man Mango::Collection (3): MongoDB collection

SYNOPSIS

use Mango::Collection;
my $collection = Mango::Collection->new(db => $db);
my $cursor = $collection->find({foo => 'bar'});

DESCRIPTION

Mango::Collection is a container for MongoDB collections used by Mango::Database.

ATTRIBUTES

Mango::Collection implements the following attributes.

db

  my $db      = $collection->db;
  $collection = $collection->db(Mango::Database->new);

Mango::Database object this collection belongs to.

name

  my $name    = $collection->name;
  $collection = $collection->name('bar');

Name of this collection.

METHODS

Mango::Collection inherits all methods from Mojo::Base and implements the following new ones.

aggregate

  my $cursor = $collection->aggregate(
    [{'$group' => {_id => undef, total => {'$sum' => '$foo'}}}]);
  my $collection = $collection->aggregate(
    [{'$match' => {'$gt' => 23}}, {'$out' => 'some_collection'}]);
  my $doc = $collection->aggregate(
    [{'$match' => {'$gt' => 23}}], {explain => bson_true});

Aggregate collection with aggregation framework, additional options will be passed along to the server verbatim. You can also append a callback to perform operation non-blocking.

  my $pipeline = [{'$group' => {_id => undef, total => {'$sum' => '$foo'}}}];
  $collection->aggregate($pipeline => sub {
    my ($collection, $err, $cursor) = @_;
    ...
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

build_index_name

  my $name = $collection->build_index_name(bson_doc(foo => 1, bar => -1));
  my $name = $collection->build_index_name({foo => 1});

Build name for index specification, the order of keys matters for compound indexes.

bulk

  my $bulk = $collection->bulk;

Build Mango::Bulk object.

  my $bulk = $collection->bulk;
  $bulk->insert({foo => $_}) for 1 .. 10;
  $bulk->find({foo => 4})->update_one({'$set' => {bar => 'baz'}});
  $bulk->find({foo => 7})->remove_one;
  my $results = $bulk->execute;

create

  $collection->create;
  $collection->create({capped => bson_true, max => 5, size => 10000});

Create collection. You can also append a callback to perform operation non-blocking.

  $collection->create({capped => bson_true, max => 5, size => 10000} => sub {
    my ($collection, $err) = @_;
    ...
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

drop

  $collection->drop;

Drop collection. You can also append a callback to perform operation non-blocking.

  $collection->drop(sub {
    my ($collection, $err) = @_;
    ...
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

drop_index

  $collection->drop_index('foo');

Drop index. You can also append a callback to perform operation non-blocking.

  $collection->drop_index(foo => sub {
    my ($collection, $err) = @_;
    ...
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

ensure_index

  $collection->ensure_index(bson_doc(foo => 1, bar => -1));
  $collection->ensure_index({foo => 1});
  $collection->ensure_index({foo => 1}, {unique => bson_true});

Make sure an index exists, the order of keys matters for compound indexes, additional options will be passed along to the server verbatim. You can also append a callback to perform operation non-blocking.

  $collection->ensure_index(({foo => 1}, {unique => bson_true}) => sub {
    my ($collection, $err) = @_;
    ...
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

find

  my $cursor = $collection->find;
  my $cursor = $collection->find({foo => 'bar'});
  my $cursor = $collection->find({foo => 'bar'}, {foo => 1});

Build Mango::Cursor::Query object for query.

  # Exclude "_id" field from results
  my $docs = $collection->find({foo => 'bar'}, {_id => 0})->all;

find_and_modify

  my $doc = $collection->find_and_modify(
    {query => {foo => 'bar'}, update => {'$set' => {foo => 'baz'}}});

Fetch and update or remove a document atomically. You can also append a callback to perform operation non-blocking.

  my $opts = {query => {foo => 'bar'}, update => {'$set' => {foo => 'baz'}}};
  $collection->find_and_modify($opts => sub {
    my ($collection, $err, $doc) = @_;
    ...
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

By default this method returns the unmodified version of the document. To change this behaviour, add the option "new => 1".

find_one

  my $doc = $collection->find_one({foo => 'bar'});
  my $doc = $collection->find_one({foo => 'bar'}, {foo => 1});
  my $doc = $collection->find_one($oid, {foo => 1});

Find one document. You can also append a callback to perform operation non-blocking.

