Laravel 1075 table 定义不正确；只能有一个自动列，并且必须将其定义为键

Question

当我尝试在 laravel 中迁移此 table 时。

命令输出为：

[PDOException] SQLSTATE[42000]: Syntax error or access violation: 1075 Incorrect table definition; there can be only one auto column and it must be defined as a key

public function up()
{
    Schema::create('posts', function (Blueprint $table) {
        $table->increments('id');

        $table->bigInteger('post_author', 20);
        $table->text('post_title');
        $table->longText('post_content');
        $table->string('post_status', 20);
        $table->string('comment_status', 20);
        $table->string('post_type', 20);

        $table->timestamps();
        $table->softDeletes();
    });
}

Answer 1

不要为 bigInteger 列指定大小

$table->bigInteger('post_author');

Answer 2

通过以下方式指定 bigInteger 列的大小

$table->bigInteger('post_author')->length(20);

Laravel 1075 table 定义不正确；只能有一个自动列，并且必须将其定义为键

Laravel 1075 Incorrect table definition; there can be only one auto column and it mus t be defined as a key

php

laravel

laravel-5