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ash

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A declarative, extensible framework for building Elixir applications.

Security advisory: This version has known vulnerabilities. View advisories

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ash lib ash data_layer simple simple.ex
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lib/ash/data_layer/simple/simple.ex

defmodule Ash.DataLayer.Simple do
@moduledoc """
A data layer that simply returns structs
This is the data layer that is used under the hood
by embedded resources, and resources without data layers.
"""
use Spark.Dsl.Extension, transformers: [], sections: []
@doc false
def can?(_, :create), do: true
def can?(_, :update), do: true
def can?(_, :destroy), do: true
def can?(_, :sort), do: true
def can?(_, :limit), do: true
def can?(_, {:sort, _}), do: true
def can?(_, :filter), do: true
def can?(_, :boolean_filter), do: true
def can?(_, :nested_expressions), do: true
def can?(_, {:filter_expr, _}), do: true
def can?(_, :multitenancy), do: true
def can?(_, _), do: false
defmodule Query do
@moduledoc false
defstruct [:data, :resource, :filter, :api, :limit, sort: [], data_set?: false]
end
@doc """
Sets the data for a query against a data-layer-less resource
"""
def set_data(query, data) do
Ash.Query.put_context(query, :data, data)
end
@doc false
def resource_to_query(resource, api) do
%Query{data: [], resource: resource, api: api}
end
@doc false
def run_query(%{data_set?: false}, resource) do
{:error,
Ash.Error.SimpleDataLayer.NoDataProvided.exception(
message:
"No data provided to resource #{resource}\nA common cause of this is not having a data layer for the resource.\n\nYou can create a data layer by including the following in your resource:\n`use Ash.Resource, data_layer: Ash.DataLayer.Ets`"
)}
end
def run_query(%{data: data, sort: sort, api: api, filter: filter, limit: limit}, _resource) do
{:ok,
data
|> Enum.filter(&Ash.Filter.Runtime.matches?(api, &1, filter))
|> Ash.Actions.Sort.runtime_sort(sort)
|> then(fn data ->
if limit do
Enum.take(data, limit)
else
data
end
end)}
end
@doc false
def limit(query, limit, _) do
{:ok, %{query | limit: limit}}
end
@doc false
def set_tenant(_, query, _), do: {:ok, query}
@doc false
def filter(query, filter, _resource) do
{:ok, %{query | filter: filter}}
end
@doc false
def sort(query, sort, _resource) do
{:ok, %{query | sort: sort}}
end
@doc false
def set_context(_resource, query, context) do
case Map.fetch(context, :data) do
{:ok, value} ->
{:ok, %{query | data_set?: true, data: value || []}}
:error ->
{:ok, query}
end
end
@doc false
def create(_resource, changeset) do
Ash.Changeset.apply_attributes(changeset)
end
@doc false
def update(_resource, changeset) do
Ash.Changeset.apply_attributes(changeset)
end
@doc false
def destroy(_resource, _changeset) do
:ok
end
end