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A declarative, extensible framework for building Elixir applications.

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ash lib ash resource actions read.ex
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lib/ash/resource/actions/read.ex

defmodule Ash.Resource.Actions.Read do
@moduledoc "Represents a read action on a resource."
defstruct arguments: [],
description: nil,
filter: nil,
get_by: nil,
get?: nil,
manual: nil,
metadata: [],
modify_query: nil,
name: nil,
pagination: nil,
preparations: [],
primary?: nil,
touches_resources: [],
transaction?: false,
type: :read
@type t :: %__MODULE__{
arguments: [Ash.Resource.Actions.Argument.t()],
description: String.t() | nil,
filter: any,
get_by: nil | [atom],
get?: nil | boolean,
manual: atom | {atom, Keyword.t()} | nil,
metadata: [Ash.Resource.Actions.Metadata.t()],
modify_query: nil | mfa,
name: atom,
pagination: any,
primary?: boolean,
touches_resources: [atom],
transaction?: boolean,
type: :read
}
import Ash.Resource.Actions.SharedOptions
@global_opts shared_options()
@opt_schema Spark.OptionsHelpers.merge_schemas(
[
filter: [
type: :any,
doc:
"A filter template that will be applied whenever the action is used. See `Ash.Filter` for more on templates"
],
manual: [
type:
{:spark_function_behaviour, Ash.Resource.ManualRead,
{Ash.Resource.ManualRead.Function, 3}},
doc: """
Delegates running of the query to the provided module.
Accepts a module or module and opts, or a function that takes the changeset and context.
See the [manual actions guide](/documentation/topics/manual-actions.md) for more.
"""
],
get?: [
type: :boolean,
default: false,
doc: """
Expresses that this action innately only returns a single result. Can be used by extensions to validate that you have not hooked something up that expects a list
to an action that can only return one thing. Used by the code interface when defining functions for read actions.
See the [code interface guide](/documentation/topics/code-interface.md) for more.
"""
],
modify_query: [
type: {:or, [:mfa, {:fun, 2}]},
doc: """
Allows direct manipulation of the data layer query via an MFA.
The ash query and the data layer query will be provided as additional arguments.
The result must be `{:ok, new_data_layer_query} | {:error, error}`.
Here be dragons.
"""
],
get_by: [
type: {:or, [:atom, {:list, :atom}]},
default: nil,
doc: """
A helper to automatically generate a "get by X" action.
Using this option will set `get?` to true, add arguments
for each of the specified fields, and add a filter to the
underlying query for each of the arguments.
"""
]
],
@global_opts,
"Action Options"
)
@pagination_schema [
keyset?: [
type: :boolean,
doc: "Whether or not keyset based pagination is supported",
default: false
],
offset?: [
type: :boolean,
doc: "Whether or not offset based pagination is supported",
default: false
],
default_limit: [
type: :pos_integer,
doc: "The default page size to apply, if one is not supplied"
],
countable: [
type: {:in, [true, false, :by_default]},
doc:
"Whether not a returned page will have a full count of all records. Use `:by_default` to do it automatically.",
default: false
],
max_page_size: [
type: :pos_integer,
doc: "The maximum amount of records that can be requested in a single page",
default: 250
],
required?: [
type: :boolean,
doc:
"Whether or not pagination can be disabled. Only relevant if some pagination configuration is supplied.",
default: true
]
]
defmodule Pagination do
@moduledoc "Represents the pagination configuration of a read action"
defstruct [
:default_limit,
:max_page_size,
countable: false,
required?: false,
keyset?: false,
offset?: false
]
@type t :: %__MODULE__{}
def transform(pagination) do
if pagination.keyset? or pagination.offset? do
{:ok, pagination}
else
{:error, "Must enable `keyset?` or `offset?`"}
end
end
end
def transform(read) do
if read.pagination do
if is_list(read.pagination) do
{:ok, %{read | pagination: List.last(read.pagination) || false}}
else
{:ok, %{read | pagination: read.pagination}}
end
else
{:ok, %{read | pagination: false}}
end
end
@doc false
def opt_schema, do: @opt_schema
def pagination_schema, do: @pagination_schema
end