I am trying to get a specific value from a Bson document using an IQueryable object. I have a method that is reading a json structure as shown below.
"SimulatedData": [
{
"value": 1819.00923045901,
"units": "hp",
"tag": "comp/totalIhp",
"name": "Compressor - Total IHP"
},
{
"value": 789.294125,
"units": "RPM",
"tag": "comp/averageSpeed",
"name": "Compressor - Speed"
},
{
"value": 2064.74658240481,
"units": "hp",
"tag": "comp/totalBhp",
"name": "Compressor - Total BHP"
}
]
I am reading this JSON, getting the 'tag' key value and then looking for this tag value in a collection in MongoDB.
try
{
string jsonFromFile;
using (var reader = new StreamReader(path))
{
jsonFromFile = reader.ReadToEnd();
}
var simulatedData = Newtonsoft.Json.JsonConvert.DeserializeObject<dynamic>(jsonFromFile);
foreach (var channel in simulatedData.SimulatedData)
{
var tag = channel.tag;
var master = DBConnect.CosmosClient.GetCollection<MasterVariables>("MasterVariables");
var channelId = master.AsQueryable().Where(x => x.Tag == $"{tag}");
foreach(var c in channelId)
{
string id = c.ChannelID;
Console.WriteLine(id);
}
}
}
The value of the 'tag' key will be used to search in MasterVariables for a match. The document in MasterVariables that matches the value of the 'tag' key will result in a JSON/bson as below.I have a class that take in these values and sets them to class attributes
{
"Tag" : "comp/idealTotalSucCapacity",
"Group" : "{ id : \"comp\", parent : \"#\", text : \"Compressor\" }",
"Series" : "Compressor",
"Enabled" : true,
"ChannelID" : "C8",
"productType" : "Spotlight_Comp",
"database" : "compdata"
}
MasterVariables class (below)
public class MasterVariables
{
public string Tag { get; set; }
public string Group { get; set; }
public string Series { get; set; }
public bool Enabled { get; set; }
public string ChannelID { get; set; }
public string productType { get; set; }
public string database { get; set; }
}
My main issue is that I am not able to get the "ChannelID" value using c.ChannelID . My code compiles and doesn't give me any errors. But I am very confused as to why I am not able to get the channelID value using an Iqueryable object. I know the below foreach isn't correct since I will only be receiving 1 Bson document that matches the 'tag' value. But I haven't found anything helpful about a different way to get the ChannelId. Any thoughts on what I am doing wrong here? Or is there a different approach?
foreach(var c in channelId)
{
string id = c.ChannelID;
Console.WriteLine(id);
}
Related
I have two tables, which have following foreign key
Poll(CreatedBy) --> CreateBy(ID)
On performing join, I am getting data as following:
I want to write an query using EF (if possible) to return result as:
[{
"id": 1,
"users": [
{
"email": "abc.com"
}
]
},
{
"id": 3,
"users": [
{
"email": "xyz.test"
},
{
"email": "tet.com"
}
]
}]
Assuming that the class structure like below:
public class Poll
{
public int ID { get; set; }
public string Name { get; set; }
public List<CreateBy> CreateBy { get; set; }
}
public class CreateBy
{
public int ID { get; set; }
public string EmailAddress { get; set; }
public string DisplayName { get; set; }
[ForeignKey("Poll")]
public int PollId { get; set; }
}
Data source:
Linq query:
var result = (from p in _context.Poll.ToList()
join c in _context.CreateBy on p.ID equals c.PollId
group p by p.ID into g
select new
{
id = g.Key,
users = g.Select(x => x.CreateBy.Where(z => z.PollId == g.Key).Select(y => new { email = y.EmailAddress })).FirstOrDefault()
}).ToList();
Result:
Ok so my json return string looks like this:
{
"categories": [
{
"id": "1",
"category": "cat-1"
},
{
"id": "2",
"category": "cat-2"
},
{
"id": "3",
"category": "cat-3"
}
]
}
This list of returned categories is going to be used as a dropdown in my bootstrap nav menu so I would like to use the least amount of calls as possible as it will likely not change often enough to have to all it during each page refresh if I don't have to.
How would I write out my Model/ViewModel to bind to this string? I would then like to use something like this to return a list of CategoryViewModel from which I can iterate through.
public async Task<IEnumerable<CategoryViewModel>> GetCategoryList () {
HttpResponseMessage response = await httpClient.GetAsync ("/categories");
response.EnsureSuccessStatusCode ();
var result = await response.Content
.ReadAsAsync<IEnumerable<CategoryViewModel>> ();
return result;
}
The JSON model you have requires a container class, for example:
public class CategoryViewModelContainer
{
public IEnumerable<CategoryViewModel> Categories { get; set; }
}
//Assuming your category view model looks like this:
public class CategoryViewModel
{
public int Id { get; set; }
public string Category { get; set; }
}
And you use it like this:
var result = await response.Content.ReadAsAsync<CategoryViewModelContainer>();
Now you can loop through the categories:
foreach(var categoryModel in result.Categories)
{
var categoryName = categoryModel.Category;
}
I have a little bit problem with an data update in mongoDB. I have an array embedded in an other array who is embedded in a document (yaaaaay ^^). So my collection is like that :
{
"_id" : ObjectId("5965e0b4f1042c4c3f1d8edc"),
"Builder" : "Google",
"Family" : "Car",
"ProductName" : "ABCD_80A_PU170017",
"ProductNumber" : "N 1",
"Test" : [
{
"Num_Test" : "PU170017",
"Date_Start" : ISODate("2017-07-12T00:00:00.000Z"),
"Bench": [
{
"Room": 1,
"Num" : 1,
"Designation" : "AC1; AC3",
"IP" : "123.456.78.9",
"Capacity" : 12,
}
],
"User" : [
{
"Number" : "EBBW396",
"Password" : "titi",
"Name" : "NDJO",
"Surname" : "Charles",
"Tel" : "06XXXXXX",
"isAdmin" : true
}
]
}
]
}
And i want to insert a new array embedded in "Test".
