Question

我正在创建一个带有日期字段的create post表单，而没有在表单中输入日期时，我创建了一个变数器以使数据库中的日期为NULL。

create.blade.php中的表格

#include <iostream>

int main() 
{
    while ( true )
    {
        std::cout << "Enter the Number You Want to Check (0 - exit): ";

        unsigned int n;

        if ( not ( std::cin >> n  ) or ( n == 0 ) ) break;

        unsigned int i = 2;
        while ( ( i <= n / i ) and ( n % i != 0 ) ) i++;

        if ( ( n == 1 ) or ( i <= n / i ) )
        {
            std::cout << "No, " << n << " is not prime.\n";
        }
        else
        {
            std::cout << "The number " << n << " is prime.\n";
        }
    }

    return 0;
}

Post.php中的Mutator：

Enter the Number You Want to Check (0 - exit): 1
No, 1 is not prime.
Enter the Number You Want to Check (0 - exit): 2
The number 2 is prime.
Enter the Number You Want to Check (0 - exit): 3
The number 3 is prime.
Enter the Number You Want to Check (0 - exit): 4
No, 4 is not prime.
Enter the Number You Want to Check (0 - exit): 5
The number 5 is prime.
Enter the Number You Want to Check (0 - exit): 6
No, 6 is not prime.
Enter the Number You Want to Check (0 - exit): 7
The number 7 is prime.
Enter the Number You Want to Check (0 - exit): 8
No, 8 is not prime.
Enter the Number You Want to Check (0 - exit): 9
No, 9 is not prime.
Enter the Number You Want to Check (0 - exit): 10
No, 10 is not prime.
Enter the Number You Want to Check (0 - exit): 0

在控制器中存储功能：

#include <iostream>

int main() 
{
    while ( true )
    {
        std::cout << "Enter the Number You Want to Check (0 - exit): ";

        unsigned int n;

        if ( not ( std::cin >> n  ) or ( n == 0 ) ) break;

        bool prime = n % 2 == 0 ? n == 2 : n != 1;

        for ( unsigned int i = 3; prime and i <= n / i; i += 2 )
        {
            prime = n % i;
        }

        if ( prime )
        {
            std::cout << "The number " << n << " is prime.\n";
        }
        else
        {
            std::cout << "No, " << n << " is not prime.\n";
        }
    }

    return 0;
}

我期望在数据库中不输入日期时该日期为NULL，但是在“在处发布的格式与Y-m-d H：i：s格式不匹配”时出现验证错误。而且不会提交

Answer 1

只需进行验证published_at=>'sometimes|date_format:Y-m-d H:i:s'

Answer 2

您可以执行以下操作

      'published_at' => 'nullable|date_format:Y-m-d H:i:s',

以及您的迁移文件您可以将属性设置为可空

$table->timestamp('published_at')->nullable();

因此，如果没有值，则可以为空

日期字段不是必需的，但没有它，表单将无法提交

2 个答案: