public static IQueryable <T> AddKeywordSearchQuery <T>(this IProviderSearchContext context, IQueryable <T> query, string searchTargetId, ICollection <string> keywords, KeywordSearchOptions options = null) where T : SearchResultItem
{
Assert.ArgumentNotNull(query, nameof(query));
Assert.ArgumentNotNull(context, nameof(context));
Assert.ArgumentNotNullOrEmpty(searchTargetId, nameof(searchTargetId));
Assert.ArgumentNotNull(keywords, nameof(keywords));
if (!keywords.Any())
{
return(query);
}
var config = Factory.CreateObject("kotoha/configuration", true) as KeywordSearchConfiguration;
var searchTarget = config.GetSearchTargetById(searchTargetId);
if (searchTarget == null)
{
throw new InvalidOperationException($"Keyword search target was not found. (ID: {searchTargetId})");
}
var contentField = context.Index.Configuration.DocumentOptions.ComputedIndexFields
.OfType <KeywordSearchContentIndexField>()
.FirstOrDefault(field => field.SearchTargetId == searchTargetId);
if (contentField == null)
{
throw new InvalidOperationException($"Keyword search content field was not found. (ID: {searchTargetId})");
}
var condition = options?.Condition ?? config.DefaultKeywordSearchOptions?.Condition ?? default;
var searchType = options?.SearchType ?? config.DefaultKeywordSearchOptions?.SearchType ?? default;
var generateFilterPred = CreatePredicateGenerator <T>(condition, searchType);
var generateBoostPred = CreatePredicateGenerator <T>(condition, SearchType.Or); // Boost predicate must use OR operator
// predicate for filtering
var filterPred = keywords
.Aggregate(
PredicateBuilder.True <T>(),
(acc, keyword) => generateFilterPred(acc, contentField.FieldName, keyword, 0));
// predicate for boosting
var boostPred = searchTarget.Fields
.Where(field => field.Boost > 0.0f)
.SelectMany(_ => keywords, (field, keyword) => (field, keyword))
.Aggregate(
PredicateBuilder.Create <T>(item => item.Name.MatchWildcard("*").Boost(0)), // always true
(acc, pair) => generateBoostPred(acc, pair.field.Name, pair.keyword, pair.field.Boost));
return(query.Filter(filterPred).Where(boostPred));
}
public static IQueryable <T> CreateKeywordSearchQuery <T>(this IProviderSearchContext context, string searchTargetId, ICollection <string> keywords, KeywordSearchOptions options = null) where T : SearchResultItem
{
Assert.ArgumentNotNull(context, nameof(context));
Assert.ArgumentNotNullOrEmpty(searchTargetId, nameof(searchTargetId));
Assert.ArgumentNotNull(keywords, nameof(keywords));
var query = context.GetQueryable <T>();
return(context.AddKeywordSearchQuery(query, searchTargetId, keywords, options));
}
