I am new to mongoDB and I came across a problem. The data was imported according to official doc.
As you can see, each of restaurant has a grades array and the nested document contains a score field. What I want to do is according to the average score of each restaurant's grades and retrive the restaurant that has the top average score. This may need to use mongoDB's aggregate method but the document doesn't cover the nested document situation and I googled but without a result. There's a similar question on this site but it's not so clear.
[
{ "_id" : ObjectId("56a9f39cae1902590811dffc"),
"address" : { "building" : "284",
"coord" : [ -73.9829239, 40.6580753 ],
"street" : "Prospect Park West",
"zipcode" : "11215" },
"borough" : "Brooklyn",
"cuisine" : "American ",
"grades" : [ { "date" : ISODate("2014-11-19T00:00:00Z"), "grade" : "A", "score" : 11 },
{ "date" : ISODate("2013-11-14T00:00:00Z"), "grade" : "A", "score" : 2 },
{ "date" : ISODate("2012-12-05T00:00:00Z"), "grade" : "A", "score" : 13 },
{ "date" : ISODate("2012-05-17T00:00:00Z"), "grade" : "A", "score" : 11 } ],
"name" : "The Movable Feast",
"restaurant_id" : "40361606" },
...
]
Using the mongo shell, try the below , change "collecttionname" to the name of your your restaurant collections
db.collectionname.aggregate( { '$unwind' : '$grades' } , { '$group' : { '_id' : '$_id' , 'average' : { $avg : '$grades.score' } } } , { '$sort' : { 'average' : -1 } } , { '$limit' : 1 } )
Related
Hi i'm practicing mongodb and I'm stuck with a problem. I'av the following set of documents.
{
"_id" : ObjectId("57cf9a134607674792dbad9e"),
"address" : {
"building" : "351",
"coord" : [
-73.9851356,
40.7676919
],
"street" : "West 57 Street",
"zipcode" : "10019"
},
"borough" : "Manhattan",
"cuisine" : "Irish",
"grades" : [
{
"date" : ISODate("2014-09-06T00:00:00.000Z"),
"grade" : "A",
"score" : 2
},
{
"date" : ISODate("2013-07-22T00:00:00.000Z"),
"grade" : "A",
"score" : 11
},
{
"date" : ISODate("2012-07-31T00:00:00.000Z"),
"grade" : "A",
"score" : 12
},
{
"date" : ISODate("2011-12-29T00:00:00.000Z"),
"grade" : "A",
"score" : 12
}
],
"name" : "Dj Reynolds Pub And Restaurant",
"restaurant_id" : "30191841"
}
I want to fetch list of all documents where zipcode is 10019
I'm following mongodb db tutorials and i've tried the following queries but nothing seems to work and i'm getting zero errors.
db.restaurants.find({address:{zipcode:10019}});
db.restaurants.find({"address.zipcode":10019})
zipcode is a string so your query should be
db.restaurants.find({ "address.zipcode": "10019" })
instead of
db.restaurants.find({ "address.zipcode": 10019 })
I'm just starting out with Mongo, and following the documentation here, I can't seem to update a value in a nested array when I apply the same technique.
This is my document:
{
"_id" : ObjectId("56d2cf8ee2b075667d4f0545"),
"address" : {
"building" : "522",
"coord" : [
-73.95171,
40.767461
],
"street" : "East 74 Street",
"zipcode" : "10021"
},
"borough" : "Manhattan",
"cuisine" : "American ",
"grades" : [
{
"date" : ISODate("2014-09-02T00:00:00Z"),
"grade" : "A",
"score" : 12
},
{
"grade" : "B",
"score" : 16,
"date" : ISODate("2013-12-19T00:00:00Z")
},
{
"date" : ISODate("2013-05-28T00:00:00Z"),
"grade" : "A",
"score" : 9
},
{
"date" : ISODate("2012-12-07T00:00:00Z"),
"grade" : "A",
"score" : 13
},
{
"date" : ISODate("2012-03-29T00:00:00Z"),
"grade" : "A",
"score" : 11
}
],
"name" : "Glorious Food",
"restaurant_id" : "40361521"
}
and this is my query:
db.restaurants.update(
{
_id: 'ObjectId("56d2cf8ee2b075667d4f0545")',
'grades.date': 'ISODate("2014-09-02T00:00:00Z")'
},
{
$set: { 'grades.$.score': 1 }
}
)
I'm sure I must have missed something obvious.
