How to change the response in MongoDB using translatable fields - mongodb

Question

I am looking for the way how to resolve this and I can't find it. I appreciate your help.
I have a collection with products like:
[
{
"name": [
{ "es": "Producto 1" },
{ "en": "Product 1" }
]
"reference": "PR1",
"price": "20",
"description": [
{ "es": "Descripción 1" },
{ "en": "Description 1" }
]
}
]
And I would like to do:
db.products.aggregate(); // Find by language es for example:
And get:
[
{
"name": "Producto 1",
"reference": "PR1",
"price": "20",
"description": "Descripción 1"
}
]
Thanks very much.

Answer 1

I would suggest a schema change though to this:
[
{
"name" : [
{
"language" : "es",
"description" : "Producto 1"
},
{
"language" : "en",
"description" : "Product 1"
}
],
"reference" : "PR1",
"price" : "20",
"description" : [
{
"language" : "es",
"description" : "Descripción 1"
},
{
"language" : "en",
"description" : "Description 1"
}
]
}
]
cause then you could actually group by the language in your case.
If this is possible then you could do the following:
db.products.aggregate([
{$unwind: "$someName"},
{$unwind: "$someName.name"},
{$unwind: "$someName.description"},
{
$group: {
_id: {namelang: "$someName.name.language", namedesc: "$someName.description.language"},
name: {$first: "$someName.name.description"},
reference: {$first: "$someName.reference"},
price: {$first: "$someName.price"},
description: {$first: "$someName.description.description"}
}
},
{
$match: {
"_id.namelang": "en",
"_id.namedesc": "en"
}
}
])
FYI since you didn't provided your complete json I created one random. Here is the complete schema:
{
"_id" : ObjectId("59ea07a600f5db2660dbf162"),
"someName" : [
{
"name" : [
{
"language" : "es",
"description" : "Producto 1"
},
{
"language" : "en",
"description" : "Product 1"
}
],
"reference" : "PR1",
"price" : "20",
"description" : [
{
"language" : "es",
"description" : "Descripción 1"
},
{
"language" : "en",
"description" : "Description 1"
}
]
}
]
}