# Ravix Ecto
[](https://github.com/YgorCastor/ravix-ecto/actions/workflows/elixir.yml)
[RavenDB](https://ravendb.net/) is an amazing multi-model NoSQL database, and albeit it does not support SQL, its `RQL Language` if pretty close, so behold, now you can query it
like a simple Ecto-SQL database.
This adapter leverages the use of [Ravix](https://github.com/YgorCastor/ravix) as a driver between ecto and RavenDB
## Installing
Add Ravix Ecto to your mix.exs dependencies
```elixir
{:ravix_ecto, "~> 0.4.0"}
```
## Example
```elixir
# In your config/config.exs file
config :my_app, Store,
urls: [System.get_env("RAVENDB_URL", "http://localhost:8080")],
database: "test",
retry_on_failure: true,
retry_on_stale: true,
retry_backoff: 500,
retry_count: 3,
force_create_database: true,
document_conventions: %{
max_number_of_requests_per_session: 30,
max_ids_to_catch: 32,
timeout: 30,
use_optimistic_concurrency: false,
max_length_of_query_using_get_url: 1024 + 512,
identity_parts_separator: "/",
disable_topology_update: false
}
config :my_app, Repo, store: Store
# In your application code
defmodule Store do
use Ravix.Documents.Store, otp_app: :my_app
end
defmodule Repo do
use Ecto.Repo,
otp_app: :ravix_ecto,
adapter: Ravix.Ecto.Adapter
end
defmodule TestApplication do
use Application
def start(_opts, _) do
children = [
{Repo, [%{}]}
]
Supervisor.init(
children,
strategy: :one_for_one
)
end
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
```
# Caveats
### RavenDB does not support integer ids
In RavenDB all the IDs are strings, so the :id type will generate a non-integer type
### Aggregations on RavenDB are different
In RavenDB the aggregations use a [Map-Reduce index based aggregation](https://ravendb.net/learn/inside-ravendb-book/reader/4.0/11-mapreduce-and-aggregations-in-ravendb),
which gets a bit annoying to deal using Ecto, so for now, you can only do aggregations using Ravix Directly.
### Conflicts management
RavenDB deals a bit different with [conflicts](https://www.google.com/search?q=RavenDB+conflicts&oq=RavenDB+conflicts&aqs=chrome..69i57.2870j0j4&sourceid=chrome&ie=UTF-8), so
right now if you have a conflict, an exception will be raised. Ecto strategies are not supported yet.
### Associations
RavenDB is a Document-Database first, it does support a kind of [documents association](https://ravendb.net/docs/article-page/4.2/java/client-api/how-to/handle-document-relationships),
but i've not implemented it yet (mostly because i think relationships in documents sucks). You can however use embed schemas normally.
### Migrations
RavenDB is schemaless, so migrations are kind of useless. We can however use it to setup indexes and so on, but it's not implemented yet.
# TODOs
* Aggregations
* Conflict Management
* Associations
# Contributors
[mongodb_ecto](https://github.com/elixir-mongo/mongodb_ecto) - From who i shamelessly forked and adapted this driver, that saved me a lot of work : D
