Update a nested array objects in a different collection and position in MongoDB - mongodb

Question

I have a douments like as follows.
How do I update a skillcluster name. Suppose the other document has name :"c" in 4th position.
{
Job: {
post: { name:"x" }
skill: {
skillcluster: [
{name:"c++",id:"23"},
{name:"c",id:"898"}
]
}
}
}
{
Job: {
post: { name:"x" }
skill: {
skillcluster: [
{name:"c++",id:"23"},
{name:"java"},
{name:"python"},
{name:"c",id:"898"}
]
}
}
}

Answer 1

You need to query to match the "name" field at the embedded level of the document using "dot notation", and then pass that match with the positional $ operator within the update:
db.collection.update(
{ "Job.skill.skillcluster.name": "c" },
{ "$set": { "Job.skill.skillcluster.$.name": "Simple C"}},
{ "multi": true }
)
Also use the "multi" flag to match and update more than one document.
The result will be:
{
"_id" : ObjectId("55dbfd0ed96d655eb0ed2b4f"),
"Job" : {
"post" : {
"name" : "x"
},
"skill" : {
"skillcluster" : [
{
"name" : "c++",
"id" : "23"
},
{
"name" : "Simple C",
"id" : "898"
}
]
}
}
}
{
"_id" : ObjectId("55dbfd0ed96d655eb0ed2b50"),
"Job" : {
"post" : {
"name" : "x"
},
"skill" : {
"skillcluster" : [
{
"name" : "c++",
"id" : "23"
},
{
"name" : "java"
},
{
"name" : "python"
},
{
"name" : "Simple C",
"id" : "898"
}
]
}
}
}