Validations and Conversions

A comprehensive set of data structure validation and related helper functions, designed to work without external dependencies.

Usage

• Add request_validations to your list of dependencies in mix.exs:

defp deps do
  [
    {:valicon, "~> 1.0"}
  ]
end

Example

For example you can use this validation on the pure HTTP data that comes in the controller. Before this data continues to the business logic.

First we need a module that will handle the validation of the data. This module will use the RequestValidations module. This will atomoize the allowed keys you provide and trim the whitespaces of the values. Then you can use the validate function to validate the data. If you want to add more validations you can add them to the list.

defmodule MaApp.CustomerRequest do 
    use Valicon
 
    def new(attrs) do 
        attrs 
        |> atomize_keys(~w[role name id]a)
        |> trim_whitespaces()
        |> validate([
             &validate_required(&1, ~w[:role]a),
             &validate_enum(&1, :role, ~w[user admin])
            ])

    end

end 

Then in your controller you can use it like this:

defmodule CustomerController do 
    ... 
     def create(conn, params) do
    with {:ok, data} <- CustomerRequest.new_customer(params),
         {:ok, customer} <- Customers.create(data) do
       render(conn,"customer.json", customer: customer)
    end
  end

end