Function SeedDB which deletes existing campground and adds new campground
It is a route for show page where comments are populated
It is the data which is used in seedb() as an element in for each.
Show page which displays campground and comments
this is the error which is popping
**这里是我第一次运行时成功运行的程序，但是当我再次执行该程序时，它会向我显示错误
无法读取null的属性“名称”
所以，我认为在第二次运行后，由于删除了空值而删除了数据，但是我不确定，请帮帮我！
“ **
