diff --git a/docs/changelog.rst b/docs/changelog.rst
index 64bf2775..036ad1d1 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -7,9 +7,10 @@ Changelog
Development
===========
- (Fill this out as you fix issues and develop your features).
+- Improve connection doc #2481
Changes in 0.23.0
-===========
+=================
- Bugfix: manually setting SequenceField in DynamicDocument doesn't increment the counter #2471
- Add MongoDB 4.2 and 4.4 to CI
- Add support for allowDiskUse on querysets #2468
diff --git a/docs/guide/connecting.rst b/docs/guide/connecting.rst
index fea5e97b..387151df 100644
--- a/docs/guide/connecting.rst
+++ b/docs/guide/connecting.rst
@@ -5,7 +5,7 @@ Connecting to MongoDB
=====================
Connections in MongoEngine are registered globally and are identified with aliases.
-If no `alias` is provided during the connection, it will use "default" as alias.
+If no ``alias`` is provided during the connection, it will use "default" as alias.
To connect to a running instance of :program:`mongod`, use the :func:`~mongoengine.connect`
function. The first argument is the name of the database to connect to::
@@ -14,27 +14,66 @@ function. The first argument is the name of the database to connect to::
connect('project1')
By default, MongoEngine assumes that the :program:`mongod` instance is running
-on **localhost** on port **27017**. If MongoDB is running elsewhere, you should
-provide the :attr:`host` and :attr:`port` arguments to
-:func:`~mongoengine.connect`::
+on **localhost** on port **27017**.
- connect('project1', host='192.168.1.35', port=12345)
+If MongoDB is running elsewhere, you need to provide details on how to connect. There are two ways of
+doing this. Using a connection string in URI format (**this is the preferred method**) or individual attributes
+provided as keyword arguments.
+
+Connect with URI string
+=======================
+
+When using a connection string in URI format you should specify the connection details
+as the :attr:`host` to :func:`~mongoengine.connect`. In a web application context for instance, the URI
+is typically read from the config file::
+
+ connect(host="mongodb://127.0.0.1:27017/my_db")
+
+If the database requires authentication, you can specify it in the
+URI. As each database can have its own users configured, you need to tell MongoDB
+where to look for the user you are working with, that's what the ``?authSource=admin`` bit
+of the MongoDB connection string is for::
+
+ # Connects to 'my_db' database by authenticating
+ # with given credentials against the 'admin' database (by default as authSource isn't provided)
+ connect(host="mongodb://my_user:my_password@127.0.0.1:27017/my_db")
+
+ # Equivalent to previous connection but explicitly states that
+ # it should use admin as the authentication source database
+ connect(host="mongodb://my_user:my_password@hostname:port/my_db?authSource=admin")
+
+ # Connects to 'my_db' database by authenticating
+ # with given credentials against that same database
+ connect(host="mongodb://my_user:my_password@127.0.0.1:27017/my_db?authSource=my_db")
+
+The URI string can also be used to configure advanced parameters like ssl, replicaSet, etc. For more
+information or example about URI string, you can refer to the `official doc `_::
+
+ connect(host="mongodb://my_user:my_password@127.0.0.1:27017/my_db?authSource=admin&ssl=true&replicaSet=globaldb")
+
+.. note:: URI containing SRV records (e.g "mongodb+srv://server.example.com/") can be used as well
+
+Connect with keyword attributes
+===============================
+
+The second option for specifying the connection details is to provide the information as keyword
+attributes to :func:`~mongoengine.connect`::
+
+ connect('my_db', host='127.0.0.1', port=27017)
If the database requires authentication, :attr:`username`, :attr:`password`
and :attr:`authentication_source` arguments should be provided::
- connect('project1', username='webapp', password='pwd123', authentication_source='admin')
+ connect('my_db', username='my_user', password='my_password', authentication_source='admin')
-URI style connections are also supported -- just supply the URI as
-the :attr:`host` to
-:func:`~mongoengine.connect`::
-
- connect('project1', host='mongodb://localhost/database_name')
-
-.. note:: URI containing SRV records (e.g mongodb+srv://server.example.com/) can be used as well as the :attr:`host`
+The set of attributes that :func:`~mongoengine.connect` recognizes includes but is not limited to:
+:attr:`host`, :attr:`port`, :attr:`read_preference`, :attr:`username`, :attr:`password`, :attr:`authentication_source`, :attr:`authentication_mechanism`,
+:attr:`replicaset`, :attr:`tls`, etc. Most of the parameters accepted by `pymongo.MongoClient `_
+can be used with :func:`~mongoengine.connect` and will simply be forwarded when instantiating the `pymongo.MongoClient`.
.. note:: Database, username and password from URI string overrides
- corresponding parameters in :func:`~mongoengine.connect`: ::
+ corresponding parameters in :func:`~mongoengine.connect`, this should
+ obviously be avoided: ::
connect(
db='test',
@@ -43,28 +82,19 @@ the :attr:`host` to
host='mongodb://admin:qwerty@localhost/production'
)
- will establish connection to ``production`` database using
- ``admin`` username and ``12345`` password.
+ will establish connection to ``production`` database using ``admin`` username and ``qwerty`` password.
.. note:: Calling :func:`~mongoengine.connect` without argument will establish
a connection to the "test" database by default
-Replica Sets
-============
+Read Preferences
+================
-MongoEngine supports connecting to replica sets::
-
- from mongoengine import connect
-
- # Regular connect
- connect('dbname', replicaset='rs-name')
-
- # MongoDB URI-style connect
- connect(host='mongodb://localhost/dbname?replicaSet=rs-name')
-
-Read preferences are supported through the connection or via individual
+As stated above, Read preferences are supported through the connection but also via individual
queries by passing the read_preference ::
+ from pymongo import ReadPreference
+
Bar.objects().read_preference(ReadPreference.PRIMARY)
Bar.objects(read_preference=ReadPreference.PRIMARY)