Search Documents

Tigris offers a realtime search for documents in a collection. The fields need to be annotated in order to be indexed. Please check data modeling section. This guide section will walk through how to use Tigris search in different scenarios.

Example collection

Let's first have the collection.

Sync

TigrisCollection<Catalog> catalog = tigrisDatabase.getCollection(Catalog.class);

Async

TigrisAsyncCollection<Catalog> catalog = tigrisDatabase.getCollection(Catalog.class);

Assuming an e-commerce website that has the above collection catalog and has 6 products(documents) in it.

id	name	price	brand	labels	popularity	reviews
1	fiona handbag	99.9	michael kors	purses	8	{"author": "alice", "rating": 7}
2	tote bag	49	coach	handbags	9	{"author": "olivia", "rating": 8.3}
3	sling bag	75	coach	purses	9	{"author": "alice", "rating": 9.2}
4	sneakers shoes	40	adidas	shoes	10	{"author": "olivia", "rating": 9}
5	running shoes	89	nike	shoes	10	{"author": "olivia", "rating": 8.5}
6	running shorts	35	adidas	clothing	7	{"author": "olivia", "rating": 7.5}

Searching for documents

Search consists of executing a query against one or more text fields. Let's perform a simple search query to lookup any items matching "running".

Sync

SearchRequest request = SearchRequest.newBuilder().withQuery("running").build();
Iterator<SearchResult<Catalog>> results = catalog.search(request);

Async

SearchRequest request = SearchRequest.newBuilder().withQuery("running").build();

catalog.search(
    request,
    new TigrisAsyncSearchReader<Catalog>() {
        @Override
        public void onNext(SearchResult<Catalog> result) {
            // receive search results
        }

        @Override
        public void onError(Throwable t){
            // handle terminating error
        }

        @Override
        public void onCompleted() {
            // successfully delivered all results
        }
    }
);

info

Search is case insensitive i.e. a search for term "ruNninG" would match all of ["Running", "running", "RUnnIng", "RUNNING"] etc.

Phrase search

By default, search is performed over individual terms in the text. For example, search for a query string adventure park in a dataset would yield following results:

1. "California's kids adventure park and Safari"
2. "Adventure island and water park"
3. "Long Island water park and adventure activities"
4. "Six flags kids recreation and adventure park"
5. "Hollywood adventure park and studios"
6. "Seaworld adventure and theme park"

The search phrase can be escaped in query for exact match. In the above example, querying for exact phrase \"adventure park\" would return:

1. "California's kids adventure park and Safari"
2. "Six flags kids recreation and adventure park"
3. "The Great America adventure park and Zoo"

Phrases can still be combined with keywords for richer text search. Continuing above example, the query string kids \"adventure park\" would result in:

1. "California's kids adventure park and Safari"
2. "Six flags kids recreation and adventure park"

SearchRequest request = SearchRequest.newBuilder().withQuery("\"adventure park\"").build();

SearchRequest request = SearchRequest.newBuilder().withQuery("kids \"adventure park\"").build();

Match all search query

When query string isn't specified or an empty string (""), a match all query is performed. It returns all searchable documents, modified by any filters or search parameters used.

SearchRequest request = SearchRequest.matchAll().build();

tip

Returning all documents is typically useful when used in conjunction with filter, or when performing a faceted search across the collection.

Project search query against specific fields

We can optionally project the search query against selected fields. Continuing previous example of searching for "running", we may not want to search in reviews field and avoid any unwanted results.

SearchRequest request =
    SearchRequest.newBuilder()
        .withQuery("running")
        .withSearchFields("name", "labels")
        .build();

Refine the search results using filters

Applying filter on search results

Filters can be used to match against one or more field values in a collection. For example, to fetch all items from brand "adidas".

SearchRequest request =
    SearchRequest.matchAll()
        .withFilter(Filters.eq("brand", "adidas"))
        .build();

Applying complex filter on search results

Let's adjust the query to only return items in price range of [40, 90). We can use filters in search to further refine the results.

