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stripity_stripe
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A Stripe client for Elixir.
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lib/stripe/changeset.ex
defmodule Stripe.Changeset do
alias Stripe.Util
@doc """
Takes changes as a map with atom or string keys, a nested schema map,
and an optional list of keys that can be unset.
Returns a whitelisted map that can be used to send to Stripe.
"""
@spec cast(map, map, atom, list) :: map
def cast(changes, schema, operation, nullable_keys \\ []) do
keys = Map.keys(schema)
changes = Util.atomize_keys(changes)
Enum.reduce(keys, %{}, fn key, acc ->
schema_value = schema[key]
change = Map.get(changes, key)
acc |> apply_changes(key, change, operation, schema_value, nullable_keys)
end)
end
defp apply_changes(acc, key, change, op, schema_value, _) when is_map(change) and not is_list(schema_value) do
Map.put(acc, key, cast(change, schema_value, op))
end
defp apply_changes(acc, key, change, op, schema_value, nullable_keys) do
check_operation(acc, key, change, op, schema_value, nullable_keys)
end
defp check_operation(acc, key, change, op, ops, nullable_keys) do
case Enum.member?(ops, op) do
true -> attempt_change(acc, key, change, nullable_keys)
false -> acc
end
end
defp attempt_change(acc, key, nil = change, nullable_keys) do
case Enum.member?(nullable_keys, key) do
true -> put_change(acc, key, change)
false -> acc
end
end
defp attempt_change(acc, key, change, _nullable_keys), do: put_change(acc, key, change)
defp put_change(acc, key, change) do
Map.put(acc, key, change)
end
end