NAME

       UR::Object::Iterator - API for iterating through objects matching a rule

SYNOPSIS

         my $rule = UR::BoolExpr->resolve('Some::Class', foo => 1);
         my $iter = UR::Object::Iterator->create_for_filter_rule($rule);
         while (my $obj = $iter->next()) {
             print "Got an object: ",$obj->id,"\n";
         }

         # Equivalent
         my $iter2 = Some::Class->create_iterator(foo => 1);
         while (my $obj = $iter2->next()) {
             print "Got an object: ",$obj->id,"\n";
         }

DESCRIPTION

       get(), implemented in UR::Object, is the usual way for retrieving sets of objects matching
       particular properties.  When the result set of data is large, it is often more efficient
       to use an iterator to access the data instead of getting it all in one list.

       UR::Object implements create_iterator(), which is just a wrapper around
       create_for_filter_rule().

       UR::Object::Iterator instances are normal Perl object references, not UR-based objects.
       They do not live in the Context's object cache, and obey the normal Perl rules about
       scoping.

METHODS

       create_for_filter_rule
             $iter = UR::Object::Iterator->create_for_filter_rule($boolexpr);

           Creates an iterator object based on the given BoolExpr (rule).  Under the hood, it
           calls get_objects_for_class_and_rule() on the current Context with the $return_closure
           flag set to true.

       next
             $obj = $iter->next();

           Return the next object matching the iterator's rule.  When there are no more matching
           objects, it returns undef.

SEE ALSO

       UR::Object, UR::Context