View Source Ash.Type.File (ash v3.4.45)

A type that represents a file on the filesystem.

Persistence

This type does not support persisting via Ash.DataLayer.

It is mainly intended to be used in arguments.

Valid values to cast

This type can cast multiple types of values:

Summary

Types

t()

Functions

from_io(device)

Create a file from an IO.device()

from_path(path)

Create a file from a path.

handle_change?()
open(file, modes \\ [])

Open the file with the given modes.

path(file)

Returns the path to the file.

prepare_change?()

Types

t()

@type t() :: %Ash.Type.File{
  implementation: Ash.Type.File.Implementation.t(),
  source: Ash.Type.File.Implementation.source()
}

Functions

from_io(device)

@spec from_io(device :: IO.device()) :: t()

Create a file from an IO.device()

Example 

iex> path = "README.md"
...> {:ok, device} = File.open(path)
...> Ash.Type.File.from_io(device)
%Ash.Type.File{source: device, implementation: Ash.Type.File.IO}

from_path(path)

@spec from_path(path :: Path.t()) :: t()

Create a file from a path.

Example 

iex> path = "README.md"
...> Ash.Type.File.from_path(path)
%Ash.Type.File{source: "README.md", implementation: Ash.Type.File.Path}

handle_change?()

open(file, modes \\ [])

@spec open(file :: t(), modes :: [File.mode()]) ::
  {:ok, IO.device()} | {:error, Ash.Type.File.Implementation.error()}

Open the file with the given modes.

This function will delegate to the open/2 function on the implementation.

For details on the modes argument, see the File.open/2 documentation.

Example 

iex> path = "README.md"
...> file = Ash.Type.File.from_path(path)
...> Ash.Type.File.open(file, [:read])
...> # => {:ok, #PID<0.109.0>}

path(file)

@spec path(file :: t()) ::
  {:ok, Path.t()}
  | {:error, :not_supported | Ash.Type.File.Implementation.error()}

Returns the path to the file.

Not every implementation will support this operation. If the implementation does not support this operation, then {:error, :not_supported} will be returned. In this case, use the open/2 function to access the file.

Example 

iex> path = "README.md"
...> file = Ash.Type.File.from_path(path)
...> Ash.Type.File.path(file)
{:ok, "README.md"}

prepare_change?()