want to update only value element of specific key on mongodb - node.js

Question

I have a dataset like this:
{
"_id" : ObjectId("5a7bee68996b551034015a15"),
"sequenceid" : 1,
"fruit" : [
{
"name" : "#APPLE",
"value" : 2
},
{
"name" : "#BANANA",
"value" : 1
},
{
"name" : "#ORANGE",
"value" : 5
}
}
want to update only Apple value i.e from 2 to 25. Expected result will be:
{
"_id" : ObjectId("5a7bee68996b551034015a15"),
"sequenceid" : 1,
"fruit" : [
{
"name" : "#APPLE",
"value" : 25
},
{
"name" : "#BANANA",
"value" : 1
},
{
"name" : "#ORANGE",
"value" : 5
}
}
I tried the code but this will replace all entry and do only one entry. My code is
db.Collection.update({'sequenceid': 1}, {$set: {'fruit' : {'name': '#APPLE', 'value': parseFloat(25)}}}, function(error, result){
if(error){
console.log('error');
} else {
console.log('success');
}
});
It can produce the result:
{
"_id" : ObjectId("5a7bee68996b551034015a15"),
"sequenceid" : 1,
"fruit" : [
{
"name" : "#APPLE",
"value" : 25
}
}//Delete all my rest entry
How I can Do this. I am a newbie on MongoDB

Answer 1

This will update only the first occurrence of record.For reference MongoDB - Update objects in a document's array (nested updating)
db.collection.update({ _id: ObjectId("5a7bf5586262dc7b9f3a8422") ,"fruit.name" : "#APPLE"},
{ $set:
{
"fruit.$.value" : 25
}
})

Answer 2

If you are writing JavaScript query then you can update like this
db.collection.find({'sequenceid': 1}).forEach(function(x){
x.fruit.forEach(function(y){
if(y.name=="#APPLE")
{
y.value = 25
}
})
db.collection.update({_id:x._id},x)
})

Answer 3

db.Collection.update({
_id: ObjectId("5a7bee68996b551034015a15"),
"fruit": {
$elemMatch: {
"name": "#APPLE"
}
}
}, {
$set: {
"fruit.$.value": 25
}
})
In above update operation $elemMatch operator is used to search a value in an array and in $set stage positional operator $ is used to update value of specific key belonging to an array element