Laravel lumen 另一个 table id 关系

Question

我做错了什么？

选项-迁移文件

Schema::create('option', function (Blueprint $table) {
      $table->increments('id');
      $table->integer('contents_content_id')->unsigned();
      $table->timestamps();
      $table->foreign('contents_content_id')
      ->references('content_id')
      ->on('contents');

});

内容迁移文件

 Schema::create('contents', function (Blueprint $table) {
          $table->increments('id');
          $table->integer('content_id');
          $table->timestamps();
   });

错误

[Illuminate\Database\QueryException] SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint (SQL: alter table option add constraint option_content_content_id_foreign foreign key (content_content_id) references contents (content_id))

[PDOException] SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint

Answer 1

问题是 option table 在 contents table 之前创建，当您在 content 上引用 content_id 时, content table 还不存在。

注意：

Each migration file name contains a timestamp which allows Laravel to determine the order of the migrations.

所以您现在要做的是从 database/migrations 文件夹中删除迁移并按顺序重新创建它们：首先 options 然后 contents.

Laravel lumen 另一个 table id 关系

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