how to push a data into an array of objects in mongodb based on the name into the the completed array in the breakfast array how will it be done? - mongodb

Question

I want to add a current date into a user meal plan breakfast and find
the name of an object like a banana on condition and add a date to the
completed array?
this is the mongoose document .every food item contains an array of completed and every time a request is sent it will add or remove date on the completed array. i should be able to push date to the completed array
{
"_id": {
"$oid": "616f193e9eb4ca14afc47fa8"
},
"date": {
"$date": "2021-10-19T15:52:09.298Z"
},
"email": "john#live.com",
"firstName": "john",
"lastName": "doe",
"password": "$2b$10$jKylT8MKsUl7ZS03EVi7SecQ1eWuB37J5rLVTU/C8VXBwkWQQo6EK",
"role": "user",
"token": "eyJhbGciOiJIQb-JA2kcKxWquDaM",
"mealplan": {
"dietType": ["Halal", "Vegetarian", "Vegan"],
"religionType": ["Agnostic", "Muslim", "Christian", "Buddhist"],
"ethinicType": ["Asian", "Native American"],
"_id": "6179a178ba48312626059d44",
"name": "first meal",
"budget": 2000,
"orac": 163,
"medicinal": 0,
"breakfast": [
{
"type": "breakfast",
"completed": [],
"fdcId": 1103194,
"name": "Carrots, raw, salad",
"numbers": 1,
"unit": "100 grams",
"recurring": {
"startTime": "08:30",
"endTime": "09:30",
"startDate": "2021-10-28",
"endDate": "2021-11-03",
"daysofweek": []
}
},
{
"type": "breakfast",
"completed": [],
"name": "orange juice",
"numbers": 1,
"unit": "100 mililiters",
"recurring": {},
"orac": 10,
"medicinal_value": 0,
"nutrition": []
},
{
"type": "breakfast",
"name": "banana",
"completed": [],
"numbers": 1,
"unit": "100 grams"
}
]
},
"__v": 0
}
when I send a post request it will be the name of the food and date.
date show be added to the completed array in name of food

Answer 1

use arrayFilter like this
for example we want add to food with name of bnana
db.collection.update({},
{
$push: {
"mealplan.breakfast.$[arr].completed": "date" // put date here
}
},
{
arrayFilters: [
{
"arr.name": "banana" // name of food here
}
]
})
https://mongoplayground.net/p/lbzcF0YPuDF