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A declarative, extensible framework for building Elixir applications.

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ash lib ash resource validation changing.ex
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lib/ash/resource/validation/changing.ex

defmodule Ash.Resource.Validation.Changing do
@moduledoc false
use Ash.Resource.Validation
import Ash.Changeset
alias Ash.Error.Changes.InvalidAttribute
defmodule Opts do
@moduledoc false
use Spark.Options.Validator,
schema: [
field: [
type: :atom,
required: true,
doc:
"The attribute or relationship to check for changes. Using a relationship does not compare old and new value, returning `true` if the value is being touched)"
],
touching?: [
type: :atom,
required: false,
default: false,
doc:
"Whether to consider a field as changing if it is just being touched (i.e consider it changed even if it is being changed to its current value)"
]
]
end
@default_error_message "must be changing"
@impl Ash.Resource.Validation
def init(opts) do
case Opts.validate(opts) do
{:ok, opts} ->
{:ok, Opts.to_options(opts)}
{:error, error} ->
{:error, Exception.message(error)}
end
end
@impl Ash.Resource.Validation
def validate(changeset, opts, context) do
if field_is_changing?(changeset, Keyword.fetch!(opts, :field), opts[:touching?]),
do: :ok,
else: {:error, exception(opts, context)}
end
defp field_is_changing?(changeset, field, true) do
case Ash.Resource.Info.relationship(changeset.resource, field) do
nil ->
Map.has_key?(changeset.casted_attributes, field) ||
Map.has_key?(changeset.attributes, field) || Keyword.has_key?(changeset.atomics, field)
%{type: :belongs_to} = relationship ->
Map.has_key?(changeset.casted_attributes, field) ||
Map.has_key?(changeset.attributes, field) || Keyword.has_key?(changeset.atomics, field) ||
changing_relationship?(changeset, relationship.name)
relationship ->
changing_relationship?(changeset, relationship.name)
end
end
defp field_is_changing?(changeset, field, _) do
case Ash.Resource.Info.relationship(changeset.resource, field) do
nil ->
changing_attribute?(changeset, field)
%{type: :belongs_to} = relationship ->
changing_attribute?(changeset, relationship.source_attribute) ||
changing_relationship?(changeset, relationship.name)
relationship ->
changing_relationship?(changeset, relationship.name)
end
end
@impl Ash.Resource.Validation
def atomic(changeset, opts, context) do
if opts[:touching?] do
validate(changeset, opts, context)
else
case atomic_field(changeset, Keyword.fetch!(opts, :field)) do
{:changing, field} ->
{:atomic, [field], expr(^atomic_ref(field) == ^ref(field)),
expr(
error(^InvalidAttribute, %{
field: ^field,
value: ^atomic_ref(field),
message: ^(context.message || @default_error_message),
vars: %{field: ^field}
})
)}
{:not_changing, _field} ->
{:error, exception(opts, context)}
{:not_atomic, field} ->
{:not_atomic, "can't atomically check if #{field} relationship is changing"}
end
end
end
defp atomic_field(changeset, field) do
changeset.resource
|> Ash.Resource.Info.relationship(field)
|> case do
nil -> {:atomic, field}
%{type: :belongs_to} = relationship -> {:atomic, relationship.source_attribute}
_relationship -> {:not_atomic, field}
end
|> atomic_result(changeset)
end
defp atomic_result({:atomic, field}, changeset) do
msg =
if changing_attribute?(changeset, field),
do: :changing,
else: :not_changing
{msg, field}
end
defp atomic_result(not_atomic, _changeset), do: not_atomic
@impl Ash.Resource.Validation
def describe(_opts), do: [message: @default_error_message, vars: []]
defp exception(opts, context) do
[field: opts[:field]]
|> with_description(opts)
|> maybe_use_context_message(context.message)
|> InvalidAttribute.exception()
end
defp maybe_use_context_message(opts, nil), do: opts
defp maybe_use_context_message(opts, message) do
Keyword.put(opts, :message, message)
end
end