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app/Models/LabelModel.php

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+<?php
+
+namespace App\Models;
+
+use App\BaseApp\BaseModel;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+
+/**
+ * 标签表
+ */
+class LabelModel extends BaseModel
+{
+    //
+    protected $table = 'labels';
+
+    protected $guarded  = [];
+
+    /**
+     * 项目关联
+     * @return BelongsToMany
+     */
+    public function projects(): BelongsToMany
+    {
+        return $this->belongsToMany(ProjectModel::class, 'project_labels_relations', 'label_id', 'project_id');
+    }
+}