Laravel 5.4 Upgrade — Integrity constraint violation - Column cannot be null

问题

The strange thing is -- all of this was working at 5.2, but I don't know what could have changed to make this happen. Below is the error and the array being inserted.

SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'gender' cannot be null (SQL: insert into `tenants` (`name`, `phone`, `email`, `description`, `gender`, `date_birth`, `background_check_status`, `picture_url`, `work`, `position`, `country`, `location`, `hobbies`, `updated_at`, `created_at`) values (Amadeo Levy Luna, 18065496549, amadeo.luna@ttu.edu, , , 2017-05-08 20:29:50, 0, , , , , , , 2017-05-08 20:29:50, 2017-05-08 20:29:50)) ◀"
array:13 [▼
  "_token" => "9HeacY4KskT5vpLPGCUTkzVxRcpcKMNjdob79aLs"
  "name" => "Amadeo Levy Luna"
  "phone" => "18065496549"
  "email" => "amadeo.luna@ttu.edu"
  "description" => null
  "gender" => null
  "background_check_status" => "0"
  "picture_url" => null
  "work" => null
  "position" => null
  "country" => null
  "location" => null
  "hobbies" => null
]

This is breaking in many different fields all over the website, but none of them broke before. What changed in Laravel to create this?

回答1:

Assuming nothing changed in your code the only thing I could think of is the two new middleware introduced in 5.4: TrimStrings and ConvertEmptyStringsToNull.

Try comment the latter or both in app\Http\Kernel.php

class Kernel extends HttpKernel
{
    protected $middleware = [
        \Illuminate\Foundation\Http\Middleware\CheckForMaintenanceMode::class,
        \Illuminate\Foundation\Http\Middleware\ValidatePostSize::class,
        \App\Http\Middleware\TrimStrings::class,
        // \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class,
    ];

    // ...
}

回答2:

Continuing on @peterm's anwser.

If you still want to convert empty strings to null (for other parts of your application) and don't want to uncomment \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull::class, you have two options.

Add nullable to your column in the database.
Use events such as saving on your model to add a default value to your property if it is null.

Here is an example on how to add nullable to your columns (if you've already created the table and if you're using mysql):

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class AddNullToColumns extends Migration {
    public function __construct() {
        $this->charset = config('database.connections.mysql.charset');
        $this->collate = config('database.connections.mysql.collation');
    }
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up() {
        // Change multiple columns on a table.
        DB::statement("ALTER TABLE `" . (new \App\User)->getTable() . "`
            CHANGE `phone` `phone` VARCHAR(255) CHARACTER SET {$this->charset} COLLATE {$this->collate} NULL DEFAULT NULL,
            CHANGE `address` `address` TEXT CHARACTER SET {$this->charset} COLLATE {$this->collate} NULL DEFAULT NULL,
            CHANGE `comment` `comment` TEXT CHARACTER SET {$this->charset} COLLATE {$this->collate} NULL DEFAULT NULL;");

        // Change one column on a table.
        DB::statement("ALTER TABLE `" . (new \App\Report)->getTable() . "` CHANGE `comment` `comment` TEXT CHARACTER SET {$this->charset}COLLATE {$this->collate}NULL DEFAULT NULL");
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down() {
        DB::statement("ALTER TABLE `" . (new \App\User)->getTable() . "`
            CHANGE `phone` `phone` VARCHAR(255) CHARACTER SET {$this->charset} COLLATE {$this->collate} NOT NULL,
            CHANGE `address` `address` TEXT CHARACTER SET {$this->charset} COLLATE {$this->collate} NOT NULL,
            CHANGE `comment` `comment` TEXT CHARACTER SET {$this->charset} COLLATE {$this->collate} NOT NULL;");

        DB::statement("ALTER TABLE `" . (new \App\Report)->getTable() . "` CHANGE `comment` `comment` TEXT CHARACTER SET {$this->charset}COLLATE {$this->collate}NOT NULL");
    }
}

Here is an example on how to use events:

<?php

namespace App;

class User extends Authenticatable {
    public static function boot() {
        // When creating or updated the model.
        static::saving(function($model){
            // Use value of gender if available, if `null` use `unisex`.
            $model->gender = $model->gender ?: 'unisex';
        });
    }
}

来源：https://stackoverflow.com/questions/43860634/laravel-5-4-upgrade-integrity-constraint-violation-column-cannot-be-null

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laravel-5.4