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A declarative, extensible framework for building Elixir applications.

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ash lib ash resource attribute.ex
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lib/ash/resource/attribute.ex

defmodule Ash.Resource.Attribute do
@moduledoc "Represents an attribute on a resource"
defstruct [
:name,
:type,
:allow_nil?,
:generated?,
:primary_key?,
:private?,
:writable?,
:always_select?,
:default,
:update_default,
:description,
sensitive?: false,
constraints: []
]
@type t :: %__MODULE__{
name: atom(),
constraints: Keyword.t(),
type: Ash.Type.t(),
primary_key?: boolean(),
private?: boolean(),
default: (() -> term),
update_default: (() -> term) | (Ash.Resource.record() -> term),
sensitive?: boolean(),
writable?: boolean()
}
alias Ash.OptionsHelpers
@schema [
name: [
type: :atom,
doc: "The name of the attribute."
],
type: [
type: :any,
doc: "The type of the attribute."
],
constraints: [
type: :keyword_list,
doc:
"Constraints to provide to the type when casting the value. See the type's documentation for more information."
],
sensitive?: [
type: :boolean,
default: false,
doc:
"Whether or not the attribute value contains sensitive information, like PII. If so, it will be redacted while inspecting data."
],
always_select?: [
type: :boolean,
default: false,
doc: """
Whether or not to always select this attribute when reading from the database.
Useful if fields are used in read action preparations consistently.
A primary key attribute *cannot be deselected*, so this option will have no effect.
Generally, you should favor selecting the field that you need while running your preparation. For example:
```elixir
defmodule MyApp.QueryPreparation.Thing do
use Ash.Resource.Preparation
def prepare(query, _, _) do
query
|> Ash.Query.select(:attribute_i_need)
|> Ash.Query.after_action(fn query, results ->
{:ok, Enum.map(results, fn result ->
do_something_with_attribute_i_need(result)
end)}
end)
end
end
```
This will prevent unnecessary fields from being selected.
"""
],
primary_key?: [
type: :boolean,
default: false,
doc:
"Whether or not the attribute is part of the primary key (one or more fields that uniquely identify a resource). " <>
"If primary_key? is true, allow_nil? must be false."
],
allow_nil?: [
type: :boolean,
default: true,
doc: "Whether or not the attribute can be set to nil."
],
generated?: [
type: :boolean,
default: false,
doc:
"Whether or not the value may be generated by the data layer. If it is, the data layer will know to read the value back after writing."
],
writable?: [
type: :boolean,
default: true,
doc: "Whether or not the value can be written to."
],
private?: [
type: :boolean,
default: false,
doc:
"Whether or not the attribute will appear in any interfaces created off of this resource, e.g AshJsonApi and AshGraphql."
],
update_default: [
type: {:custom, Ash.OptionsHelpers, :default, []},
doc:
"A zero argument function, an {mod, fun, args} triple or a value. `Ash.Changeset.for_update/4` sets the default in the changeset if a value is not provided."
],
default: [
type: {:custom, Ash.OptionsHelpers, :default, []},
doc:
"A zero argument function, an {mod, fun, args} triple or a value. `Ash.Changeset.for_create/4` sets the default in the changeset if a value is not provided."
],
description: [
type: :string,
doc: "An optional description for the attribute."
]
]
@create_timestamp_schema @schema
|> OptionsHelpers.set_default!(:writable?, false)
|> OptionsHelpers.set_default!(:private?, true)
|> OptionsHelpers.set_default!(:default, &DateTime.utc_now/0)
|> OptionsHelpers.set_default!(:type, Ash.Type.UtcDatetimeUsec)
|> OptionsHelpers.set_default!(:allow_nil?, false)
@update_timestamp_schema @schema
|> OptionsHelpers.set_default!(:writable?, false)
|> OptionsHelpers.set_default!(:private?, true)
|> OptionsHelpers.set_default!(:default, &DateTime.utc_now/0)
|> OptionsHelpers.set_default!(
:update_default,
&DateTime.utc_now/0
)
|> OptionsHelpers.set_default!(:type, Ash.Type.UtcDatetimeUsec)
|> OptionsHelpers.set_default!(:allow_nil?, false)
@uuid_primary_key_schema @schema
|> OptionsHelpers.set_default!(:writable?, false)
|> OptionsHelpers.set_default!(:default, &Ash.UUID.generate/0)
|> OptionsHelpers.set_default!(:primary_key?, true)
|> OptionsHelpers.set_default!(:type, Ash.Type.UUID)
|> Keyword.delete(:allow_nil?)
@integer_primary_key_schema @schema
|> OptionsHelpers.set_default!(:writable?, false)
|> OptionsHelpers.set_default!(:primary_key?, true)
|> OptionsHelpers.set_default!(:generated?, true)
|> OptionsHelpers.set_default!(:type, Ash.Type.Integer)
|> Keyword.delete(:allow_nil?)
@doc false
def attribute_schema, do: @schema
def create_timestamp_schema, do: @create_timestamp_schema
def update_timestamp_schema, do: @update_timestamp_schema
def uuid_primary_key_schema, do: @uuid_primary_key_schema
def integer_primary_key_schema, do: @integer_primary_key_schema
end