I'm new to MongoDB. I've an object below
{
"_id" : "ABCDEFGH1234",
"level" : 0.6,
"pumps" : [
{
"pumpNo" : 1
},
{
"pumpNo" : 2
}
]
}
And I just want to move level field to pumps array's objects like this
{
"_id" : "ABCDEFGH1234",
"pumps" : [
{
"pumpNo" : 1,
"level" : 0.6
},
{
"pumpNo" : 2,
"level" : 0.6
}
]
}
I've check on MongoDB doc in Aggregation section but didn't found anything. In SQL by JOIN or SUB Query I'm able to do but here it's No-SQL
Could you please help me with this? Thankyou
Try this on for size:
db.foo.aggregate([
// Run the existing pumps array through $map and for each
// item (the "in" clause), create a doc with the existing
// pumpNo and bring in the level field from doc. All "peer"
// fields to 'pumps' are addressable as $field.
// By $projecting to a same-named field (pumps), we effectively
// overwrite the old pumps array with the new.
{$project: {pumps: {$map: {
input: "$pumps",
as: "z",
in: {pumpNo:"$$z.pumpNo", level:"$level"}
}}
}}
]);
Strongly recommend you explore the power of $map, $reduce, $concatArrays, $slice, and other array functions that make MongoDB query language different from the more scalar-based approach in SQL.