# CreditCard
[](https://travis-ci.org/abakhi/credit_card)
Elixir library for validating credit card numbers (a port of [credit_card_validator](https://github.com/tobias/credit_card_validator) Ruby gem)
## Documentation
See the tests folder for examples of how to use this library.
API documentation can be found at [http://hexdocs.pm/credit_card](http://hexdocs.pm/credit_card)
### Using with Phoenix and Ecto
```elixir
defmodule MyApp.Card do
use MyApp.Web, :model
schema "cards" do
field :card_number, :integer
field :name_on_card, :string
field :valid_from, Ecto.Date
field :expires, Ecto.Date
timestamps
end
@required_fields ~w(card_number name_on_card valid_from expires)
@optional_fields ~w()
@doc """
Creates a changeset based on the `model` and `params`.
If no params are provided, an invalid changeset is returned
with no validation performed.
"""
def changeset(model, params \\ :empty) do
model
|> cast(params, @required_fields, @optional_fields)
|> validate_credit_card(:card_number)
end
def validate_credit_card(changeset, field \\ :card_number, opts \\ []) do
validate_change changeset, field, fn _field, number ->
message = opts[:message] || "Invalid credit card number"
if CreditCard.valid?(to_string(number)) do
[]
else
[field, message]
end
end
end
end
```
## TODO
Incorporate some ideas from [Card](https://github.com/jessepollak/card)
* Check CVC length and number length
* Differentiate between VISA and VISA electron
## Installation
The package can be installed as:
1. Add credit_card to your list of dependencies in `mix.exs`:
def deps do
[{:credit_card, "~> 1.0.0"}]
end
