validation in laravel 8 code example

Example 1: how to add an custom error to validater error in laravel

if (request('event') == null) {
    $validator->errors()->add('event', 'Please select an event');
}

Example 2: laravel validation

/**
 * Store a new blog post.
 *
 * @param  Request  $request
 * @return Response
 */
public function store(Request $request)
{
    $validatedData = $request->validate([
        'title' => 'required|unique:posts|max:255',
        'body' => 'required',
    ]);

    // The blog post is valid...
}

Example 3: laravel validation example

//import		
		use Illuminate\Support\Facades\Validator;
	
		// single var check
        $validator = Validator::make(['data' => $value],
            ['data' => 'string|min:1|max:10']
        );
        if ($validator->fails()) {
            // your code
        }

        // array check
        $validator = Validator::make(['data' => $array],
            ['email' => 'string|min:1|max:10'],
            ['username' => 'string|min:1|max:10'],
            ['password' => 'string|min:1|max:10'],
            ['...' => '...']
        );

        if ($validator->fails()) {
            // your code
        }

Example 4: laravel unique validation

unique:table,column,except,idColumn

############## Example : ################

############### For Updating  
//rules
'email' => 'unique:users,email_address,' . $userId,

############### For Creating 
//rules
'email' => 'unique:users,email_address',

Example 5: validate field for existing client laravel

unique:users,username,id,1 // table, field, idcolumn, value to ignore

Example 6: laravel validation

Rule::unique('users')->ignore($user->id, 'user_id')