文章对应分类多个

database/migrations/2021_04_01_151442_create_article_categories_table.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class CreateArticleCategoriesTable extends Migration
+{
+
+    /**
+     * Run the migrations.
+     * @return void
+     */
+    public function up()
+    {
+        Schema::create('article_category', function (Blueprint $table) {
+            $table->foreignId('article_id');
+            $table->foreignId('category_id');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     * @return void
+     */
+    public function down()
+    {
+        Schema::dropIfExists('article_categories');
+    }
+
+}