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A declarative, extensible framework for building Elixir applications.

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ash lib ash type type.ex
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lib/ash/type/type.ex

defmodule Ash.Type do
@moduledoc """
This behaviour is a superset of the Ecto.Type behavior, that also contains
api level information, like what kinds of filters are allowed. Eventually,
this may be used for composite types or serialization.
Much better to `use Ash.Type` than to say `@behaviour Ash.Type` and define
everything yourself.
"""
@callback supported_filter_types(Ash.data_layer()) :: list(atom)
@callback sortable?(Ash.data_layer()) :: boolean
@callback storage_type() :: Ecto.Type.t()
@callback ecto_type() :: Ecto.Type.t()
@callback cast_input(term) :: {:ok, term} | {:error, keyword()} | :error
@callback cast_stored(term) :: {:ok, term} | :error
@callback dump_to_native(term) :: {:ok, term} | :error
@callback equal?(term, term) :: boolean
@callback describe() :: String.t()
@builtins [
string: [ecto_type: :string, filters: [:eq, :in, :not_eq, :not_in], sortable?: true],
integer: [ecto_type: :integer, filters: [:eq, :in, :not_eq, :not_in], sortable?: true],
boolean: [ecto_type: :boolean, filters: [:eq, :not_eq], sortable?: true],
int: [ecto_type: :integer, filters: [:eq, :in, :not_eq, :not_in], sortable?: true],
uuid: [ecto_type: :binary_id, filters: [:eq, :in, :not_eq, :not_in], sortable?: true],
date: [ecto_type: :date, filters: [:eq, :in, :not_eq, :not_in], sortable?: true],
utc_datetime: [
ecto_type: :utc_datetime,
filters: [:eq, :in, :not_eq, :not_in],
sortable?: true
]
]
@short_names [
atom: Ash.Type.Atom,
term: Ash.Type.Term
]
@builtin_names Keyword.keys(@builtins)
@type t :: module | atom
@spec get_type(atom | module) :: atom | module
def get_type(value) when is_atom(value) do
case Keyword.fetch(@short_names, value) do
{:ok, mod} -> mod
:error -> value
end
end
def get_type(value) do
value
end
@doc """
Determines whether or not this value can be sorted.
"""
@spec sortable?(t, Ash.data_layer()) :: boolean
def sortable?(type, _data_layer) when type in @builtin_names do
@builtins[type][:sortable?]
end
def sortable?(type, data_layer), do: type.sortable?(data_layer)
@doc """
Returns the *underlying* storage type (the underlying type of the *ecto type* of the *ash type*)
"""
@spec storage_type(t()) :: Ecto.Type.t()
def storage_type(type) when type in @builtin_names, do: type
def storage_type(type), do: type.storage_type()
@doc """
Returns the ecto compatible type for an Ash.Type.
If you `use Ash.Type`, this is created for you. For builtin types
this may return a corresponding ecto builtin type (atom)
"""
@spec ecto_type(t) :: Ecto.Type.t()
for {name, builtin} <- @builtins do
def ecto_type(unquote(name)), do: unquote(builtin[:ecto_type])
end
for {name, mod} <- @short_names do
def ecto_type(unquote(name)), do: ecto_type(unquote(mod))
end
def ecto_type(type) do
type.ecto_type()
end
@doc "A list of the built in type names"
@spec builtins :: list(atom)
def builtins, do: @builtin_names
@spec ash_type?(term) :: boolean
@doc "Returns true if the value is a builtin type or adopts the `Ash.Type` behaviour"
def ash_type?(atom) when atom in @builtin_names, do: true
def ash_type?(module) when is_atom(module) do
case Code.ensure_compiled(module) do
{:module, _} -> ash_type_module?(module)
_ -> false
end
end
def ash_type?(_), do: false
@doc """
Casts input (e.g. unknown) data to an instance of the type, or errors
Maps to `Ecto.Type.cast/2`
"""
@spec cast_input(t(), term) :: {:ok, term} | {:error, keyword()} | :error
def cast_input(type, term) when type in @builtin_names do
Ecto.Type.cast(@builtins[type][:ecto_type], term)
end
def cast_input(type, term) do
type.cast_input(term)
end
@doc """
Casts a value from the data store to an instance of the type, or errors
Maps to `Ecto.Type.load/2`
"""
@spec cast_stored(t(), term) :: {:ok, term} | {:error, keyword()} | :error
def cast_stored(type, term) when type in @builtin_names do
Ecto.Type.load(@builtins[type][:ecto_type], term)
end
def cast_stored(type, term) do
type.cast_stored(term)
end
@doc """
Casts a value from the Elixir type to a value that the data store can persist
Maps to `Ecto.Type.dump/2`
"""
@spec dump_to_native(t(), term) :: {:ok, term} | {:error, keyword()} | :error
def dump_to_native(type, term) when type in @builtin_names do
Ecto.Type.dump(@builtins[type][:ecto_type], term)
end
def dump_to_native(type, term) do
type.dump_to_native(term)
end
@doc """
Determines if two values of a given type are equal.
Maps to `Ecto.Type.equal?/3`
"""
@spec equal?(t(), term, term) :: boolean
def equal?(type, left, right) when type in @builtin_names do
Ecto.Type.equal?(@builtins[type][:ecto_type], left, right)
end
def equal?(type, left, right) do
type.equal?(left, right)
end
# @callback equal?(term, term) :: boolean
defmacro __using__(_) do
quote location: :keep do
@behaviour Ash.Type
parent = __MODULE__
defmodule EctoType do
@moduledoc false
@behaviour Ecto.Type
@parent parent
@impl true
def type do
@parent.storage_type()
end
@impl true
def cast(term) do
@parent.cast_input(term)
end
@impl true
def load(term) do
@parent.cast_stored(term)
end
@impl true
def dump(term) do
@parent.dump_to_native(term)
end
@impl true
def equal?(left, right) do
@parent.equal?(left, right)
end
@impl true
def embed_as(_), do: :self
end
@impl true
def ecto_type, do: EctoType
@impl true
def supported_filter_types(_data_layer), do: [:equal, :in]
@impl true
def sortable?(_data_layer), do: true
@impl true
def equal?(left, right), do: left == right
defoverridable supported_filter_types: 1, equal?: 2, sortable?: 1
end
end
defp ash_type_module?(module) do
Ash.implements_behaviour?(module, __MODULE__)
end
end