# Mongo.Ecto
[](https://hex.pm/packages/mongodb_ecto)
[](https://hex.pm/packages/mongodb_ecto)
[](https://hexdocs.pm/mongodb_ecto/)
[](https://hex.pm/packages/mongodb_ecto)
[](https://github.com/elixir-mongo/mongodb_ecto/blob/master/LICENSE)
[](https://github.com/elixir-mongo/mongodb_ecto/commits/master)
`Mongo.Ecto` is a MongoDB adapter for Ecto.
For detailed information read the documentation for the `Mongo.Ecto` module,
or check out examples below.
## Example
```elixir
# In your config/config.exs file
config :my_app, Repo,
adapter: Mongo.Ecto,
database: "ecto_simple",
username: "mongodb",
password: "mongosb",
hostname: "localhost"
# In your application code
defmodule Repo do
use Ecto.Repo, otp_app: :my_app
end
defmodule Weather do
use Ecto.Model
@primary_key {:id, :binary_id, autogenerate: true}
schema "weather" do
field :city # Defaults to type :string
field :temp_lo, :integer
field :temp_hi, :integer
field :prcp, :float, default: 0.0
end
end
defmodule Simple do
import Ecto.Query
def sample_query do
query = from w in Weather,
where: w.prcp > 0 or is_nil(w.prcp),
select: w
Repo.all(query)
end
end
```
## Usage
Add `:mongodb_ecto` as a dependency in your `mix.exs` file.
```elixir
def deps do
[
{:mongodb_ecto, "~> 1.0.0"}
]
end
```
You should also update your applications to include both projects:
```elixir
def application do
[applications: [:logger, :mongodb_ecto, :ecto]]
end
```
To use the adapter in your repo:
```elixir
defmodule MyApp.Repo do
use Ecto.Repo,
otp_app: :my_app,
adapter: Mongo.Ecto
end
```
For additional information on usage please see the documentation for [Ecto](http://hexdocs.pm/ecto).
## Data Type Mapping
| BSON | Ecto |
| ------------------ | ----------------------- |
| double | `:float` |
| string | `:string` |
| object | `:map` |
| array | `{:array, subtype}` |
| binary data | `:binary` |
| binary data (uuid) | `Ecto.UUID` |
| object id | `:binary_id` |
| boolean | `:boolean` |
| date | `Ecto.DateTime` |
| regular expression | `Mongo.Ecto.Regex` |
| JavaScript | `Mongo.Ecto.JavaScript` |
| symbol | (see below) |
| 32-bit integer | `:integer` |
| timestamp | `BSON.Timestamp` |
| 64-bit integer | `:integer` |
Symbols are deprecated by the
[BSON specification](http://bsonspec.org/spec.html). They will be converted
to simple strings on reads. There is no possibility of persisting them to
the database.
Additionally special values are translated as follows:
| BSON | Ecto |
| ------- | ----------- |
| null | `nil` |
| min key | `:BSON_min` |
| max key | `:BSON_max` |
## Supported Mongo versions
The adapter and the driver are tested against most recent versions from 5.0, 6.0, and 7.0.
## Migrating to 2.0
Release 2.0 changes the underlying driver from [`mongodb`](https://github.com/elixir-mongo/mongodb) to [`mongodb_driver`](https://github.com/zookzook/elixir-mongodb-driver) 1.4.0. Calls to the Ecto adapter itself should not require any changes. Some config options are no longer used and can be simply deleted: `pool`, `pool_overflow`, `pool_timeout`.
If you make direct calls to the `Mongo` driver, you will need to update some of them to account for the `mongodb` -> `mongodb_driver` upgrade. Also, remember to replace `:mongodb` with `{:mongodb_driver, "~> 1.4.0"}` in your `mix.exs`. The known updates are:
1. `Mongo` functions no longer accept a `pool` option or `MyApp.Repo.Pool` module argument. Instead, a pool PID is expected:
```elixir
# Old driver call
Mongo.find(MyApp.Repo.Pool, "my_coll", %{"id": id}, projection: %{"field": 1}, pool: db_pool())
# New driver call
Mongo.find(MyApp.Repo.pool(), "my_coll", %{"id": id}, projection: %{"field": 1})
# repo.ex
# Provided the following function is defined in MyApp.Repo:
defmodule MyApp.Repo do
use Ecto.Repo, otp_app: :my_app, adapter: Mongo.Ecto
def pool() do
Ecto.Adapter.lookup_meta(__MODULE__).pid
end
end
```
2. [`Mongo.command`](https://hexdocs.pm/mongodb_driver/1.4.1/Mongo.html#command/3) requires a keyword list instead of a document. E.g., instead of `Mongo.command(MyApp.Repo.pool(), %{listCollections: 1}, opts)`, do `Mongo.command(MyApp.Repo.pool(), [listCollections: 1], opts)`.
3. `Mongo.ReadPreferences.defaults` is renamed to `Mongo.ReadPreference.merge_defaults`.
4. When passing a `hint` to `Mongo.find_one` etc., if the hinted index does not exist, an error is now returned.
## Contributing
To contribute you need to compile `Mongo.Ecto` from source and test it:
```
$ git clone https://github.com/ankhers/mongodb_ecto.git
$ cd mongodb_ecto
$ mix test
```
## Copyright and License
Copyright 2015 Michał Muskała
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 [https://www.apache.org/licenses/LICENSE-2.0](https://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.