remove quotes from objectId and date field - please see below:
db.restaurants.update(
{
_id: ObjectId("56d2cf8ee2b075667d4f0545"),
"grades.date": ISODate("2014-09-02T00:00:00Z")
},
{
$set: { 'grades.$.score': 1 }
}
)
I'm having trouble figuring out the right aggregation pipe operations to return the results I need.
I have a collection similar to the following :-
{
"_id" : "writer1",
"Name" : "writer1",
"Website" : "website1",
"Reviews" : [
{
"Film" : {
"Name" : "Jurassic Park",
"Genre" : "Action"
},
"Score" : 4
},
{
"Technology" : {
"Name" : "Mad Max",
"Genre" : "Action"
},
"Score" : 5
}
]
}
{
"_id" : "writer2",
"Name" : "writer2",
"Website" : "website1",
"Reviews" : [
{
"Technology" : {
"Name" : "Mad Max",
"Genre" : "Action"
},
"Score" : 5
}
]
}
And this is my aggregation so far : -
db.writers.aggregate([
{ "$unwind" : "$Reviews" },
{ "$match" : { "Reviews.Film.Name" : "Jurassic Park" } },
{ "$group" : { "_id" : "$Website" , "score" : { "$avg" : "$Reviews.Score" },
writers :{ $push: { name:"$Name", score:"$Reviews.Score" } }
}}
])
This returns only writers who have a review of the matching film and also only websites that have at least 1 writer who has reviewed the film,
however, I need to return all websites containing a list of their all writers, with a score of 0 if they haven't written a review for the specified film.
so, I am currently getting : -
{ "_id" : "website1", "score" : 4, "writers" : [ { "name" : "writer1", "score" : 4 } ] }
When I actually need : -
{ "_id" : "website1", "score" : 2, "writers" : [ { "name" : "writer1", "score" : 4 },{ "name" :"writer2", "score" : 0 } ] }
Can anyone point me in the right direction?
Cheers
I have a nested embedded document CompanyProduct below is structure
{
"_id" : ObjectId("53d213c5ddbb1912343a8ca3"),
"CompanyID" : 90449,
"Name" : Company1,
"CompanyDepartment" : [
{
"_id" : ObjectId("53d213c5ddbb1912343a8ca4")
"DepartmentID" : 287,
"DepartmentName" : "Stores",
"DepartmentInventory" : [
{
"_id" : ObjectId("53b7b92eecdd765430d763bd"),
"ProductID" : 1,
"ProductName" : "abc",
"Quantity" : 100
},
{
"_id" : ObjectId("53b7b92eecdd765430d763bd"),
"ProductID" : 2,
"ProductName" : "xyz",
"Quantity" : 1
}
],
}
],
}
There can be N no of companies and each company can have N number of departments and each department can have N number of products.
I want to do a search to find out a particular product quantity under a particular company
I tried below query but it does not work. It returns all the products for the specific company, the less than 20 condition doesn't work.
db.CompanyProduct.find({$and : [{"CompanyDepartment.DepartmentInventory.Quantity":{$lt :20}},{"CompanyID":90449}]})
How should the query be?
