/elixir-assignment

Primary LanguageElixir

Assignment

We're looking to add weather information for sales prediction and dynamic pricing.

Since we're using GraphQL as our main interface for internal communication, we have to build a small proxy service to translate REST to GraphQL. We use Absinthe within Elixir to build GraphQL APIs.

Setup

  • Phoenix has been set up and is available to run the application server.
    Ecto has been disabled, as you won't need a database for this service, but can be enabled later if needed.
  • Absinthe is included for the GraphQL API.
  • Tesla is included for the REST API.
  • ExUnit is also set up with some scaffolding in place. You must fill this in with your own tests.

Expected API

The way it should work is as follows:

  • a user sends the GrapQL query to the server (Absinthe)
  • the server send the request to the REST API from OpenWeatherMap (Tesla)
  • the server responds to the user with the data from OpenWeatherMap in the GrapQL format

You can go ahead and create your own API key on https://openweathermap.org/api/one-call-api (it’s free)

An example query and input can be found below. Think carefully of what type a field could be.

Amsterdam: 52.3667° N, 4.8945° E

Input:

{
  "input": {
    "latitude": "52.3667",
    "longitude": "4.8945"
  }
}

Query:

query WeatherForecast($input: CoordinateInput!) {
  weatherForecast(input: $input) {
    date
    sunrise
    sunset
    temperature
    feelsLike
    weather {
      main
      description
    }
    daily {
      date
      pressure
      humidity
      temperature {
        day
        min
        max
        night
        evening
        morning
      }
      feelsLike {
        day
        night
        evening
        morning
      }
    }
  }
}