SearchRequest request =
    SearchRequest.newBuilder()
        .withQuery("running")
        .withSearchFields("name", "labels")
        .withFilter(
            Filters.and(
                Filters.eq("price", 40), Filters.eq("price", 90)))
        .build();

Supported filter operators

The following filter operators are supported:

• $eq - Matches documents where the field value is equal to the provided value.

• $lt - Matches documents where the field value is less than the provided value.

• $lte - Matches documents where the field value is less than or equal to the provided value.

• $gt - Matches documents where the field value is greater than the provided value.

• $gte - Matches documents where the field value is greater than or equal to the provided value.

• $not - Matches documents where the field value is not equal to the provided value.

• $contains - Matches documents where the the provided value is a substring of the field value.

• $regexp - Matches documents where the field value matches the given regex.

• $and - Matches documents where all of the provided filters match.

• $or - Matches documents where at least one of the provided filters match.

Faceted search

We can additionally retrieve the number of items a particular brand has and unique labels, that match our search query.

SearchRequest request =
    SearchRequest.newBuilder()
        .withQuery("running")
        .withSearchFields("name", "labels")
        .withFilter(
            Filters.and(
                Filters.gte("price", 40), Filters.lt("price", 90)))
        .withFacetFields("brand", "labels")
        .build();

Facets are a specific use-case of filters, and can only be used for filterable attributes.

Faceted content navigation UI

Common application for faceted search is to build UX with quick filters, that users can use to narrow search results in real-time. Faceted search interface presents intuitive content navigation to the end user.

Sorting the search results

Tigris lets you specify an order to sort the search results. We can specify a ranking order in our search query to have results sorted with more popular items appearing first.

SearchRequest request =
    SearchRequest.newBuilder()
        .withQuery("running")
        .withSearchFields("name", "labels")
        .withSort(Sort.descending("popularity"))
        .build();

Many documents may have the same popularity score, we can specify additional user-defined sortable field to break the tie.

SearchRequest request =
    SearchRequest.newBuilder()
        .withQuery("running")
        .withSearchFields("name", "labels")
        .withSort(Sort.descending("popularity"), Sort.descending("reviews.rating"))
        .build();

The results will be first sorted by value of popularity field, reviews.rating will be used to decide ordering if two matching documents have same popularity.

note

Documents can only be sorted by integer, number and date-time type of collection fields.

Specifying document fields to retrieve

Search query can be programmed to return only specific fields in a document in search results. We may only need to retrieve product name, brand and price for our interface.

SearchRequest request =
    SearchRequest.newBuilder()
        .withQuery("running")
        .withIncludeFields("name", "brand", "price")
        .build();

On the contrary, exclusion of fields is useful to exclude/hide potentially sensitive fields or internal metadata from the document. To include all fields except id and reviews from documents in search results.

SearchRequest request =
    SearchRequest.newBuilder()
        .withQuery("running")
        .withExcludeFields("id", "reviews")
        .build();

note

Field selection does not impact searching, filtering and faceting capabilities for that field. For example, if reviews field is not included in documents in search results, it could still be used for text querying, filtering and/or faceting; just that matched documents won't include reviews field.

Case Insensitive Search Result Filtering

Search is case-insensitive but the filtering to restrict the search result is case-sensitive by default. Tigris supports Collation which allows you to specify string comparison rules for filtering on text fields. Set the case to ci in the collation object to make it case-insensitive. The following example is showing when you are searching for text "running" and you need to filter by brand field, but you don't care about the case.

Paginating through search results

Using page numbers

To retrieve a page of results, you can simply use Search method with page number and page size. Following query fetches the first page of results with page size set as 10

Details

Output

The hitsPerPage parameter controls the number of documents to include in a result page. The returned array of documents is accessible under hits key along with some search metadata.

Details

Output

Additionally, search result contains metadata object having current page and total pages along with other information.

Details

Output

Infinite scrolling

Infinite scrolling also loads data in pages, it is just that the UX is more fluid. Instead of using page number, an Iterator object can be obtained from search method call and processed iteratively.

Details

Output

As you can see, the iterator returns the same SearchResult object as in previous section with pagination metadata.