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Change headings to be consistent with driver docs (#220)
Co-authored-by: Oleg Pudeyev <[email protected]>
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‎docs/tutorials/bson-v3.txt‎

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.. _ruby-bson-tutorial:
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=================
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*****************
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BSON 3.x Tutorial
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=================
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*****************
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.. default-domain:: mongodb
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This tutorial discusses using the core Ruby BSON gem.
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Installation
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------------
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============
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The BSON library is hosted on `Rubygems <http://rubygems.org>`_ and can be
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installed manually or with bundler.
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BSON Serialization
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------------------
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==================
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Getting a Ruby object's raw BSON representation is done by calling ``to_bson``
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on the Ruby object. For example:
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specific to the specification:
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``BSON::Binary``
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````````````````
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----------------
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This is a representation of binary data, and must provide the raw data and
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a subtype when constructing.
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- ``:user``
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``BSON::Code``
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``````````````
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--------------
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Represents a string of Javascript code.
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BSON::Code.new("this.value = 5;")
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``BSON::CodeWithScope``
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```````````````````````
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-----------------------
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Represents a string of Javascript code with a hash of values.
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BSON::CodeWithScope.new("this.value = age;", age: 5)
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``BSON::Document``
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``````````````````
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------------------
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This is a subclass of a hash that stores all keys as strings but allows access to
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them with symbol keys.
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BSON::Document.new
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``BSON::MaxKey``
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----------------
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Represents a value in BSON that will always compare higher to another value.
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BSON::MaxKey.new
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``BSON::MinKey``
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----------------
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Represents a value in BSON that will always compare lower to another value.
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BSON::MinKey.new
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``BSON::ObjectId``
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------------------
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Represents a 12 byte unique identifier for an object on a given machine.
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BSON::ObjectId.new
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``BSON::Timestamp``
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-------------------
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Represents a special time with a start and increment value.
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BSON::Timestamp.new(5, 30)
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``BSON::Undefined``
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-------------------
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Represents a placeholder for a value that was not provided.
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BSON::Undefined.new
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JSON Serialization
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------------------
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==================
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Some BSON types have special representations in JSON. These are as follows
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and will be automatically serialized in the form when calling ``to_json`` on
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Special Ruby Date Classes
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-------------------------
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=========================
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Ruby's ``Date`` and ``DateTime`` are able to be serialized, but when
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they are deserialized they will always be returned as a ``Time`` since the BSON
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specification only has a ``Time`` type and knows nothing about Ruby.
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Compiling Regexes
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-----------------
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=================
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When regular expressions are deserialized, they return a wrapper that holds the
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raw regex string, but does not compile it. In order to get the Ruby ``Regexp``

‎docs/tutorials/bson-v4.txt‎

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.. _ruby-bson-tutorial-4-0:
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5-
=================
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*****************
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BSON 4.x Tutorial
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=================
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*****************
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.. default-domain:: mongodb
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This tutorial discusses using the Ruby BSON library.
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Installation
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------------
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============
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The BSON library can be installed from `Rubygems <http://rubygems.org>`_
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manually or with bundler.
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The BSON library is compatible with MRI >= 2.3 and JRuby >= 9.2.
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Use With ActiveSupport
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----------------------
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======================
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Serialization for ActiveSupport-defined classes, such as TimeWithZone, is
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not loaded by default to avoid a hard dependency of BSON on ActiveSupport.
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require 'bson/active_support'
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BSON Serialization
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==================
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Getting a Ruby object's raw BSON representation is done by calling ``to_bson``
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on the Ruby object, which will return a ``BSON::ByteBuffer``. For example:
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Byte Buffers
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============
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BSON library 4.0 introduces the use of native byte buffers in MRI and JRuby
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instead of using ``StringIO``, for improved performance.
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Writing
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To create a ``ByteBuffer`` for writing (i.e. serializing to BSON),
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instantiate ``BSON::ByteBuffer`` with no arguments:
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Reading
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To create a ``ByteBuffer`` for reading (i.e. deserializing from BSON),
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instantiate ``BSON::ByteBuffer`` with a byte string as the argument:
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Supported Classes
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=================
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Core Ruby classes that have representations in the BSON specification and
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will have a ``to_bson`` method defined for them are: ``Object``, ``Array``,
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``BSON::Binary``
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Use ``BSON::Binary`` objects to store arbitrary binary data. The ``Binary``
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UUID Methods
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To create a UUID BSON::Binary (binary subtype 4) from its RFC 4122-compliant
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string representation, use the ``from_uuid`` method:
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of subtype ``:uuid`` (not ``:uuid_old``).
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Legacy UUIDs
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Data stored in BSON::Binary objects of subtype 3 (``:uuid_old``) may be
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``BSON::Code``
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``BSON::CodeWithScope``
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.. note::
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BSON::CodeWithScope.new("this.value = age;", age: 5)
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``BSON::Document``
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This is a subclass of ``Hash`` that stores all keys as strings, but allows
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``BSON::MaxKey``
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Represents a value in BSON that will always compare higher to another value.
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BSON::MaxKey.new
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``BSON::MinKey``
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Represents a value in BSON that will always compare lower to another value.
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BSON::MinKey.new
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``BSON::ObjectId``
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Represents a 12 byte unique identifier for an object on a given machine.
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``BSON::Timestamp``
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Represents a special time with a start and increment value.
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BSON::Timestamp.new(5, 30)
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decimal rounding with exact precision.
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``Symbol``
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Ruby ``Symbol`` values (i.e., a Ruby ``Symbol``is encoded into a BSON symbol
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JSON Serialization
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Some BSON types have special representations in JSON. These are as follows
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Time Instances
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Date Instances
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BSON documents preserve the order of keys, because the documents are stored
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Duplicate Keys
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BSON specification allows BSON documents to have duplicate keys, because the
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documents are stored as lists of key-value pairs. Applications should refrain

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