Avex.Model

Register a function to update the field

The function must be in the module’s context

All update functions are executed before the validations

Examples

update :field, capitalize

def capitalize(value) when is_binary(value) do
  String.capitalize
end

def capitalize(nil), do: nil

Defines and register an update function

Examples

update :field, value do
  case Integer.parse(value) do
    {i, _} -> i
    :error -> nil
  end
end

Guards are also supported

update :field, value when is_binary(value) do
  case Integer.parse(value) do
    {i, _} -> i
    :error -> nil
  end
end

update :field, value when is_integer(value), do: value
update :field, _, do: nil

Register a function to validate the field

The function can be any of the pre-defined functions or a validation function at the module context.

Examples

validate :field, present(message: "required")

validate :field, my_validation(message: "hey you")

def my_validation(value, opts \ []) do
  if value do
    {true, value}
  else
    {false, Keyword.get(opts, :message) || "my message"}
  end
end

Defines and register a new validation function

Examples

validate :field, value do
  {true, value}
end

Guards are also supported

validate :field, value when is_binary(value) do
  {true, value}
end

validate :field, _, do: {false, "invalid"}

Mark the provided fields as required

It is also possible to specify a :message to be returned for every invalid field

Example

validate_presence_of([:title, :body], message: "required")