我的最愛追蹤功能製作

C:\project\animal\ > php artisan make:migration create_animal_user_table

// 這裡可以用 like 辨識
Route::post('animal/{animal}/like', 'AnimalController@like');

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateAnimalUserTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('animal_user', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->bigInteger('animal_id')->unsigned()->comment('動物ID');
            $table->bigInteger('user_id')->unsigned()->comment('使用者ID');
            $table->timestamps();
        });

        // Schema::table 訪法來對上面建立好的資料表 新增外鍵約束
        Schema::table('animal_user', function (Blueprint $table) {

            // user_id 外鍵
            $table->foreign('user_id')
                ->references('id')->on('users')
                ->onDelete('cascade');

            // animal_id 外鍵
            $table->foreign('animal_id')
                ->references('id')->on('animals')
                ->onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('animal_user', function (Blueprint $table) {
            // 刪除外鍵約束 （這個表名_外鍵名_foreign）
            $table->dropForeign('animal_user_user_id_foreign');
            $table->dropForeign('animal_user_animal_id_foreign');
        });

        Schema::dropIfExists('animal_user');
    }
}

/**
* 取得動物的刊登人
*/
public function user()
{
    return $this->belongsTo('App\User');
}

/**
* 多對多關聯animal與user
*/
public function like()
{
    return $this->belongsToMany('App\User')->withTimestamps();
}

/**
* 取得user 刊登的 animal
*/
public function animal()
{
    return $this->hasMany('App\Animal', 'user_id', 'id');
}

/**
* 多對多關聯animal與user
*/
public function like()
{
    return $this->belongsToMany('App\Animal')->withTimestamps();
}

use Auth;

/**
    * 動物加入或移除我的最愛
    *
    * @param  \App\Animal  $animal
    * @return \Illuminate\Http\Response
    */
public function like(Animal $animal)
{
    $animal->like()->toggle(Auth::user()->id);

    return response(null, Response::HTTP_NO_CONTENT);
}