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));
}
public override IAggregateFluent <TNewResult> BucketAuto <TValue, TNewResult>(
AggregateExpressionDefinition <TResult, TValue> groupBy,
int buckets,
ProjectionDefinition <TResult, TNewResult> output,
AggregateBucketAutoOptions options = null)
{
Ensure.IsNotNull(groupBy, nameof(groupBy));
Ensure.IsGreaterThanZero(buckets, nameof(buckets));
Ensure.IsNotNull(output, nameof(output));
const string operatorName = "$bucketAuto";
var stage = new DelegatedPipelineStageDefinition <TResult, TNewResult>(
operatorName,
(s, sr) =>
{
var newResultSerializer = sr.GetSerializer <TNewResult>();
var renderedGroupBy = groupBy.Render(s, sr);
var renderedOutput = output.Render(s, sr);
var document = new BsonDocument
{
{ operatorName, new BsonDocument
{
{ "groupBy", renderedGroupBy },
{ "buckets", buckets },
{ "output", renderedOutput.Document },
{ "granularity", () => options.Granularity.Value.Value, options != null && options.Granularity.HasValue }
} }
};
return(new RenderedPipelineStageDefinition <TNewResult>(
operatorName,
document,
newResultSerializer));
});
return(AppendStage(stage));
}