So i found my happiness here : https://docs.mongodb.com/getting-started/csharp/update/ AND How to use C# to insert document into existing embedded documents?
And i have write this code :
static void Main(string[] args)
{
IMongoClient client = new MongoClient("mongodb://10.194.157.199:27017");
IMongoDatabase database = client.GetDatabase("PINEA");
IMongoCollection<Product> collection = database.GetCollection<Product>("Product");
var filter = Builders<Product>.Filter.Eq("Test.Num_Test", "PU170017");
var meter = new Meter();
meter.Value= 12;
meter.Date = DateTime.Now;
var meterList = new List<Meter>();
meterList.Add(meter);
var update = Builders<Product>.Update.Push("Result", new Result
{
MeterList = meterList
});
var result = collection.UpdateOne(filter, update);
}
But nothing happens, nothing has added or modified. I miss something important but i don't understand what is it.
Finally, here are my classes:
class Result
{
public List<Meter> MeterList { get; set; }
public List<Problem> Problem { get; set; }
}
class Meter
{
public int? Value { get; set; }
public DateTime? Date { get; set; }
}
class Test
{
public string Num_Test { get; set; }
public DateTime? Date_Start { get; set; }
public List<Bench> Bench { get; set; }
public List<User> User { get; set; }
public List<Result> Result { get; set; }
}
class Product
{
public string Builder { get; set; }
public string Fammily { get; set; }
public string ProductName { get; set; }
public string ProductNumber { get; set; }
public List<Test> Test { get; set; }
}
To explain the context, I need to update the array "result" regularly and maintain data arborescence like that. After the end of the test, data aren't modify anymore.
PS : I'm still a student but I work part time
Thanks
In a MongoDB I have a collection with documents with this structure:
{
"_id" : 18,
"name" : "Verdell Sowinski",
"scores" : [
{
"type" : "exam",
"score" : 62.12870233109035
},
{
"type" : "quiz",
"score" : 84.74586220889356
},
{
"type" : "homework",
"score" : 81.58947824932574
},
{
"type" : "homework",
"score" : 69.09840625499065
}
]
}
I am using .NET. I need to remove the scores array element with the lowest scores.score for all the documents with scores.type="homework".
In the example would be the 4th element of the scores array ("score" : 69.09840625499065).
I suposse I have to group by Id, sort limiting to 1 and then use the method DeleteMany but I can´t get the code work
I can`t solve the problem. The code I´m trying and don't work is the next one:
var db = client.GetDatabase("school");
var col = db.GetCollection<Student>("students");
var filter = new BsonDocument("scores.type", "homework");
var myresult = await col
//.Find(filter)
.Aggregate()
.Unwind(x => x.Scores)
.Group(new BsonDocument { { "_id", "$_id" },
{ "minimo", new BsonDocument("$min", "$Scores.score") } })
.Sort(new BsonDocument("minimo", -1))
.Limit(1)
.ToListAsync();
My classes:
public class Student
{
public int _id { get; set; }
public string Name { get; set; }
public List<Score> Scores { get; set; }
}
public class Score
{
public string Type { get; set; }
public double Mark { get; set; }
}
In my entity class i use enum as a key property:
[DataContract]
public class MultimediaType
{
[DataMember]
[Key]
public Identificator Id { get; set; }
[DataMember]
public string Name { get; set; }
[DataMember]
public string Description { get; set; }
[DataContract]
public enum Identificator
{
[EnumMember]
Image = 1,
[EnumMember]
Video = 2,
[EnumMember]
Sound = 3
}
}
[EnableClientAccess()]
public class DomService : DomainService
{
List<MultimediaType> _multimediaTypes = new List<MultimediaType>()
{
new MultimediaType()
{
Id = MultimediaType.Identificator.Image,
Name = "Image",
Description = "This is type for all images."
},
new MultimediaType()
{
Id = MultimediaType.Identificator.Video,
Name = "Video",
Description = "This is type for all videos."
},
new MultimediaType()
{
Id = MultimediaType.Identificator.Sound,
Name = "Sound",
Description = "This is type for all sounds."
},
};
[Query]
public IQueryable<MultimediaType> GetMultimediaTypes()
{
return _multimediaTypes.AsQueryable();
}
}
My client is SilverLight application that consume my domain service.
I have no idea what is wrong, but i obtaint this error:
The property 'MultimediaType.Id' is marked as a key property, but it's not serializable. Are you missing DataMemberAttribute?
Do you have any idea what i do wrong? Thanks a lot!
EnumMemberAttribute : Specifies that the field is an enumeration member and should be serialized.
Check the below lins :
http://msdn.microsoft.com/en-us/library/system.runtime.serialization.enummemberattribute(v=vs.95).aspx
Sharing Enum with WCF Service
Also take a look at the Remarks and Example