public void Where(Expression <Func <TSource, bool> > predicate)
{
MethodCallExpression whereExpression = predicate.WrapInWhereExpression();
var jsonSelector = _queryProvider.ToString(whereExpression);
_partialSelector = jsonSelector
.Substring(1, jsonSelector.Length - 2)
.Replace("selector", "partial_filter_selector", StringComparison.CurrentCultureIgnoreCase);
}
public static async Task <ChangesFeedResponse <TSource> > QueryWithFilterAsync <TSource>(this IFlurlRequest request, IAsyncQueryProvider queryProvider, ChangesFeedFilter filter,
CancellationToken cancellationToken)
where TSource : CouchDocument
{
if (filter is DocumentIdsChangesFeedFilter documentIdsFilter)
{
return(await request
.SetQueryParam("filter", "_doc_ids")
.PostJsonAsync(new ChangesFeedFilterDocuments(documentIdsFilter.Value), cancellationToken)
.ReceiveJson <ChangesFeedResponse <TSource> >()
.ConfigureAwait(false));
}
if (filter is SelectorChangesFeedFilter <TSource> selectorFilter)
{
MethodCallExpression whereExpression = selectorFilter.Value.WrapInWhereExpression();
var jsonSelector = queryProvider.ToString(whereExpression);
return(await request
.WithHeader("Content-Type", "application/json")
.SetQueryParam("filter", "_selector")
.PostStringAsync(jsonSelector, cancellationToken)
.ReceiveJson <ChangesFeedResponse <TSource> >()
.ConfigureAwait(false));
}
if (filter is DesignChangesFeedFilter)
{
return(await request
.SetQueryParam("filter", "_design")
.GetJsonAsync <ChangesFeedResponse <TSource> >(cancellationToken)
.ConfigureAwait(false));
}
if (filter is ViewChangesFeedFilter viewFilter)
{
return(await request
.SetQueryParam("filter", "_view")
.SetQueryParam("view", viewFilter.Value)
.GetJsonAsync <ChangesFeedResponse <TSource> >(cancellationToken)
.ConfigureAwait(false));
}
throw new InvalidOperationException($"Filter of type {filter.GetType().Name} not supported.");
}
public override string ToString()
{
return(_queryProvider.ToString(_expression));
}
