slake-school-service/app/Models/MiniappUser.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Laravel\Sanctum\HasApiTokens;

class MiniappUser extends Authenticatable
{
    use HasApiTokens;
    use SoftDeletes;

    protected $fillable = [
        'openid',
        'unionid',
        'nickname',
        'avatar_url',
        'name',
        'mobile',
        'company',
        'job_title',
        'teacher_id',
        'converted_at',
        'status',
    ];

    protected $casts = [
        'teacher_id' => 'integer',
        'converted_at' => 'datetime',
        'status' => 'integer',
    ];

    public function teacher(): BelongsTo
    {
        return $this->belongsTo(Teacher::class);
    }

    public function courseSignups(): HasMany
    {
        return $this->hasMany(CourseSignup::class);
    }

    public function activitySignups(): HasMany
    {
        return $this->hasMany(ActivitySignup::class);
    }

    public function researchDirections(): BelongsToMany
    {
        return $this->belongsToMany(
            ResearchDirection::class,
            'miniapp_user_research_direction',
            'miniapp_user_id',
            'research_direction_id'
        )->orderBy('research_directions.sort')->orderBy('research_directions.name');
    }
}