eZ Platform exposes a very powerful Search API, allowing both full-text search and querying the content Repository using several built-in Search Criteria and Sort Clauses. These are supported across different search engines, allowing you to plug in another search engine without changing your code.
Currently two search engines exist in their own eZ Platform Bundles:
- Legacy search engine, a database-powered search engine for basic needs.
- Solr, an integration providing better overall performance, much better scalability and support for more advanced search capabilities (recommended)
Search Criteria and Sort Clauses¶
Search Criteria and Sort Clauses are value object classes used for building a search query, to define filter criteria and ordering of the result set. eZ Platform provides a number of standard Search Criteria and Sort Clauses that you can use out of the box and that should cover the majority of use cases.
For an example of how to use and combine Criteria and Sort Clauses, refer to Searching in PHP API.
Search engine handling of Search Criteria and Sort Clauses¶
As Search Criteria and Sort Clauses are value objects which are used to define the query from API perspective, they are common for all storage engines. Each storage engine needs to implement its own handlers for the corresponding Criterion and Sort Clause value object, which will be used to translate the value object into a storage-specific search query.
Search Facet reference¶
Search Facets enable you to apply faceted search to get a count of search results for each Facet value.
OWNER = 'owner',
GROUP = 'group',
MODIFIER = 'modifier']
Custom Criteria and Sort Clauses¶
Sometimes you will find that standard Search Criteria and Sort Clauses provided with eZ Platform are not sufficient for your needs. Most often this will be the case if you have a custom Field Type using external storage which cannot be searched using the standard Field Criterion.
Legacy (SQL-based) search can also be used in
ezkeyword external storage.
In such cases you can implement a custom Criterion or Sort Clause, together with the corresponding handlers for the storage engine you are using.
Using Field Criterion or Sort Clause with large databases
Field Criterion and Sort Clause do not perform well by design when using SQL database. If you have a large database and want to use them, you either need to use the Solr search engine, or develop your own Custom Criterion or Sort Clause. This way you can avoid using the attributes (Fields) database table, and instead use a custom simplified table which can handle the amount of data you have.
Difference between Content and Location Search¶
There are two basic types of searches, you can either search for Locations or for Content. Each type has dedicated methods in the Search Service:
|Type of search||Method in Search Service|
All Criteria and Sort Clauses will be accepted with Location Search, but not all of them can be used with Content Search. The reason for this is that while one Location always has exactly one Content item, one Content item can have multiple Locations. In this context some Criteria and Sort Clauses would produce ambiguous queries that would not be accepted by Content Search.
Content Search explicitly refuses to accept Criteria and Sort Clauses implementing these abstract classes:
How to configure your own Criterion and Sort Clause Handlers¶
After you have implemented your Criterion / Sort Clause and its handler, you will need to configure the handler for the service container using dedicated service tags for each type of search. Doing so will automatically register it and handle your Criterion / Search Clause when it is given as a parameter to one of the Search Service methods.
Available tags for Criterion handlers in Legacy Storage Engine are:
Available tags for Sort Clause handlers in Legacy Storage Engine are:
You will find all the native handlers and the tags for the Legacy Storage Engine in files located in
Example of registering a ContentId Criterion handler, common for both Content and Location Search¶
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Example of registering a Depth Sort Clause handler for Location Search¶
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See also Symfony documentation about Service Container for passing parameters.
Search using custom Field Criterion [REST]¶
REST search can be performed via
POST /views using custom
FieldCriterion. This allows you to build custom content logic queries with nested logical operators OR/AND/NOT.
Custom Field Criterion search mirrors the one already existing in PHP API
eZ\Publish\API\Repository\Values\Content\Query\Criterion\Field by exposing it to REST.
Example of custom Content Query:¶
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To (re)create or refresh the search engine index for configured search engines (per SiteAccess repository), use the
php bin/console ezplatform:reindex command.
Some examples of common usage:
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For further info on possible options, see
php bin/console ezplatform:reindex --help.