大家好我有以下例子:
{
"_id" : ObjectId("591dea6af63ae97d813d3865"),
"borough" : "Queens",
"cuisine" : "American ",
"grades" : [ "A", "A", "B", "B" ],
"name" : "Yummy Fried Chicken And Pizza",
"restaurant_id" : "50000605"
}
我想更改S等级的所有A等级,我尝试了这个查询:
db.restaurants.update({},{$set: {grades : "S"}})
它似乎无法工作,任何想法如何做到这一点?
答案 0 :(得分:0)
答案是:
db.restaurants.update({},{$set: {grades.$ : "S"}})