You are searching from companyProduct's sub documents. So it will return you companyProduct whole document, it is NoSQL database , some how we do not need to normalize the collection , but your case it has to be normalize , like if you want to EDIT/DELETE any sub document and if there are thousand or millions of sub document then what will you do ... You need to make other collection with the name on CompanyDepartment and companyProduct collection should be
productCompany
{
"_id" : ObjectId("53d213c5ddbb1912343a8ca3"),
"CompanyID" : 90449,
"Name" : Company1,
"CompanyDepartment" : ['53d213c5ddbb1912343a8ca4'],
}
and other collection companyDepartment
{
"_id" : ObjectId("53d213c5ddbb1912343a8ca4")
"DepartmentID" : 287,
"DepartmentName" : "Stores",
"DepartmentInventory" : [
{
"_id" : ObjectId("53b7b92eecdd765430d763bd"),
"ProductID" : 1,
"ProductName" : "abc",
"Quantity" : 100
},
{
"_id" : ObjectId("53b7b92eecdd765430d763bd"),
"ProductID" : 2,
"ProductName" : "xyz",
"Quantity" : 1
}
],
}
after this you got array of companyDeparment' ID and only push and pull query will be used on productCompany
A Solution can be
db.YourCollection.aggregate([
{
$project:{
"CompanyDepartment.DepartmentInventory":1,
"CompanyID" : 1
}
},{
$unwind: "$CompanyDepartment"
},{
$unwind: "$CompanyDepartment.DepartmentInventory"
},{
$match:{$and : [{"CompanyDepartment.DepartmentInventory.Quantity":{$lt :20}},{"CompanyID":90449}]}
}
])
the result is
{
"result" : [
{
"_id" : ObjectId("53d213c5ddbb1912343a8ca3"),
"CompanyID" : 90449,
"CompanyDepartment" : {
"DepartmentInventory" : {
"_id" : ObjectId("53b7b92eecdd765430d763bd"),
"ProductID" : 2,
"ProductName" : "xyz",
"Quantity" : 1
}
}
}
],
"ok" : 1
}
From the data as given below, I want to sum all Values fields.
Please let me know how can I do it using aggregation functionality of mongodb.
{"MetricRecord":
{ "SchemaVersion" : "0.12",
"Product": {
"ProductName" : "abc",
"ProductVersion": "7.5.0.1" ,
"ProductId" : "1234567890ABDFGH12345",
"InstanceId" : "12345BA32",
"InstanceName" : "1234SS123",
"SystemId" : "somehost.com"
},
"Tenant" : {
"CustomerId" : "222-555-124",
"ServiceCode": "xyzxyzxyz12345yyy"
},
"Metrics" : [
{
"ReportType" :[
{ "report" : "billing" },
],
"LogTime" : "2013-12-08T12:34:56:01Z" ,
"Type" : "AuthorizedUsers",
"SubType" : "registered",
"Value" : "125",
"UnitOfMeasure": "USD",
"Period" : {
"StartTime" : "2013-12-07T00:00:00:01Z",
"EndTime" : "2013-12-08T00:00:00:01Z"
}
},
{
"ReportType" :[
{ "report" : "billing" }
],
"LogTime" : "2013-12-08T12:34:56:01Z" ,
"Type" : "NumberOfTickets",
"SubType" : "resolved",
"Value" : "430",
"UnitOfMeasure": "USD",
"Period" : {
"StartTime" : "2013-12-07T00:00:00:01Z",
"EndTime" : "2013-12-08T00:00:00:01Z"
}
}
]
}
}
So, results which I expect from summation of values is 430+125 i.e. 555
Your document contains string value for MetricRecord.Metrics[index].Value field and i am not sure why are you trying to sum up the string values. if it is a typo and your document contains numerical values for MetricRecord.Metrics[index].Value field then you can try the following query
db.metrics.aggregate([
{$unwind:"$MetricRecord.Metrics"},
{$group:{_id:"$_id",sum:{$sum:"$MetricRecord.Metrics.Value"}}}
])
In the above document posted, if your value field is like
MetricRecord.Metrics[0].Value is 125(not "125")
MetricRecord.Metrics[1].Value is 430(not "430")
you will get the following output
{
"result" : [
{
"_id" : ObjectId("xxxxxxxxxxxxxxxxxxxxxxxx"),
"sum" : 555
}
],
"ok" : 1
}
The above sample query is composed assuming you have the default mongodb "_id" field and you are using a metrics collection. You have to manipulate the query as per you requirements.