/// <summary>
/// Gets the solr parameters for collapse-expand queries
/// </summary>
/// <param name="options"></param>
/// <returns></returns>
public static IEnumerable <KeyValuePair <string, string> > GetCollapseExpandOptions(CollapseExpandParameters options, Func <ISolrQuery, string> serializer)
{
if (options == null)
{
yield break;
}
var collapseValues = GetCollapseOptions(options).Select(x => x.Key + "=" + x.Value).ToArray();
yield return(KV.Create("fq", "{!collapse " + string.Join(" ", collapseValues) + "}"));
foreach (var kv in GetExpandOptions(options.Expand, serializer))
{
yield return(kv);
}
}
public static IEnumerable <KeyValuePair <string, string> > GetCollapseOptions(CollapseExpandParameters options)
{
if (options == null)
{
throw new ArgumentNullException("options");
}
yield return(KV.Create("field", options.Field));
if (options.NullPolicy != null)
{
yield return(KV.Create("nullPolicy", options.NullPolicy.Policy));
}
if (options.MinOrMaxField != null)
{
yield return(options.MinOrMaxField.Switch <KeyValuePair <string, string> >(
min: x => KV.Create("min", x.Field),
max: x => KV.Create("max", x.Field)));
}
}
