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A declarative, extensible framework for building Elixir applications.

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ash lib ash resource calculation calculation.ex
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lib/ash/resource/calculation/calculation.ex

defmodule Ash.Resource.Calculation do
@moduledoc """
The behaviour for defining a module calculation, and the struct for storing a defined calculation.
"""
require Ash.BehaviourHelpers
defstruct allow_nil?: true,
arguments: [],
calculation: nil,
constraints: [],
description: nil,
filterable?: true,
sortable?: true,
load: [],
name: nil,
public?: false,
async?: false,
sensitive?: false,
type: nil,
__spark_metadata__: nil
@schema [
name: [
type: :atom,
required: true,
doc: "The field name to use for the calculation value"
],
type: [
type: :any,
doc: "The type of the calculation. See `Ash.Type` for more.",
required: true
],
async?: [
type: :boolean,
default: false
],
constraints: [
type: :keyword_list,
default: [],
doc: "Constraints to provide to the type. See `Ash.Type` for more."
],
calculation: [
type: Ash.OptionsHelpers.calculation_type(),
required: true,
doc: """
The `module`, `{module, opts}` or `expr(...)` to use for the calculation. Also accepts a function that takes *a list of records* and the context, and produces a result for each record.
"""
],
description: [
type: :string,
doc: "An optional description for the calculation"
],
public?: [
type: :boolean,
default: false,
doc: """
Whether or not the calculation will appear in public interfaces.
"""
],
sensitive?: [
type: :boolean,
default: false,
doc: """
Whether or not references to the calculation will be considered sensitive.
"""
],
load: [
type: :any,
default: [],
doc: "A load statement to be applied if the calculation is used."
],
allow_nil?: [
type: :boolean,
default: true,
doc: "Whether or not the calculation can return nil."
],
filterable?: [
type: {:or, [:boolean, {:in, [:simple_equality]}]},
default: true,
doc: "Whether or not the calculation should be usable in filters."
],
sortable?: [
type: :boolean,
default: true,
doc: """
Whether or not the calculation can be referenced in sorts.
"""
]
]
defmodule Context do
@moduledoc """
The context and arguments of a calculation
"""
defstruct [
:actor,
:tenant,
:authorize?,
:tracer,
:domain,
:resource,
:type,
:constraints,
:arguments,
source_context: %{}
]
@type t :: %__MODULE__{
actor: term | nil,
tenant: term(),
authorize?: boolean,
tracer: module | nil,
source_context: map(),
resource: module(),
type: Ash.Type.t(),
constraints: Keyword.t(),
domain: module(),
arguments: map()
}
end
@type t :: %__MODULE__{
allow_nil?: boolean,
arguments: [__MODULE__.Argument.t()],
calculation: module | {module, keyword},
constraints: keyword,
async?: boolean,
description: nil | String.t(),
filterable?: boolean,
load: keyword,
sortable?: boolean,
name: atom(),
public?: boolean,
type: nil | Ash.Type.t(),
__spark_metadata__: Spark.Dsl.Entity.spark_meta()
}
@type ref :: {module(), Keyword.t()} | module()
defmacro __using__(_) do
quote do
@behaviour Ash.Resource.Calculation
@before_compile Ash.Resource.Calculation
import Ash.Expr
def init(opts), do: {:ok, opts}
def describe(opts), do: "##{inspect(__MODULE__)}<#{inspect(opts)}>"
def load(_query, _opts, _context), do: []
defoverridable init: 1, describe: 1, load: 3
end
end
defmacro __before_compile__(_) do
quote do
if Module.defines?(__MODULE__, {:expression, 2}) do
def has_expression?, do: true
else
def has_expression?, do: false
end
if Module.defines?(__MODULE__, {:calculate, 3}) do
def has_calculate?, do: true
else
def has_calculate?, do: false
end
def strict_loads?, do: true
defoverridable strict_loads?: 0
end
end
@type opts :: Keyword.t()
@callback init(opts :: opts) :: {:ok, opts} | {:error, term}
@callback describe(opts :: opts) :: String.t()
@callback calculate(records :: [Ash.Resource.record()], opts :: opts, context :: Context.t()) ::
{:ok, [term]} | [term] | {:error, term} | :unknown
@callback expression(opts :: opts, context :: Context.t()) :: any
@callback load(query :: Ash.Query.t(), opts :: opts, context :: Context.t()) ::
atom | [atom] | Keyword.t()
@callback strict_loads?() :: boolean()
@callback has_expression?() :: boolean()
@optional_callbacks expression: 2, calculate: 3
def schema, do: @schema
@spec init(module(), opts) :: {:ok, opts} | {:error, term}
def init(module, opts) do
Ash.BehaviourHelpers.check_type!(module, module.init(opts), [
{:ok, opts},
{:error, error}
])
end
@doc false
def expr_calc(expr) when is_function(expr) do
{:error,
"Inline function calculations expect a function with arity 2. Got #{Function.info(expr)[:arity]}"}
end
def expr_calc(expr) do
{:ok, {Ash.Resource.Calculation.Expression, expr: expr}}
end
end