public void PipelineStageDefinitionBuilder_GroupForLinq3_with_expressions_should_throw_with_LINQ2()
{
var(groupStageDefinition, projectStageDefinition) = PipelineStageDefinitionBuilder.GroupForLinq3((BsonDocument x) => 1, x => new { Count = x.Count() });
var exception = Record.Exception(() => Linq3TestHelpers.Render(groupStageDefinition, BsonDocumentSerializer.Instance, LinqProvider.V2));
exception.Should().BeOfType <InvalidOperationException>();
}
/// <summary>
/// Appends a group stage to the pipeline.
/// </summary>
/// <typeparam name="TResult">The type of the result.</typeparam>
/// <typeparam name="TKey">The type of the key.</typeparam>
/// <typeparam name="TNewResult">The type of the new result.</typeparam>
/// <param name="aggregate">The aggregate.</param>
/// <param name="id">The id.</param>
/// <param name="group">The group projection.</param>
/// <returns>
/// The fluent aggregate interface.
/// </returns>
public static IAggregateFluent <TNewResult> Group <TResult, TKey, TNewResult>(this IAggregateFluent <TResult> aggregate, Expression <Func <TResult, TKey> > id, Expression <Func <IGrouping <TKey, TResult>, TNewResult> > group)
{
Ensure.IsNotNull(aggregate, nameof(aggregate));
if (aggregate.Database.Client.Settings.LinqProvider == LinqProvider.V2)
{
return(aggregate.AppendStage(PipelineStageDefinitionBuilder.Group(id, group)));
}
else
{
var(groupStage, projectStage) = PipelineStageDefinitionBuilder.GroupForLinq3(id, group);
return(aggregate.AppendStage(groupStage).AppendStage(projectStage));
}
}
public void PipelineStageDefinitionBuilderGroupForLinq3_with_expressions_should_work_with_LINQ3()
{
var(groupStageDefinition, projectStageDefinition) = PipelineStageDefinitionBuilder.GroupForLinq3((BsonDocument x) => 1, x => new { Count = x.Count() });
var groupStage = Linq3TestHelpers.Render(groupStageDefinition, BsonDocumentSerializer.Instance, LinqProvider.V3);
var groupingSerializer = new IGroupingSerializer <int, BsonDocument>(new Int32Serializer(), BsonDocumentSerializer.Instance);
var projectStage = Linq3TestHelpers.Render(projectStageDefinition, groupingSerializer, LinqProvider.V3);
var expectedStages = new[]
{
"{ $group : { _id : 1, __agg0 : { $sum : 1 } } }",
"{ $project : { Count : '$__agg0', _id : 0 } }"
};
Linq3TestHelpers.AssertStages(new[] { groupStage, projectStage }, expectedStages);
}
