Mixing
How to filter a array element in c# mongo db driver
I have array in a document like this
{
"samples": [
[
25,
"1535530415"
],
[
"45",
"1535530415"
]
]
}
and i try to fetch the value based on second value of each array
my filter query is
var collection = database.GetCollection<BsonDocument>("History");
FilterDefinition<BsonDocument> filterDefintion = null ;
ProjectionDefinition<BsonDocument> project = Builders<BsonDocument>.Projection.Include("samples").Exclude("_id");
filterDefintion = Builders<BsonDocument>.Filter.Eq("samples[1]","1535530415");
but it getting an empty array.how to filter the array values in mongo c# driver.
c# mongodb
asked Nov 22 '18 at 10:17
arun thomasarun thomas
187
add a comment |
I have array in a document like this
{
"samples": [
[
25,
"1535530415"
],
[
"45",
"1535530415"
]
]
}
and i try to fetch the value based on second value of each array
my filter query is
var collection = database.GetCollection<BsonDocument>("History");
FilterDefinition<BsonDocument> filterDefintion = null ;
ProjectionDefinition<BsonDocument> project = Builders<BsonDocument>.Projection.Include("samples").Exclude("_id");
filterDefintion = Builders<BsonDocument>.Filter.Eq("samples[1]","1535530415");
but it getting an empty array.how to filter the array values in mongo c# driver.
c# mongodb
asked Nov 22 '18 at 10:17
arun thomasarun thomas
187
add a comment |
I have array in a document like this
{
"samples": [
[
25,
"1535530415"
],
[
"45",
"1535530415"
]
]
}
and i try to fetch the value based on second value of each array
my filter query is
var collection = database.GetCollection<BsonDocument>("History");
FilterDefinition<BsonDocument> filterDefintion = null ;
ProjectionDefinition<BsonDocument> project = Builders<BsonDocument>.Projection.Include("samples").Exclude("_id");
filterDefintion = Builders<BsonDocument>.Filter.Eq("samples[1]","1535530415");
but it getting an empty array.how to filter the array values in mongo c# driver.
c# mongodb
asked Nov 22 '18 at 10:17
arun thomasarun thomas
187
I have array in a document like this
{
"samples": [
[
25,
"1535530415"
],
[
"45",
"1535530415"
]
]
}
and i try to fetch the value based on second value of each array
my filter query is
var collection = database.GetCollection<BsonDocument>("History");
FilterDefinition<BsonDocument> filterDefintion = null ;
ProjectionDefinition<BsonDocument> project = Builders<BsonDocument>.Projection.Include("samples").Exclude("_id");
filterDefintion = Builders<BsonDocument>.Filter.Eq("samples[1]","1535530415");
but it getting an empty array.how to filter the array values in mongo c# driver.
c# mongodb
c# mongodb
asked Nov 22 '18 at 10:17
arun thomasarun thomas
187
asked Nov 22 '18 at 10:17
arun thomasarun thomas
187
asked Nov 22 '18 at 10:17
arun thomasarun thomas
187
asked Nov 22 '18 at 10:17
arun thomasarun thomas
187
asked Nov 22 '18 at 10:17
arun thomasarun thomas
187
187
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Your sample document contains an array of arrays. To reference item at index 1 you can take advantage of the fact that in JS an array can be considered as an object where indexes are the properties, so in your case what you're storing can also be interpreted as:
{
"samples": [
{
"0": 25,
"1": "1535530415"
},
{
"0": 45,
"1": "1535530415"
}
]
}
knowing that you can use $elemMatch to reference the right element:
db.History.find({ "samples": { $elemMatch: { 1: "1535530415" } } })
or in C# code:
filterDefintion = Builders<BsonDocument>.Filter.ElemMatch<BsonDocument>("samples", new BsonDocument() { { "1", "1535530415" } });
answered Nov 23 '18 at 18:55
micklmickl
14.2k51638
mickl is it possible to check the key (ex "0" ) is present or not?
– arun thomas
Dec 10 '18 at 14:21
1
@arunthomas sure, you can use $exists operator, like:db.History.find({ "samples": { $elemMatch: { 1: "1535530415" } }, "samples.1": { $exists: true } })
– mickl
Dec 10 '18 at 16:56
in C# code: Builders<BsonDocument>.Filter.Exists("0");
– arun thomas
Dec 18 '18 at 12:30
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Your sample document contains an array of arrays. To reference item at index 1 you can take advantage of the fact that in JS an array can be considered as an object where indexes are the properties, so in your case what you're storing can also be interpreted as:
{
"samples": [
{
"0": 25,
"1": "1535530415"
},
{
"0": 45,
"1": "1535530415"
}
]
}
knowing that you can use $elemMatch to reference the right element:
db.History.find({ "samples": { $elemMatch: { 1: "1535530415" } } })
or in C# code:
filterDefintion = Builders<BsonDocument>.Filter.ElemMatch<BsonDocument>("samples", new BsonDocument() { { "1", "1535530415" } });
answered Nov 23 '18 at 18:55
micklmickl
14.2k51638
mickl is it possible to check the key (ex "0" ) is present or not?
