初始化项目：添加后端代码、ThinkPHP框架、前端资源

application/api/model/app/exchange/Batch.php

@@ -0,0 +1,58 @@
+<?php
+
+namespace app\api\model\app\exchange;
+
+use think\Model;
+use think\Db;
+use app\api\model\app\agent\Level;
+class Batch extends Model
+{
+
+
+    // 表名
+    protected $name = 'app_exchange_batch';
+
+
+    // 自动写入时间戳字段
+    protected $autoWriteTimestamp = 'integer';
+
+    // 定义时间戳字段名
+    protected $createTime = 'createtime';
+    protected $updateTime = false;
+    protected $deleteTime = false;
+
+    // 追加属性
+    protected $append = [
+    ];
+
+
+    /**
+     * 检查是否超出批次兑换限制
+     * @param $userId
+     * @param $code
+     * @return void true=未超限制；false=超出限制
+     */
+    public function checkLimit($userId,$batchId){
+
+        $batchInfo = self::where([
+            'id'=>$batchId
+        ])->find();
+
+        if(!$batchInfo){
+            return false;
+        }
+
+        //不限制
+        if(!$batchInfo['use_limit']){
+            return true;
+        }
+
+        $exchangeCount = \app\api\model\app\exchange\UseLog::getExchangeCount($userId,$batchId);
+
+        if($exchangeCount < $batchInfo['use_limit']){
+            return true;
+        }
+
+        return false;
+    }
+}

application/api/model/app/exchange/Code.php

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+<?php
+
+namespace app\api\model\app\exchange;
+
+use think\Model;
+use think\Db;
+use app\api\model\app\agent\Level;
+class Code extends Model
+{
+
+
+    // 表名
+    protected $name = 'app_exchange_code';
+
+
+    // 自动写入时间戳字段
+    protected $autoWriteTimestamp = 'integer';
+
+    // 定义时间戳字段名
+    protected $createTime = 'createtime';
+    protected $updateTime = false;
+    protected $deleteTime = false;
+
+    // 追加属性
+    protected $append = [
+    ];
+
+
+    /**
+     * 检查兑换码
+     * @param $code
+     * @return void
+     */
+    public function checkCode($code)
+    {
+
+        //判断有没有
+        $data = self::with(['batch'])->where([
+            'code'=>$code,
+            'code.status'=>1,
+            'batch.status'=>1,
+            'batch.starttime'=>['<',time()],
+            'batch.endtime'=>['>',time()]
+        ])->find();
+        
+        if(!$data){
+            return false;
+        }
+
+        return $data;
+    }
+
+
+    public function batch()
+    {
+        return $this->belongsTo('Batch', 'batch_id', 'id', [], 'LEFT')->setEagerlyType(0);
+    }
+
+
+    /**
+     * 兑换
+     * @param $userId 用户
+     * @param $goodsId 商品
+     * @return bool
+     */
+    public function exchange($userId,$batchId,$code)
+    {
+        $goods = \app\api\model\app\exchange\Goods::getBatchGoods($batchId);
+
+        if($goods){
+            $subscriptionModel = new \app\common\model\user\Subscription();
+            foreach ($goods as $item){
+                $subscriptionModel->setUserCourse($userId,$item['goods_id'],'exchange');
+
+                \app\api\model\app\exchange\UseLog::insert([
+                    'user_id'=>$userId,
+                    'uniacid'=>UNIACID,
+                    'goods_id'=>$item['goods_id'],
+                    'code'=>$code,
+                    'batch_id'=>$batchId,
+                    'createtime'=>time()
+                ]);
+
+                self::where([
+                    'code'=>$code,
+                    'batch_id'=>$batchId
+                ])->update([
+                    'user_id'=>$userId,
+                    'use_time'=>time(),
+                    'status'=>2
+                ]);
+            }
+        }
+
+        return true;
+    }
+
+}

application/api/model/app/exchange/Goods.php

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+<?php
+
+namespace app\api\model\app\exchange;
+
+use think\Model;
+use think\Db;
+use app\api\model\app\agent\Level;
+class Goods extends Model
+{
+
+
+    // 表名
+    protected $name = 'app_exchange_batch_goods';
+
+
+    // 自动写入时间戳字段
+    protected $autoWriteTimestamp = 'integer';
+
+    // 定义时间戳字段名
+    protected $createTime = 'createtime';
+    protected $updateTime = false;
+    protected $deleteTime = false;
+
+    // 追加属性
+    protected $append = [
+    ];
+
+
+    /**
+     * 获取批次包含的商品
+     * @return void
+     */
+    public static function getBatchGoods($batchId){
+        return self::with('course')->where([
+            'batch_id'=>$batchId
+        ])->select();
+
+    }
+
+
+    public function course()
+    {
+        return $this->belongsTo('app\api\model\course\Course', 'goods_id', 'id', [], 'RIGHT')->setEagerlyType(0);
+    }
+
+}

application/api/model/app/exchange/UseLog.php

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+<?php
+
+namespace app\api\model\app\exchange;
+
+use think\Model;
+use think\Db;
+use app\api\model\app\agent\Level;
+class UseLog extends Model
+{
+
+
+    // 表名
+    protected $name = 'app_exchange_use_log';
+
+
+    // 自动写入时间戳字段
+    protected $autoWriteTimestamp = 'integer';
+
+    // 定义时间戳字段名
+    protected $createTime = 'createtime';
+    protected $updateTime = false;
+    protected $deleteTime = false;
+
+    // 追加属性
+    protected $append = [
+    ];
+
+
+    /**
+     * 获取兑换次数
+     * @param $userId 用户
+     * @param $batchId 批次
+     * @return mixed
+     */
+    public static function getExchangeCount($userId,$batchId){
+        return self::where([
+            'user_id'=>$userId,
+            'batch_id'=>$batchId
+        ])->group('code')->count();
+    }
+
+    public function batch()
+    {
+        return $this->belongsTo('Batch', 'batch_id', 'id', [], 'LEFT')->setEagerlyType(0);
+    }
+
+
+    public function course()
+    {
+        return $this->belongsTo('app\api\model\course\Course', 'goods_id', 'id', [], 'LEFT')->setEagerlyType(0);
+    }
+
+
+}