Parameter

Parameter helps you shape data from external sources into Elixir internal types. Use it to deal with any external data in general, such as API integrations, parsing user input, or validating data that comes into your system.

Parameter offers the following helpers:

• Schema creation and validation
• Input data validation
• Deserialization
• Serialization

Examples

defmodule UserParam do
  use Parameter.Schema
  alias Parameter.Validators

  param do
    field :first_name, :string, key: "firstName", required: true
    field :last_name, :string, key: "lastName"
    field :email, :string, validator: &Validators.email/1
    has_one :address, Address do
      field :city, :string, required: true
      field :street, :string
      field :number, :integer
    end
  end
end

Load (deserialize) the schema against external parameters:

params = %{
  "firstName" => "John",
  "lastName" => "Doe",
  "email" => "john@email.com",
  "address" => %{"city" => "New York", "street" => "York"}
}
Parameter.load(UserParam, params)
{:ok, %{
  first_name: "John",
  last_name: "Doe",
  email: "john@email.com",
  address: %{city: "New York", street: "York"}
}}

or Dump (serialize) a populated schema to params:

schema = %{
  first_name: "John",
  last_name: "Doe",
  email: "john@email.com",
  address: %{city: "New York", street: "York"}
}

Parameter.dump(UserParam, params)
{:ok,
 %{
    "firstName" => "John",
    "lastName" => "Doe",
    "email" => "john@email.com",
    "address" => %{"city" => "New York", "street" => "York"}
}}

Parameter offers a similar Schema model from Ecto library to deal with parameters. The main use case is to parse response from external APIs. This library provides a well structured schema model which tries to parse the external data. Check the official documentation for more information.

Installation

Add parameter to your list of dependencies in mix.exs:

def deps do
  [
    {:parameter, "~> 0.13"}
  ]
end

add :parameter on .formatter.exs:

import_deps: [:parameter]

For Parameter with Ecto integration check out the parameter_ecto project.

License

Copyright (c) 2022, Paulo Curado.

Parameter source code is licensed under the Apache 2.0 License.