– arun thomas
Dec 10 '18 at 14:21
1
@arunthomas sure, you can use $exists operator, like:db.History.find({ "samples": { $elemMatch: { 1: "1535530415" } }, "samples.1": { $exists: true } })
– mickl
Dec 10 '18 at 16:56
in C# code: Builders<BsonDocument>.Filter.Exists("0");
– arun thomas
Dec 18 '18 at 12:30
add a comment |
Your sample document contains an array of arrays. To reference item at index 1 you can take advantage of the fact that in JS an array can be considered as an object where indexes are the properties, so in your case what you're storing can also be interpreted as:
{
"samples": [
{
"0": 25,
"1": "1535530415"
},
{
"0": 45,
"1": "1535530415"
}
]
}
knowing that you can use $elemMatch to reference the right element:
db.History.find({ "samples": { $elemMatch: { 1: "1535530415" } } })
or in C# code:
filterDefintion = Builders<BsonDocument>.Filter.ElemMatch<BsonDocument>("samples", new BsonDocument() { { "1", "1535530415" } });
answered Nov 23 '18 at 18:55
micklmickl
14.2k51638
mickl is it possible to check the key (ex "0" ) is present or not?
– arun thomas
Dec 10 '18 at 14:21
1
@arunthomas sure, you can use $exists operator, like:db.History.find({ "samples": { $elemMatch: { 1: "1535530415" } }, "samples.1": { $exists: true } })
– mickl
Dec 10 '18 at 16:56
in C# code: Builders<BsonDocument>.Filter.Exists("0");
– arun thomas
Dec 18 '18 at 12:30
add a comment |
Your sample document contains an array of arrays. To reference item at index 1 you can take advantage of the fact that in JS an array can be considered as an object where indexes are the properties, so in your case what you're storing can also be interpreted as:
{
"samples": [
{
"0": 25,
"1": "1535530415"
},
{
"0": 45,
"1": "1535530415"
}
]
}
knowing that you can use $elemMatch to reference the right element:
db.History.find({ "samples": { $elemMatch: { 1: "1535530415" } } })
or in C# code:
filterDefintion = Builders<BsonDocument>.Filter.ElemMatch<BsonDocument>("samples", new BsonDocument() { { "1", "1535530415" } });
answered Nov 23 '18 at 18:55
micklmickl
14.2k51638
Your sample document contains an array of arrays. To reference item at index 1 you can take advantage of the fact that in JS an array can be considered as an object where indexes are the properties, so in your case what you're storing can also be interpreted as:
{
"samples": [
{
"0": 25,
"1": "1535530415"
},
{
"0": 45,
"1": "1535530415"
}
]
}
knowing that you can use $elemMatch to reference the right element:
db.History.find({ "samples": { $elemMatch: { 1: "1535530415" } } })
or in C# code:
filterDefintion = Builders<BsonDocument>.Filter.ElemMatch<BsonDocument>("samples", new BsonDocument() { { "1", "1535530415" } });
answered Nov 23 '18 at 18:55
micklmickl
14.2k51638
answered Nov 23 '18 at 18:55
micklmickl
14.2k51638
answered Nov 23 '18 at 18:55
micklmickl
14.2k51638
answered Nov 23 '18 at 18:55
micklmickl
14.2k51638
14.2k51638
mickl is it possible to check the key (ex "0" ) is present or not?
– arun thomas
Dec 10 '18 at 14:21
1
@arunthomas sure, you can use $exists operator, like:db.History.find({ "samples": { $elemMatch: { 1: "1535530415" } }, "samples.1": { $exists: true } })
– mickl
Dec 10 '18 at 16:56
in C# code: Builders<BsonDocument>.Filter.Exists("0");
– arun thomas
Dec 18 '18 at 12:30
add a comment |
mickl is it possible to check the key (ex "0" ) is present or not?
– arun thomas
Dec 10 '18 at 14:21
1
@arunthomas sure, you can use $exists operator, like:db.History.find({ "samples": { $elemMatch: { 1: "1535530415" } }, "samples.1": { $exists: true } })
– mickl
Dec 10 '18 at 16:56
in C# code: Builders<BsonDocument>.Filter.Exists("0");
– arun thomas
Dec 18 '18 at 12:30
mickl is it possible to check the key (ex "0" ) is present or not?
– arun thomas
Dec 10 '18 at 14:21
mickl is it possible to check the key (ex "0" ) is present or not?
– arun thomas
Dec 10 '18 at 14:21
1
1
@arunthomas sure, you can use $exists operator, like:
db.History.find({ "samples": { $elemMatch: { 1: "1535530415" } }, "samples.1": { $exists: true } })– mickl
Dec 10 '18 at 16:56
@arunthomas sure, you can use $exists operator, like:
db.History.find({ "samples": { $elemMatch: { 1: "1535530415" } }, "samples.1": { $exists: true } })– mickl
Dec 10 '18 at 16:56
in C# code: Builders<BsonDocument>.Filter.Exists("0");
– arun thomas
Dec 18 '18 at 12:30
in C# code: Builders<BsonDocument>.Filter.Exists("0");
– arun thomas
Dec 18 '18 at 12:30
add a comment |
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