecture.

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So thanks for watching.

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Bye for now.