public override IAggregateFluent <TNewResult> Unwind <TNewResult>(FieldDefinition <TResult> field, AggregateUnwindOptions <TNewResult> options)
{
return(WithPipeline(_pipeline.Unwind(field, options)));
}
public override IAggregateFluent <TNewResult> Unwind <TNewResult>(FieldDefinition <TResult> field, AggregateUnwindOptions <TNewResult> options)
{
options = options ?? new AggregateUnwindOptions <TNewResult>();
const string operatorName = "$unwind";
var stage = new DelegatedPipelineStageDefinition <TResult, TNewResult>(
operatorName,
(s, sr) =>
{
var newResultSerializer = options.ResultSerializer ?? (s as IBsonSerializer <TNewResult>) ?? sr.GetSerializer <TNewResult>();
var fieldName = "$" + field.Render(s, sr).FieldName;
string includeArrayIndexFieldName = null;
if (options.IncludeArrayIndex != null)
{
includeArrayIndexFieldName = options.IncludeArrayIndex.Render(newResultSerializer, sr).FieldName;
}
BsonValue value = fieldName;
if (options.PreserveNullAndEmptyArrays.HasValue || includeArrayIndexFieldName != null)
{
value = new BsonDocument
{
{ "path", fieldName },
{ "preserveNullAndEmptyArrays", options.PreserveNullAndEmptyArrays, options.PreserveNullAndEmptyArrays.HasValue },
{ "includeArrayIndex", includeArrayIndexFieldName, includeArrayIndexFieldName != null }
};
}
return(new RenderedPipelineStageDefinition <TNewResult>(
operatorName,
new BsonDocument(operatorName, value),
newResultSerializer));
});
return(AppendStage <TNewResult>(stage));
}
/// <summary>
/// Appends an unwind stage to the pipeline.
/// </summary>
/// <typeparam name="TResult">The type of the result.</typeparam>
/// <typeparam name="TNewResult">The type of the new result.</typeparam>
/// <param name="aggregate">The aggregate.</param>
/// <param name="field">The field to unwind.</param>
/// <param name="options">The options.</param>
/// <returns>
/// The fluent aggregate interface.
/// </returns>
public static IAggregateFluent <TNewResult> Unwind <TResult, TNewResult>(this IAggregateFluent <TResult> aggregate, Expression <Func <TResult, object> > field, AggregateUnwindOptions <TNewResult> options = null)
{
Ensure.IsNotNull(aggregate, nameof(aggregate));
return(aggregate.AppendStage(PipelineStageDefinitionBuilder.Unwind(field, options)));
}
/// <inheritdoc />
public virtual IAggregateFluent <TNewResult> Unwind <TNewResult>(FieldDefinition <TResult> field, AggregateUnwindOptions <TNewResult> options)
{
throw new NotImplementedException();
}
/// <summary>
/// Appends an unwind stage to the pipeline.
/// </summary>
/// <typeparam name="TResult">The type of the result.</typeparam>
/// <typeparam name="TNewResult">The type of the new result.</typeparam>
/// <param name="aggregate">The aggregate.</param>
/// <param name="field">The field to unwind.</param>
/// <param name="options">The options.</param>
/// <returns>
/// The fluent aggregate interface.
/// </returns>
public static IAggregateFluent <TNewResult> Unwind <TResult, TNewResult>(this IAggregateFluent <TResult> aggregate, Expression <Func <TResult, object> > field, AggregateUnwindOptions <TNewResult> options = null)
{
Ensure.IsNotNull(aggregate, nameof(aggregate));
Ensure.IsNotNull(field, nameof(field));
return(aggregate.Unwind(
new ExpressionFieldDefinition <TResult>(field),
options));
}
