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whole-estate/src/main/java/com/example/wholeestate/dao/ActivityMapper.java

 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import com.baomidou.mybatisplus.core.metadata.IPage;
 import com.example.wholeestate.model.Activity;
+import org.apache.ibatis.annotations.Param;
+import org.apache.ibatis.annotations.Select;
 
 /**
  * <p>
  */
 public interface ActivityMapper extends BaseMapper<Activity> {
 
+    /**
+     * 根据 活动id 查询报名人数
+     * @param activityId
+     * @return
+     */
+    @Select("select count(*) from ta_activity where activity_id = #{activityId}")
+    Integer signUpNumber(@Param("activityId") String activityId);
+
 }

whole-estate/src/main/java/com/example/wholeestate/model/Activity.java

      */
     @TableField(exist = false)
     private String buildingName;
+
+    /**
+     * 活动已经报名的人数
+     */
+    @TableField(exist = false)
+    private Integer signUpNumber;
 }

whole-estate/src/main/java/com/example/wholeestate/service/IBuildingDynamicService.java

     ResponseBean iBuildingDynamicSelectId(Integer id);
 
     /**
-     * 项目动态管理列表
+     * 微信小程序 项目动态管理列表
      * @return
      */
     ResponseBean getWxBuildingDynamiceList(Integer pageNum,Integer pageSize);
 
+    /**
+     * 微信小程序 项目详情
+     * @param dynamicId
+     * @return
+     */
+    ResponseBean getWxBuildingDynamiceInfo(String dynamicId);
+
 }

whole-estate/src/main/java/com/example/wholeestate/service/impl/ActivityServiceImpl.java

 package com.example.wholeestate.service.impl;
 
-import com.alibaba.fastjson.JSONObject;
 import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
 import com.baomidou.mybatisplus.core.metadata.IPage;
 import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
 import org.apache.commons.lang.StringUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
-import sun.security.krb5.internal.PAData;
 
 import java.util.Date;
+import java.util.List;
 
 /**
  * <p>
         queryWrapper.ge(null != beginDate,"begin_date", beginDate);
         queryWrapper.le(null != endDate,"end_date", endDate);
         IPage<Activity> activityIPage = activityMapper.selectPage(page, queryWrapper);
+        List<Activity> records = activityIPage.getRecords();
+        records.forEach(e -> {
+            Integer signUpNumber = activityMapper.signUpNumber(e.getActivityId());
+            e.setSignUpNumber(null == signUpNumber ? 0 : signUpNumber);
+        });
+
         responseBean.addSuccess(activityIPage);
         return responseBean;
     }

whole-estate/src/main/java/com/example/wholeestate/service/impl/BuildingDynamicServiceImpl.java

         responseBean.addSuccess(buildingDynamicIPage);
         return responseBean;
     }
+
+    @Override
+    public ResponseBean getWxBuildingDynamiceInfo(String dynamicId) {
+        ResponseBean responseBean = new ResponseBean();
+
+        QueryWrapper<BuildingDynamic> buildingDynamicQueryWrapper = new QueryWrapper<>();
+
+
+        return responseBean;
+    }
 }