public void PipelineStageDefinitionBuilder_Group_with_expressions_should_throw_with_LINQ3()
{
var stageDefinition = PipelineStageDefinitionBuilder.Group((BsonDocument x) => 1, x => new { Count = x.Count() });
var exception = Record.Exception(() => Linq3TestHelpers.Render(stageDefinition, BsonDocumentSerializer.Instance, LinqProvider.V3));
exception.Should().BeOfType <InvalidOperationException>();
}
public void PipelineStageDefinitionBuilder_Group_with_expressions_should_work_with_LINQ2()
{
var stageDefinition = PipelineStageDefinitionBuilder.Group((BsonDocument x) => 1, x => new { Count = x.Count() });
var stage = Linq3TestHelpers.Render(stageDefinition, BsonDocumentSerializer.Instance, LinqProvider.V2);
var expectedStages = new[]
{
"{ $group : { _id : 1, Count : { $sum : 1 } } }"
};
Linq3TestHelpers.AssertStages(new[] { stage }, expectedStages);
}
public void PipelineStageDefinitionBuilder_Group_with_projection_to_TOutput_should_work(
[Values(LinqProvider.V2, LinqProvider.V3)] LinqProvider linqProvider)
{
var stageDefinition = PipelineStageDefinitionBuilder.Group <BsonDocument, BsonDocument>("{ _id : 1, Count : { $sum : 1 } }");
var stage = Linq3TestHelpers.Render(stageDefinition, BsonDocumentSerializer.Instance, linqProvider);
var expectedStages = new[]
{
"{ $group : { _id : 1, Count : { $sum : 1 } } }"
};
Linq3TestHelpers.AssertStages(new[] { stage }, expectedStages);
}
/// <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));
}
}
/// <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));
return(aggregate.AppendStage(PipelineStageDefinitionBuilder.Group(id, group)));
}
/// <summary>
/// Appends a group stage to the pipeline.
/// </summary>
/// <typeparam name="TResult">The type of the result.</typeparam>
/// <param name="aggregate">The aggregate.</param>
/// <param name="group">The group projection.</param>
/// <returns>
/// The fluent aggregate interface.
/// </returns>
public static IAggregateFluent <BsonDocument> Group <TResult>(this IAggregateFluent <TResult> aggregate, ProjectionDefinition <TResult, BsonDocument> group)
{
Ensure.IsNotNull(aggregate, nameof(aggregate));
return(aggregate.AppendStage(PipelineStageDefinitionBuilder.Group(group)));
}
