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A declarative, extensible framework for building Elixir applications.

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ash lib ash filter runtime.ex
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lib/ash/filter/runtime.ex

defmodule Ash.Filter.Runtime do
@moduledoc """
Checks a record to see if it matches a filter statement.
We can't always tell if a record matches a filter statement, and as such
this function may return `:unknown`
"""
alias Ash.Query.{Expression, Not, Ref}
@doc """
Checks if a record matches a filter, side loading any necessary relationships"
If it can't tell, this returns false.
"""
def matches?(api, record, filter, dirty_fields \\ []) do
case matches(record, filter, dirty_fields) do
{:ok, boolean} ->
boolean
{:side_load, side_loads} when not is_nil(api) ->
matches?(api, api.load!(record, side_loads), filter, dirty_fields)
{:side_load, _} ->
false
:unknown ->
false
end
end
def matches(record, filter, dirty_fields, side_loads \\ [])
def matches(record, expression, dirty_fields, side_loads) do
case expression do
%Ash.Filter{expression: expression} ->
matches(record, expression, dirty_fields, side_loads)
nil ->
{:ok, true}
boolean when is_boolean(boolean) ->
{:ok, boolean}
%op{__operator__?: true, left: left, right: right} = operator ->
with true <- :erlang.function_exported(op, :match?, 1),
{:dirty?, false} <- {:dirty?, dirty?([left, right], dirty_fields)},
{:side_load, []} <- {:side_load, need_to_load([left, right], record)} do
case right do
%Ref{} ->
{:ok,
right
|> resolve_ref(record)
|> List.wrap()
|> Enum.any?(fn right_resolved ->
left
|> resolve_ref(record)
|> List.wrap()
|> Enum.any?(fn left_resolved ->
op.evaluate(%{operator | left: left_resolved, right: right_resolved})
end)
end)}
_ ->
{:ok,
left
|> resolve_ref(record)
|> Enum.any?(fn left_resolved ->
op.evaluate(%{operator | left: left_resolved, right: right})
end)}
end
else
false ->
:unknown
{:side_load, paths} ->
{:side_load, paths}
{:dirty?, true} ->
:unknown
end
%func{__function__?: true, arguments: arguments} = function ->
with true <- :erlang.function_exported(func, :match?, 1),
{:dirty?, false} <- {:dirty?, dirty?(arguments, dirty_fields)},
{:side_load, []} <- {:side_load, need_to_load(arguments, record)} do
{:ok,
arguments
|> Enum.map(&resolve_ref(&1, record))
|> unique_calls()
|> Enum.any?(fn args ->
func.evaluate(%{function | arguments: args})
end)}
else
false ->
:unknown
{:side_load, paths} ->
{:side_load, paths}
{:dirty?, true} ->
:unknown
end
%Not{expression: expression} ->
case matches(record, expression, dirty_fields, side_loads) do
:unknown ->
:unknown
{:ok, match?} ->
{:ok, !match?}
{:side_load, side_loads} ->
{:side_load, side_loads}
end
%Expression{op: op, left: left, right: right} ->
expression_matches(op, left, right, record, dirty_fields, side_loads)
end
end
defp unique_calls([arg_values | rest]) do
Enum.map(arg_values, fn value ->
rest
|> unique_calls()
|> Enum.map(fn call ->
[value | call]
end)
end)
end
defp unique_calls([]), do: []
defp resolve_ref(%Ref{relationship_path: [], attribute: %{name: name}}, record) do
[Map.get(record, name)]
end
defp resolve_ref(%Ref{attribute: %{name: name}, relationship_path: path}, record) do
record
|> get_related(path)
|> Enum.map(&Map.get(&1, name))
end
defp resolve_ref(value, _record), do: value
defp dirty?(fields, dirty) do
dirty = dirty || []
fields
|> Enum.filter(&ref?/1)
|> Enum.filter(&(&1.relationship_path == []))
|> Enum.any?(&(&1.attribute.name in dirty))
end
defp need_to_load(fields, record) do
fields
|> Enum.filter(&ref?/1)
|> Enum.filter(&(&1.relationship_path != []))
|> Enum.reject(&loaded?(record, &1.relationship_path))
|> Enum.map(& &1.relationship_path)
|> Enum.map(fn path ->
path_to_side_load(path)
end)
end
defp path_to_side_load([first]), do: first
defp path_to_side_load([first | rest]) do
{first, [path_to_side_load(rest)]}
end
defp ref?(%Ash.Query.Ref{}), do: true
defp ref?(_), do: false
defp expression_matches(:and, left, right, record, dirty_fields, side_loads) do
case matches(record, left, dirty_fields, side_loads) do
{:ok, true} ->
matches(record, right, dirty_fields, side_loads)
:unknown ->
:unknown
{:ok, false} ->
{:ok, false}
{:side_load, side_loads} ->
matches(record, right, dirty_fields, side_loads)
end
end
defp expression_matches(:or, left, right, record, dirty_fields, side_loads) do
case matches(record, left, dirty_fields, side_loads) do
{:ok, true} ->
{:ok, true}
:unknown ->
case matches(record, right, dirty_fields, side_loads) do
{:ok, false} -> {:ok, :unknown}
other -> other
end
{:ok, false} ->
matches(record, right, dirty_fields, side_loads)
{:side_load, side_loads} ->
matches(record, right, dirty_fields, side_loads)
end
end
defp get_related(record, path) when not is_list(record) do
get_related([record], path)
end
defp get_related(records, []) do
records
end
defp get_related(records, [key | rest]) when is_list(records) do
Enum.flat_map(records, fn record ->
case Map.get(record, key) do
%Ash.NotLoaded{type: :relationship} ->
[]
value ->
get_related(value, rest)
end
end)
end
defp loaded?(records, path) when is_list(records) do
Enum.all?(records, &loaded?(&1, path))
end
defp loaded?(%Ash.NotLoaded{}, _), do: false
defp loaded?(_, []), do: true
defp loaded?(record, [key | rest]) do
record
|> Map.get(key)
|> loaded?(rest)
end
end