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Question

我有这样的用户和项目迁移：

Schema::create('users', function (Blueprint $table) {
            $table->id();
            $table->string('name');
            $table->string('email')->unique();
            $table->timestamp('email_verified_at')->nullable();
            $table->string('password');
            $table->bigInteger('last_used_society_id');
            $table->bigInteger('last_used_project_id');
            $table->rememberToken();
            $table->timestamps();
        });

和

Schema::create('projects', function (Blueprint $table) {
            $table->id();
            $table->string('name');
            $table->string('eplan_name')->nullable();
            $table->bigInteger('society_id');
            $table->timestamps();

            //$table->foreign('user_id')->references('id')->on('users');
        });

        Schema::table('projects', function (Blueprint $table) {
            $table->foreign('society_id')->references('id')->on('societies');
        });

表Users在之后被修改为添加外国人：

    Schema::table('users', function (Blueprint $table) {
        $table->foreign('last_used_society_id')->references('id')->on('societies');
        $table->foreign('last_used_project_id')->references('id')->on('projects');
    });

在用户模型中，我有这样的设置：

public function ActualProject(){
    return $this->belongsTo('App\Models\Project', 'users_last_used_project_id_foreign');
}

public function ActualSociety(){
    return $this->belongsTo('App\Models\Society', 'users_last_used_society_id_foreign');
}

但是当我尝试调用$user->ActualProject时，它返回null

Answer 1

为什么使用'users_last_used_project_id_foreign'？

只需按原样使用列名...

public function ActualProject(){
    return $this->belongsTo('App\Models\Project', 'last_used_project_id');
}