I'm trying to update the name of a field in the mongodb document using the regex expression on the name of that field but I can't, can someone help me to do it?
I have a person document that contains a field with the email of the person, the name of that field is like that "firstname_lastname@gmail.com" and I want to replace "_" character in all email fields by "_dot_".
Here is what I did
:
db.getCollection("person").updateMany(
{
{'email.'+'.*_.*': { $exists: true }
},
{
$rename:{'email.'+'.*_.*': 'email.'+'.*_dot_.*'
});
and here the structure of my document:
person {
name: { .... }
email:{
firstname_lastname1@gmail.com : {
.... other fields
},
firstname_lastname2@gmail.com : {
.... other fields
}
}
}
thanks in advance
Nevertheless, you can use $objectToArray to convert the emails into an array of k-v tuples. Then, $split them by _ and rejoin by _dot_. Finally do a $arrayToObject to convert back to original structure.
db.collection.aggregate([
{
"$addFields": {
"email": {
"$objectToArray": "$email"
}
}
},
{
"$addFields": {
"email": {
"$map": {
"input": "$email",
"as": "e",
"in": {
k: {
"$ltrim": {
"input": {
"$reduce": {
"input": {
"$split": [
"$$e.k",
"_"
]
},
"initialValue": "",
"in": {
"$concat": [
"$$value",
"_dot_",
"$$this"
]
}
}
},
"chars": "_dot_"
}
},
v: "$$e.v"
}
}
}
}
},
{
"$addFields": {
"email": {
"$arrayToObject": "$email"
}
}
}
])
Here is the Mongo Playground for your reference.