Push an element into an array if a field satisfies a condition, MongoDB

Question

I have the following structure:

"roles": [
  {
    "aspirants": ["Will Smith"],
    "description": {
      "content": "Role 1 content",
      "title": "Role 1"
    },
    "quantity": 12,
    "remunaration": 950
  },
  {
    "aspirants": ["Bruce Wayne"],
    "description": {
      "content": "Role 2 content",
      "title": "Role 2"
    },
    "quantity": 6,
    "remunaration": 1000
  }
]

So, what I need to do is to add a new aspirant matching the role he is postulating (that data is coming from the UI). For example, if "Tony Stark" is postulating to the "Role 1", then I have to update that field, so it will end as follows:

"roles": [
  {
    "aspirants": ["Will Smith", "Tony Stark"],
    "description": {
      "content": "Role 1 content",
      "title": "Role 1"
    },
    "quantity": 12,
    "remunaration": 950
  },
  {
    "aspirants": ["Bruce Wayne"],
    "description": {
      "content": "Role 2 content",
      "title": "Role 2"
    },
    "quantity": 6,
    "remunaration": 1000
  }
]

Any idea how can I achieve this? Of course, the roles are a field from a document.

Have you tried anything from Array Update Operators...

prasad_
– prasad_

2020-09-16 08:40:27 +00:00
Commented Sep 16, 2020 at 8:40 — prasad_
– prasad_, Commented Sep 16, 2020 at 8:40

varman · Accepted Answer · 2020-09-16 11:56:08Z

1

You can use with arrayFilters

db.collection.update(
    {},
    {$addToSet:{'roles.$[r].aspirants':"Spider man"}},
    { arrayFilters: [{ 'r.description.title': 'Role 1' }], new: true }
)

answered Sep 16, 2020 at 11:56

varman

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