first version

app/Models/SupplierModel.php

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+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+/**
+ * 供应商模型（采购单接收方）
+ */
+class SupplierModel extends Model
+{
+    use SoftDeletes, HasFactory;
+
+    /** 状态：停用 */
+    public const STATUS_DISABLED = 0;
+    /** 状态：正常 */
+    public const STATUS_NORMAL = 1;
+
+    protected $table = 'supplier';
+    protected $primaryKey = 'id';
+
+    protected $fillable = [
+        'name',
+        'contact',
+        'phone',
+        'address',
+        'main_products',
+        'status',
+        'remark',
+    ];
+
+    protected $casts = [
+        'status' => 'integer',
+    ];
+
+    /**
+     * 供应商供货的商品
+     */
+    public function products(): HasMany
+    {
+        return $this->hasMany(ProductModel::class, 'supplier_id', 'id');
+    }
+
+    /**
+     * 供应商的采购明细行
+     */
+    public function purchaseItems(): HasMany
+    {
+        return $this->hasMany(PurchaseOrderItemModel::class, 'supplier_id', 'id');
+    }
+
+    /**
+     * 绑定本供应商的小程序用户
+     */
+    public function users(): HasMany
+    {
+        return $this->hasMany(UserModel::class, 'supplier_id', 'id');
+    }
+}