How can I merge two documents, get rid of duplicates and keep certain data? - mongodb

Question

I have the following data, which describes who is going to do what work.
Basically I want to replace the "workId" and "userId" with objects that contain all the data from their respective documents and retain the "when" data.
I am starting with this data:
{
"schedule": {
"WorkId": "4e51dc1069c27c015ede4e3e",
"daily": [
{
"when": 1,
"U_W": [
{
"workId": "3a60dc1069c27c015ede1111",
"userId": "5f60c3b7f93d8e00a1cdf414"
},
{
"workId": "3a60dc1069c27c015ede1122",
"userId": "5f60c3b7f93d8e00a1cdf415"
}
]
}
]
}
}
Here is the user table
"userSchema": [
{
_id: "5f60c3b7f93d8e00a1cdf414",
Name: "Bob"
},
{
_id: "5f60c3b7f93d8e00a1cdf415",
Name: "Joe"
}
],
Here is the work table
"workSchema": [
{
_id: "3a60dc1069c27c015ede1111",
Name: "shovel"
},
{
_id: "3a60dc1069c27c015ede1122",
Name: "hammer"
}
]
what I want to end up with is this
{
"schedule": {
"WorkId": "4e51dc1069c27c015ede4e3e",
"daily": [
{
"when": 1,
"U_W": [
{
"work": {
"id": "3a60dc1069c27c015ede1111",
"name": "shovel"
},
"user": {
"id": "5f60c3b7f93d8e00a1cdf414",
"name": "bob"
}
},
{
"work": {
"id": "3a60dc1069c27c015ede1122",
"name": "hammer"
},
"user": {
"id": "5f60c3b7f93d8e00a1cdf415",
"name": "joe"
}
}
]
}
]
}
}
Here is my first attempt:
I have it joining the the two documents
How can I get rid of the duplicates ( bob:hammer and joe:shovel ) ?
and how do I include the "when" ?
Here is the playground that provides the following :
[
{
"_id": ObjectId("5a934e000102030405000000"),
"user_info": {
"Name": "Bob",
"_id": "5f60c3b7f93d8e00a1cdf414"
},
"work_role": {
"Name": "shovel",
"_id": "3a60dc1069c27c015ede1111"
}
},
{
"_id": ObjectId("5a934e000102030405000000"),
"user_info": {
"Name": "Bob",
"_id": "5f60c3b7f93d8e00a1cdf414"
},
"work_role": {
"Name": "hammer",
"_id": "3a60dc1069c27c015ede1122"
}
},
{
"_id": ObjectId("5a934e000102030405000000"),
"user_info": {
"Name": "Joe",
"_id": "5f60c3b7f93d8e00a1cdf415"
},
"work_role": {
"Name": "shovel",
"_id": "3a60dc1069c27c015ede1111"
}
},
{
"_id": ObjectId("5a934e000102030405000000"),
"user_info": {
"Name": "Joe",
"_id": "5f60c3b7f93d8e00a1cdf415"
},
"work_role": {
"Name": "hammer",
"_id": "3a60dc1069c27c015ede1122"
}
}
]

Answer 1

After beating my head against the wall for some time...
I found a pretty cool feature of mongo "references"
eg:
REF_work: { type: Schema.Types.ObjectId, required: true, ref: 'work' },
REF_person: { type: Schema.Types.ObjectId, required: true, ref: 'users' },
then when I call it from my get function I add a populate to the find
assignments.find(query).populate('daily.cp.REF_person').populate('daily.cp.REF_work');
I get exactly what I want:
[
{
"_id": ObjectId("5a934e000102030405000000"),
"REF_person": {
"Name": "Bob",
"_id": "5f60c3b7f93d8e00a1cdf414"
},
"REF_work": {
"Name": "shovel",
"_id": "3a60dc1069c27c015ede1111"
}
},
{
"_id": ObjectId("5a934e000102030405000000"),
"REF_person": {
"Name": "Joe",
"_id": "5f60c3b7f93d8e00a1cdf415"
},
"REF_work": {
"Name": "hammer",
"_id": "3a60dc1069c27c015ede1122"
}
}
]