- Supports MongoDB versions 2.4, 2.6, 3.0, 3.2, 3.4
- Connection pooling (through db_connection)
- Streaming cursors
- Performant ObjectID generation
- Follows driver specification set by 10gen
- Safe (by default) and unsafe writes
- Aggregation pipeline
- Replica sets
- Make sure requests don't go over the 16mb limit
- New 2.6 write queries and bulk writes
- Use meta-driver test suite
- Server selection / Read preference
BSON Elixir
---------- ------
double 0.0
string "Elixir"
document [{"key", "value"}] | %{"key" => "value"} (1)
binary %BSON.Binary{binary: <<42, 43>>, subtype: :generic}
object id %BSON.ObjectId{value: <<...>>}
boolean true | false
UTC datetime %DateTime{}
null nil
regex %BSON.Regex{pattern: "..."}
JavaScript %BSON.JavaScript{code: "..."}
integer 42
symbol "foo" (2)
min key :BSON_min
max key :BSON_max
-
Since BSON documents are ordered Elixir maps cannot be used to fully represent them. This driver chose to accept both maps and lists of key-value pairs when encoding but will only decode documents to lists. This has the side-effect that it's impossible to discern empty arrays from empty documents. Additionally the driver will accept both atoms and strings for document keys but will only decode to strings.
-
BSON symbols can only be decoded.
Add mongodb to your mix.exs deps
and :applications
(replace >= 0.0.0
in deps
if you want a specific version). Mongodb supports the same pooling libraries db_connection does (currently: no pooling, poolboy, and sbroker). If you want to use poolboy as pooling library you should set up your project like this:
def application do
[applications: [:mongodb, :poolboy]]
end
defp deps do
[{:mongodb, ">= 0.0.0"},
{:poolboy, ">= 0.0.0"}]
end
Then run mix deps.get
to fetch dependencies.
By default mongodb will start a single connection, but it also supports pooling with the :pool
option. For poolboy add the pool: DBConnection.Poolboy
option to Mongo.start_link
and to all function calls in Mongo
using the pool.
# Starts an unpooled connection
{:ok, conn} = Mongo.start_link(database: "test")
# Gets an enumerable cursor for the results
cursor = Mongo.find(conn, "test-collection", %{})
cursor
|> Enum.to_list()
|> IO.inspect
If you're using pooling it is recommend to add it to your application supervisor:
def start(_type, _args) do
import Supervisor.Spec
children = [
worker(Mongo, [[name: :mongo, database: "test", pool: DBConnection.Poolboy]])
]
opts = [strategy: :one_for_one, name: MyApp.Supervisor]
Supervisor.start_link(children, opts)
end
Then you can use the pool as following:
Mongo.find(:mongo, "collection", %{}, limit: 20, pool: DBConnection.Poolboy)
To connect to a Mongo cluster that is using replica sets, it is recommended to use the :seeds
list instead of a :hostname
and :port
pair.
{:ok, pid} = Mongo.start_link(database: "test", seeds: ["hostname1.net:27017", "hostname2.net:27017"])
This will allow for scenarios where the first "hostname1.net:27017"
is unreachable for any reason and will automatically try to connect to each of the following entries in the list to connect to the cluster.
Using $and
Mongo.find(:mongo, "users", %{"$and" => [%{email: "[email protected]"}, %{first_name: "first_name"}]})
Using $or
Mongo.find(:mongo, "users", %{"$or" => [%{email: "[email protected]"}, %{first_name: "first_name"}]})
Using $in
Mongo.find(:mongo, "users", %{email: %{"$in" => ["[email protected]", "[email protected]"]}})
The SSL test suite is enabled by default. You have two options. Either exclude the SSL tests or enable SSL on your Mongo server.
mix test --exclude ssl
$ openssl req -newkey rsa:2048 -new -x509 -days 365 -nodes -out mongodb-cert.crt -keyout mongodb-cert.key
$ cat mongodb-cert.key mongodb-cert.crt > mongodb.pem
$ mongod --sslMode allowSSL --sslPEMKeyFile /path/to/mongodb.pem
- For
--sslMode
you can use one ofallowSSL
orpreferSSL
- You can enable any other options you want when starting
mongod
Copyright 2015 Justin Wood
Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.