MongoDB field must be an array - mongodb

Question

Currently I have a collection with the following documents:
[
{
"_id": ObjectId("628e6bd640643f97d6517c75"),
"company": "bau",
"current_version": 0,
"form_name": "don't know",
"history": [],
"id": "23421123-24a9-4a45-a12f-27a330152ax3",
"is_active": True,
"user_id": "999",
},
{
"_id": ObjectId("628eaffe4b8ae2ccdeb9305c"),
"company": "vrau",
"current_version": 0,
"form_name": "exemplo",
"history": [
{
"content": [
{
"field_id": 0,
"label": "insira um texto",
"placeholder": "qualquer texto",
"type": "text",
}
],
"layout": [
{"field_id": 0, "h": 10, "type": "text", "w": 100, "x": 0, "y": 0}
],
"responses": [
{
"client_id": 100,
"response_date": "2020-01-02",
"values": [{"field_id": 0, "value": "um texto"}],
},
{
"client_id": 2,
"response_date": "2020-01-01",
"values": [{"field_id": 0, "value": "roi"}],
},
],
"version": 0,
}
],
"id": "33b66684-24a9-4a45-a12f-27a330152ac8",
"is_active": True,
"user_id": "1",
},
]
I want to change the response fromthe client_id = '2' by I'm receiving the following error:
pymongo.errors.WriteError: The field 'history.0.responses.1' must be an array but is of type object in document {_id: ObjectId('628eaffe4b8ae2ccdeb9305c')}, full error: {'index': 0, 'code': 2, 'errmsg': "The field 'history.0.responses.1' must be an array but is of type object in document {_id: ObjectId('628eaffe4b8ae2ccdeb9305c')}"}
I don't know what I'm doing wrong and this error doesnt make sense to me cuz reponses is an array.
my current query:
collection.update_many(
{"id": "33b66684-24a9-4a45-a12f-27a330152ac8", "history.version": 0},
{
"$push": {
"history.$[h].responses.$[r]": {
"client_id": 2,
"response_date": "2020-01-01",
"values": [{"field_id": 0, "value": "roi"}],
}
}
},
array_filters=[{"h.version": 0}, {"r.client_id": "2"}],
)
Is there another to do it?

Answer 1

It is because you are also performing filter on r, which already resolves to object level in responses array.
You can simply abandon the r arrayFilter if you simply want to push to responses array.
collection.update_many(
{"id": "33b66684-24a9-4a45-a12f-27a330152ac8", "history.version": 0},
{
"$push": {
"history.$[h].responses": {
"client_id": 2,
"response_date": "2020-01-01",
"values": [{"field_id": 0, "value": "roi"}],
}
}
},
array_filters=[{"h.version": 0}],
)
Here is the Mongo playground for your reference. (in native js syntax)
You should use $set instead of $push if you want to update the entry instead of adding an entry. In your given example, the client_id is int while your arrayFilter is string. It could cause problem if it is not intended.
collection.update_many(
{"id": "33b66684-24a9-4a45-a12f-27a330152ac8", "history.version": 0},
{
"$set": {
"history.$[h].responses.$[r]": {
"client_id": 2,
"response_date": "2020-01-01",
"values": [{"field_id": 0, "value": "roi"}],
}
}
},
array_filters=[{"h.version": 0}, {"r.client_id": 2}],
)
Here is the Mongo playground for your reference. (in native js syntax)