MongoDB Aggregate Regex Match or Full Text Search returns whole Document - regex

Question

Ex. Record
[
{
"_id": "5528cfd2e71144e020cb6494",
"__v": 11,
"Product": [
{
"_id": "5528cfd2e71144e020cb6495",
"isFav": true,
"quantity": 27,
"price": 148,
"description": "100g",
"brand": "JaldiLa",
"name": "Grapes",
"sku": "GRP"
},
{
"_id": "552963ed63d867b81e18d357",
"isFav": false,
"quantity": 13,
"price": 290,
"description": "100g",
"brand": "JaldiLa",
"name": "Apple",
"sku": "APL"
}
],
"brands": [
"Whole Foods",
"Costco",
"Bee's",
"Masons"
],
"sku": "FRT",
"name": "Fruits"
}
]
My Mongoose function to return query from AngularJS(http://localhost:8080/api/search?s=)
router.route('/search')
.get(function(req, res) {
Dept.aggregate(
{ $match: { $text: { $search: req.query.s } } },
{ $project : { name : 1, _id : 1, 'Product.name' : 1, 'Product._id' : 1} },
{ $unwind : "$Product" },
{ $group : {
_id : "$_id",
Category : { $addToSet : "$name"},
Product : { $push : "$Product"}
}}
)
});
RESULT: e.g. http://localhost:8080/api/search?s=Apple / Grape / Carrot, result is same for all.
[
{
"_id": "5528cfd2e71144e020cb6494",
"Category": ["Fruits"],
"Product": [
{
"_id": "5528cfd2e71144e020cb6495",
"name": "Grapes"
},
{
"_id": "552963ed63d867b81e18d357",
"name": "Apple"
},
{
"_id": "552e61920c530fb848c61510",
"name": "Carrots"
}
]
}
]
PROBLEM: On a query of "apple", it returns all objects within Product instead of just "grapes", i think maybe putting match after unwind would do the trick or $regex case
WHAT I WANT: e.g. for a searchString of "grape"
Also I want it to start sending results as soon as I send in the first two letters of my query.
[{
"_id": ["5528cfd2e71144e020cb6494"], //I want this in array as it messes my loop up
"Category": "Fruits", //Yes I do not want this in array like I'm getting in my resutls
"Product": [{
"_id": "5528cfd2e71144e020cb6495",
"name": "Grapes"
}]
}]
Thanks for being patient.

Answer 1

Use the following aggregation pipeline:
var search = "apple",
pipeline = [
{
"$match": {
"Product.name": { "$regex": search, "$options": "i" }
}
},
{
"$unwind": "$Product"
},
{
"$match": {
"Product.name": { "$regex": search, "$options": "i" }
}
},
{
"$project": {
"Category": "$name",
"Product._id": 1,
"Product.name": 1
}
}
];
db.collection.aggregate(pipeline);
With the above sample document and a regex (case-insensitive) search for "apple" on the name field of the Product array, the above aggregation pipeline produces the result:
Output:
/* 1 */
{
"result" : [
{
"_id" : "5528cfd2e71144e020cb6494",
"Product" : {
"_id" : "552963ed63d867b81e18d357",
"name" : "Apple"
},
"Category" : "Fruits"
}
],
"ok" : 1
}