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  1. C# Driver
  2. CSHARP-2509

Support Dictionary.ContainsValue in LINQ queries

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    • Type: Icon: New Feature New Feature
    • Resolution: Done
    • Priority: Icon: Major - P3 Major - P3
    • 2.26.0
    • Affects Version/s: None
    • Component/s: Linq, LINQ3
    • Fully Compatible
    • Not Needed
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      1. What would you like to communicate to the user about this feature?
      2. Would you like the user to see examples of the syntax and/or executable code and its output?
      3. Which versions of the driver/connector does this apply to?

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      1. What would you like to communicate to the user about this feature? 2. Would you like the user to see examples of the syntax and/or executable code and its output? 3. Which versions of the driver/connector does this apply to?

      Tested using version 2.7.3 of the C# driver.

      Issue appears to be in MongoDB.Driver.Linq.Translators.PredicateTranslator.Translate. 

      Given the following document:

      {
    "_id" : ObjectId("5c5c8d915018e66f49cf8b59"),
    "UserAttributes" : {
        "CustomerClass" : "Schools",
        "CustomerSubClass" : "Law Schools"
    },
    "UserId" : "urn:idprofile:PA10000"
}

       

      this code will fail:

      public class User
{
 public ObjectId _id;
 public string UserId { get; set; }
public Dictionary<string, string> UserAttributes = new Dictionary<string, string>();
}
var uri = "xxx";
var mongoURL = new MongoUrl(uri);
var client = new MongoClient(mongoURL);
var database = client.GetDatabase("csharp");
var Users = database.GetCollection<User>("Users");
int count = Users.AsQueryable().Where(x => x.UserAttributes.ContainsValue("Law Schools")).Count();

       

      The error that is produced:

      System.ArgumentException HResult=0x80070057 Message=Unsupported filter: \{document}{UserAttributes}.ContainsValue("Law Schools"). Source=MongoDB.Driver StackTrace: at MongoDB.Driver.Linq.Translators.PredicateTranslator.Translate(Expression node) at MongoDB.Driver.Linq.Translators.PredicateTranslator.Translate(Expression node, IBsonSerializerRegistry serializerRegistry) at MongoDB.Driver.Linq.Translators.QueryableTranslator.TranslateWhere(WhereExpression node) at MongoDB.Driver.Linq.Translators.QueryableTranslator.Translate(Expression node) at MongoDB.Driver.Linq.Translators.QueryableTranslator.TranslateGroupBy(GroupByExpression node) at MongoDB.Driver.Linq.Translators.QueryableTranslator.Translate(Expression node) at MongoDB.Driver.Linq.Translators.QueryableTranslator.TranslatePipeline(PipelineExpression node) at MongoDB.Driver.Linq.Translators.QueryableTranslator.Translate(Expression node) at MongoDB.Driver.Linq.Translators.QueryableTranslator.Translate(Expression node, IBsonSerializerRegistry serializerRegistry, ExpressionTranslationOptions translationOptions) at MongoDB.Driver.Linq.MongoQueryProviderImpl`1.Translate(Expression expression) at MongoDB.Driver.Linq.MongoQueryProviderImpl`1.Execute(Expression expression) at MongoDB.Driver.Linq.MongoQueryProviderImpl`1.Execute[TResult](Expression expression) at System.Linq.Queryable.Count[TSource](IQueryable`1 source) at ConsoleApp1.Program.Test2() in C:\Workspace\ConsoleApp1\ConsoleApp1\Program.cs:line 77 at ConsoleApp1.Program.Main(String[] args) in C:\Workspace\ConsoleApp1\ConsoleApp1\Program.cs:line 31

            Assignee:
            robert@mongodb.com Robert Stam
            Reporter:
            alex.bevilacqua@mongodb.com Alex Bevilacqua
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              Created:
              Updated:
              Resolved: