## Algolia
This is an Elixir implementation of the Algolia search API.
To use it, add the following to your dependencies:
```elixir
defp deps do
[{:algolia, "~> 0.8.0"}]
end
```
## Configuration
#### Using environment variables:
ALGOLIA_APPLICATION_ID=YOUR_APPLICATION_ID
ALGOLIA_API_KEY=YOUR_API_KEY
#### Using config:
```elixir
config :algolia,
application_id: "YOUR_APPLICATION_ID",
api_key: "YOUR_API_KEY"
```
**Note**: You must use _admin_ API key rather than a _search_ API key to enable write access.
### Return values
All responses are deserialized into maps before returning one of these responses:
- `{:ok, response}`
- `{:error, error_code, response}`
- `{:error, "Cannot connect to Algolia"}`: The client implements retry
strategy on all Algolia hosts with increasing timeout. It should only
return this error when it has tried all 4 hosts.
[**More details here**](https://www.algolia.com/doc/rest#quick-reference).
## Examples
### Creating a client
All API function that make requests require a client.
```elixir
client = Algolia.new()
```
### Searching
#### Searching an index
```elixir
Algolia.search(client, "my_index", "some query")
```
With options:
```elixir
Algolia.search(client, "my_index", "some query", attributesToRetrieve: "firstname", hitsPerPage: 20)
```
See all available search options [**here**](https://www.algolia.com/doc/rest#full-text-search-parameters).
#### Browsing an index
Browsing is like search but skips most ranking and allows fetching more results at once.
```elixir
Algolia.browse(client, "my_index", query: "some query", filter: "color:red")
```
#### Multiple queries at once
```elixir
Algolia.multi(client, [
%{index_name: "my_index1", query: "search query"},
%{index_name: "my_index2", query: "another query", hitsPerPage: 3},
%{index_name: "my_index3", query: "3rd query", tagFilters: "promotion"}
])
```
You can specify a strategy to optimize your multiple queries:
- `:none`: Execute the sequence of queries until the end.
- `stop_if_enough_matches`: Execute the sequence of queries until the number of hits is reached by the sum of hits.
```elixir
Algolia.multi(client, [query1, query2], strategy: :stop_if_enough_matches)
```
### Saving
All `save_*` operations will overwrite the object at the objectID.
Save a single object to index without specifying objectID. You must have `objectID`
inside object, or use the `id_attribute` option (see below).
```elixir
Algolia.save_object(client, "my_index", %{objectID: "1"})
```
Save a single object with a given objectID:
```elixir
Algolia.save_object(client, "my_index", %{title: "hello"}, "12345")
```
Save multiple objects to an index:
```elixir
Algolia.save_objects(client, "my_index", [%{objectID: "1"}, %{objectID: "2"}])
```
### Updating
Partially update a single object:
```elixir
Algolia.partial_update_object(client, "my_index", %{title: "hello"}, "12345")
```
Update multiple objects. You must have `objectID` in each object, or use the `id_attribute` option (see below).
```elixir
Algolia.partial_update_objects(client, "my_index", [%{objectID: "1"}, %{objectID: "2"}])
```
Partial update by default creates a new object if an object does not exist at the
objectID. You can turn this off by passing `false` to the `:upsert?` option.
```elixir
Algolia.partial_update_object(client, "my_index", %{title: "hello"}, "12345", upsert?: false)
Algolia.partial_update_objects(client, "my_index", [%{id: "1"}, %{id: "2"}], id_attribute: :id, upsert?: false)
```
### `id_attribute` option
All write functions such as `save_object` and `partial_update_object` come with an `id_attribute` option that lets
you specify the `objectID` from an existing field in the object, so you do not have to generate it yourself.
```elixir
Algolia.save_object(client, "my_index", %{id: "2"}, id_attribute: :id)
```
It also works for batch operations, such as `save_objects` and `partial_update_objects`:
```elixir
Algolia.save_objects(client, "my_index", [%{id: "1"}, %{id: "2"}], id_attribute: :id)
```
### Wait for task
All write operations can be waited on by simply piping the response into `wait/1`:
```elixir
client
|> Algolia.save_object("my_index", %{id: "123"})
|> Algolia.wait(client)
```
The client polls the server to check the status of the task.
You can specify a time (in milliseconds) between each tick of the poll; the default is 1000ms (1 second).
```elixir
client
|> Algolia.save_object("my_index", %{id: "123"})
|> Algolia.wait(client, retry_delay: 2_000)
```
You can also explicitly pass a `taskID` to `wait_task`:
```elixir
{:ok, %{"taskID" => task_id, "indexName" => index}}
= Algolia.save_object(client, "my_index", %{id: "123"})
Algolia.wait_task(client, index, task_id)
```
Optionally including the poll interval:
```elixir
Algolia.wait(client, index, task_id, retry_delay: 2_000)
```
### Index related operations
#### Listing all indexes
```elixir
Algolia.list_indexes(client)
```
#### Move an index
```elixir
Algolia.move_index(client, source_index, destination_index)
```
#### Copy an index
```elixir
Algolia.copy_index(client, source_index, destination_index)
```
#### Clear an index
```elixir
Algolia.clear_index(client, index)
```
### Settings
#### Get index settings
```elixir
Algolia.get_settings(client, index)
```
Example response:
```elixir
{:ok,
%{"minWordSizefor1Typo" => 4,
"minWordSizefor2Typos" => 8,
"hitsPerPage" => 20,
"attributesToIndex" => nil,
"attributesToRetrieve" => nil,
"attributesToSnippet" => nil,
"attributesToHighlight" => nil,
"ranking" => [
"typo",
"geo",
"words",
"proximity",
"attribute",
"exact",
"custom"
],
"customRanking" => nil,
"separatorsToIndex" => "",
"queryType" => "prefixAll"}}
```
#### Update index settings
```elixir
Algolia.set_settings(client, index, %{"hitsPerPage" => 20})
> {:ok, %{"updatedAt" => "2013-08-21T13:20:18.960Z",
"taskID" => 10210332.
"indexName" => "my_index"}}
```
### Insights
#### Push events
```elixir
Algolia.push_events(client, [
%{
"eventType" => "click",
"eventName" => "Product Clicked",
"index" => "products",
"userToken" => "user-123456",
"objectIDs" => ["9780545139700", "9780439784542"],
"queryID" => "43b15df305339e827f0ac0bdc5ebcaa7",
"positions" => [7, 6]
}
])
```
