laravel 建数据库 迁移 的错误

General error: 1215 Cannot add foreign key constraint (SQL: alter table iphpt_categories add constraint iphpt_categories_art_id_foreign foreign key (art_id) references article (id) on delete cascade on update cascade)

Schema::create('iphpt_categories', function (Blueprint $table) {
    $table->engine = 'InnoDB';
    $table->integer('art_id')->unsigned();
    $table->integer('cate_id')->unsigned();

    $table->foreign('art_id')->references('id')->on('iphpt_article');
    $table->foreign('cate_id')->references('id')->on('iphpt_category');

    $table->primary(['art_id', 'cate_id']);

});

建立文章标签与文章对应的表时报错 然后把

 $table->integer('art_id')->unsigned();
 $table->integer('cate_id')->unsigned();

里面加上10

$table->integer('art_id')->unsigned(10);
$table->integer('cate_id')->unsigned(10);

然后就可以了！

运行这个语句前，iphpt_article 和 iphpt_category两个表必须存在，否则还会报错

SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint (SQL: alter table iphpt_tags add constraint iphpt_tags_tag_id_foreign foreign key (tag_id) references iphpt_tag (id))

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