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Add complex validated

Hey, how are you? In this video i will be using a FormRequest to add complex conditional validation rules or to update or change the validation rules depending on the submitted form fields. First I will start with some bootstrapping, so if you want to jump straight to the solution please check the video description for the correct time. Right here I have a brand new installation of Laravel and behind the scenes I just used the Artisan command to scaffold the authentication. And I did this because I want to take advantage of the controllers and the forms inside the template to submit some form data. So we're going to use this HomeController for our demo purposes and instead of loading the home template I want to display the register template and I want to disable the authentication middleware, because we won't be logging in. So when I go to a browser and I open this home route we get this registration form. Wow when I open the template first I want to do some cleaning up. So we don't need any emails and we don't need a password, so I will remove these fields and I will duplicate the name fields a couple of times. The scenario that we will be imagining is that this is an e-commerce application and when you register you have the option to register as an affiliate and when you register as an affiliate the bank account field becomes required. Otherwise if you register as a customer you don't have to fill the bank account field. So I will go to the first field that we duplicated and I'm going to rename this to "Are you an affiliate?" and all the mentions of name I'm going to rename to are_you_affiliate with underscores. And of course this one needs to remain as the name attribute. So next the other field, this will be our "Bank account". And again all dimensions i will call them "bank_account" with underscore and again fix the name attribute. So now when I go to the browser and refresh we get Name, Are you an affiliate? and Bank account. Now this form should not submit to the register route because we want it to go to our controller. So I will call this route "home.store" and inside the controller I will make this method called "store()" and here for now we'll just "die()" with "all good". Now in order for this to work I need to make the route I called it "home.store" and we want this to submit to the "store()" method and this needs to be "post". Now when I refresh I'm going to fill this and submit the form and get "all good" as expected. Now let's get started on the FormRequest. I'm going to open the console and create a new request class. So "php artisan make:request" and we are going to call this HomeRequest. Now inside the controller we want this method to be validated with this HomeRequest. And here we want to be authorized all times and for the rules we're going to start with "name" which is going to be required. Next, "are_you_affiliate" and this is going to be required as well. So now when I refresh the page I will enter a value for name and when I submit we only get an error for our "Are you an affiliate?" field, because we left it empty. Now what we want to do is add validation for our bank account field and this will depend on the value that we submit on our "are_you_affiliate" field. So what we want to do is have the "bank_account" required but only when you're in affiliate. So to do this we need to get the value of "Are you an affiliate?" So first i'm going to make a variable called rules and i'm going to set it to the rules array and I'm going to return the rules at the end of the method as expected. And now for the part where we get the affiliate value we can call "this->get()", which will get any value from the request and we want to get "are_you_affiliate". And we want to check this against any value or any condition that you might think of. In this case I'm going to compare this to "I am". So if our field "are_you_affiliate" has a value of "I am", then we will assume that this person wants to be an affiliate. And now to check this variable, so inside this bracket the condition will let us know that this person wants to be an affiliate. So I need to add to the rules our bank account validation. Okay let's give it a try. First I will refresh. I have a "Name", "Are you an affiliate?" - "I am not" and I submit, we're all good. I have a "Name", "Are you an affiliate?" - "I am" and I will skip the bank account. I will submit the form and you see our validation works as expected. Now if I provide a value for the bank account and submit the form, you see that we're all good. This is one way to solve this problem and add or update any of the validation rules, on some type of condition. The next way I'm going to show you is with a method called "withValidator()". And this method has a parameter "validator". And if you haven't seen this inside the documentation, this method is called from the parent, the FormRequest. So if you open the FormRequest and we search for "withValidator" you can see that this method is called when the validator instance is created. So right here we have access to the validator and we will be adding a "sometimes" rule. This rule is a dynamic and depends on a boolean value which is returned from a callback. So sometimes you might want to run this validation and sometimes you might not. Now we want to validate "bank_account" field, our rules will be only required and this is our callback which will return the boolean if we want to validate or not, and this will have a parameter of input. Now like I said we need to return a boolean here. So it's pretty much the same like we did a minute ago, if the person is an affiliate we want to validate the bank account, and I have to spell bank correctly. And this variable "input" gives us the same functionality that we used before. And here we can get the value of "are_you_affiliate". Okay now let's give it a try. First I have a "Name", "Are you an affiliate?" - "I am not". I submit, it all good. Now "Are you an affiliate?" - "I am", I don't have a bank account. And this tells me that the bank account is required. Now I will add a bank account submit again and we're all good. So this is all for this video. I hope that this was useful for you and have in mind that this way you can also get binded route parameters and use their properties for adding more complex validation rules. So if this is something you want to see in another video, please drop a comment below and let me know. Also if you have any questions please leave a comment and I'll try to answer them as soon as I can. Thank you for watching!