播种 table 时数组到字符串的转换

Question

尝试为 table 播种时，显示 'array to string conversion' 错误。

这是错误的输出：

[Illuminate\Database\QueryException]
Array to string conversion (SQL: insert into `reviews` (`user_id`, `name`, `location`, `header`, `comments`, `identifier`, `stars`, `privacy`, `actioned`, `appr
oved`, `created_at`) values (10, Bradley Davis, Paulastad, Commodi quas expedita eum., Voluptas magni iusto nemo ea vitae harum quasi., 6c621319-c6ba-41c1-bb0b-696b602470
ef, 5, 1, 0, 1, 2017-03-25 11:44:12))

Table结构：

Schema::create('reviews', function (Blueprint $table) {
    $table->increments('id');
    $table->integer('user_id');
    $table->string('name')->nullable();
    $table->string('location')->nullable();
    $table->string('header')->nullable();
    $table->string('comments')->nullable();
    $table->uuid('identifier');
    $table->integer('stars')->nullable();
    $table->boolean('privacy')->default('1');
    $table->boolean('actioned')->default('0');
    $table->boolean('approved')->default('0');
    $table->nullableTimestamps();
});

种子函数：

for ($i = 1; $i < 41; $i++) {

    $name = User::where('id', $i + 9)->pluck('name')->all();
    $uuid = Uuid::generate(4);

    $review = [
        'user_id' => $i + 9,
        'name' => $name,
        'location' => $faker->city,
        'header' => $faker->sentence($nbWords = 3, $variableNbWords = true),
        'comments' => $faker->text($maxNbChars = 50),
        'identifier' => $uuid,
        'stars' => [1, 2, 3, 4, 5][rand(0, count([1, 2, 3, 4, 5]) - 1)],
        'privacy' => [1, 0][rand(0, count([1, 0]) - 1)],
        'actioned' => [1, 0][rand(0, count([1, 0]) - 1)],
        'approved' => [0, 1][rand(0, count([0, 1]) - 1)],
        'created_at' => Carbon::now()->subWeeks(array_rand([2, 3, 4, 5, 6, 7], 1))
   ];
}

DB::table('reviews')->insert($review);

print_r($评论):

Array
(
    [user_id] => 10
    [name] => Array
        (
            [0] => David Robertson
        )

    [location] => Lake Suzannechester
    [header] => Repellendus aut alias exercitationem.
    [comments] => Sunt non temporibus pariatur totam aut qui.
    [identifier] => Webpatser\Uuid\Uuid Object
        (
            [bytes:protected] => �a�?�IB��"�mLC�
            [hex:protected] =>
            [string:protected] => d51961bb-3fcf-4942-a0d9-22a56d4c4392
            [urn:protected] =>
            [version:protected] =>
            [variant:protected] =>
            [node:protected] =>
            [time:protected] =>
        )

    [stars] => 4
    [privacy] => 1
    [actioned] => 1
    [approved] => 1
    [created_at] => Carbon\Carbon Object
        (
            [date] => 2017-03-04 12:04:01.225487
            [timezone_type] => 3
            [timezone] => UTC
        )

)

Answer 1

如你所见，这里有多个问题，例如 $name 不包含名称，但它包含数组，你应该使用：

$name = User::find($i + 9)->name;

相反。

类似的是 $uuid - 它应该 return 字符串而不是一些对象。

另外当我看这部分的时候:

'stars' => [1, 2, 3, 4, 5][rand(0, count([1, 2, 3, 4, 5]) - 1)],
'privacy' => [1, 0][rand(0, count([1, 0]) - 1)],
'actioned' => [1, 0][rand(0, count([1, 0]) - 1)],
'approved' => [0, 1][rand(0, count([0, 1]) - 1)],
'created_at' => Carbon::now()->subWeeks(array_rand([2, 3, 4, 5, 6, 7], 1))

太复杂了。

你可以在这里使用这样的东西：

'stars' => rand(1, 5),
'privacy' => rand(0, 1),
'actioned' => rand(0, 1),
'approved' => rand(0, 1),
'created_at' => Carbon::now()->subWeeks(rand(2, 7))->toDateTimeString(),

还有：

DB::table('reviews')->insert($review);

你在循环外使用它吗？如果是这样，它没有多大意义，因为在每个循环运行中你再次设置它。但是，如果您在循环内执行此操作，您还可以将其优化为不运行如此多的插入（显然，对于 41 条记录，它不会产生太大差异，但对于数千条记录，它会产生影响）。

播种 table 时数组到字符串的转换

Array to string conversion when seeding a table

php

laravel

laravel-5

laravel-5.4

laravel-seeding