$collection.find could return an Iterable

[szabgab]

Like this:

for $collection.find -> BSON::Document $d {
}

Which would require less code by the user.

[lizmat]

method iterator() {
   class :: does Iterator {
       has $.cursor
       method pull-one() {
           if $!cursor.fetch -> $d {
                $d
           }
           else {
                IterationEnd
           }
       }
   }.new(cursor => self)
}

This method defines an anonymous class that does the Iterator role, and instantiates an object of it using the Cursor object itself. Iterator classes must provide at least a "pull-one" method that should either return the next element, or the special IterationEnd value.

More documentation about the Iterator role can be found at https://docs.perl6.org/type/Iterator .

https://perl6.party/post/Perl-6-Seqs-Drugs-and-Rock-n-Roll and https://perl6.party/post/Perl-6-Seqs-Drugs-and-Rock-n-Roll--Part-2 contain a very nice introduction to this as well.

[MARTIMM]

Hi Gabor,

This is possible. The find method returns a Cursor object which can be used to get the documents. This can be done in two ways; using the Cursor object as an iterator or just use fetch in a while loop. In test 't/450-find.t' there is a sub 'check-document' at the end which does just that.

Regards, Marcel

On July 8, 2017 16:43:35 Gabor Szabo notifications@github.com wrote:

Like this:

for $collection.find -> BSON::Document $d {
}

Which would require less code by the user.

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