Creating a standard query filter

A standard query filter represents a named query predicate that you can add to a query builder result object. You create a standard query filter by instantiating a new StandardQueryFilter object. The gw.api.filters package contains the StandardQueryFilter class. Its constructor takes two arguments:

• Name – A String to use as an identifier for the filter.
• Predicate – A Gosu block with a query builder predicate method. You must apply the predicate method to a field in the query result that you want to filter. You can use the same predicate methods in standard query filter predicates that you use on queries themselves.

The following Gosu code creates a standard query filter that can apply to query results that include Address instances. The standard query filter predicate uses a compare predicate method on the City field.

var myQueryFilter = new StandardQueryFilter("myQueryFilter",
        \ query -> {query.compare("City", Equals, "Bloomington")})