  $collection->find_one({foo => 'bar'} => sub {
    my ($collection, $err, $doc) = @_;
    ...
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

full_name

  my $name = $collection->full_name;

Full name of this collection.

index_information

  my $info = $collection->index_information;
  # return only the 5 first indexes
  my $info = $collection->index_information(cursor => { batchSize => 5 });

Get index information for collection. You can also append a callback to perform operation non-blocking.

  $collection->index_information(sub {
    my ($collection, $err, $info) = @_;
    ...
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

insert

  my $oid  = $collection->insert({foo => 'bar'});
  my $oids = $collection->insert([{foo => 'bar'}, {baz => 'yada'}]);

Insert one or more documents into collection. You can also append a callback to perform operation non-blocking.

  $collection->insert({foo => 'bar'} => sub {
    my ($collection, $err, $oid) = @_;
    ...
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

Note that "insert" has to ensure each document has an "_id" before sending them to MongoDB. To avoid modifying your data, it makes a copy of the documents. This can be a bit slow if you are sending big objects like pictures. To avoid that, consider using "save" instead.

map_reduce

  my $collection = $collection->map_reduce($map, $reduce, {out => 'foo'});
  my $docs = $collection->map_reduce($map, $reduce, {out => {inline => 1}});
  my $docs = $collection->map_reduce(
    bson_code($map), bson_code($reduce), {out => {inline => 1}});

Perform map/reduce operation on collection, additional options will be passed along to the server verbatim. You can also append a callback to perform operation non-blocking.

  $collection->map_reduce(($map, $reduce, {out => {inline => 1}}) => sub {
      my ($collection, $err, $docs) = @_;
      ...
    }
  );
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

options

  my $doc = $collection->options;

Get options for collection. You can also append a callback to perform operation non-blocking.

  $collection->options(sub {
    my ($collection, $err, $doc) = @_;
    ...
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

remove

  my $result = $collection->remove;
  my $result = $collection->remove($oid);
  my $result = $collection->remove({foo => 'bar'});
  my $result = $collection->remove({foo => 'bar'}, {single => 1});

Remove documents from collection. You can also append a callback to perform operation non-blocking. Returns a WriteResult document.

  $collection->remove(({foo => 'bar'}, {single => 1}) => sub {
    my ($collection, $err, $doc) = @_;
    ...
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

These options are currently available:

single

  single => 1

Remove only one document.

rename

  my $new_collection = $collection->rename('NewName');

Rename a collection, keeping all of its original contents and options. Returns a new Mango::Collection object pointing to the renamed collection. You can also append a callback to perform operation non-blocking.

  $collection->rename('NewName' => sub {
    my ($collection, $err, $oid) = @_;
    ...
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

save

  my $oid = $collection->save({foo => 'bar'});

Save document to collection. The document MUST have an "_id". You can also append a callback to perform operation non-blocking.

  $collection->save({foo => 'bar'} => sub {
    my ($collection, $err, $oid) = @_;
    ...
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

stats

  my $stats = $collection->stats;

Get collection statistics. You can also append a callback to perform operation non-blocking.

  $collection->stats(sub {
    my ($collection, $err, $stats) = @_;
    ...
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;

update

  my $result = $collection->update($oid, {foo => 'baz'});
  my $result = $collection->update({foo => 'bar'}, {foo => 'baz'});
  my $result = $collection->update({foo => 'bar'}, {foo => 'baz'}, {multi => 1});

Update document in collection. You can also append a callback to perform operation non-blocking. Returns a WriteResult document.

  $collection->update(({foo => 'bar'}, {foo => 'baz'}, {multi => 1}) => sub {
    my ($collection, $err, $doc) = @_;
    ...
  });
  Mojo::IOLoop->start unless Mojo::IOLoop->is_running;