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absinthe lib absinthe phase document arguments data.ex
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lib/absinthe/phase/document/arguments/data.ex

defmodule Absinthe.Phase.Document.Arguments.Data do
@moduledoc false
# Populate all arguments in the document with their provided data values:
#
# - If valid data is available for an argument, set the `Argument.t`'s
# `data_value` field to that value.
# - If no valid data is available for an argument, set the `Argument.t`'s
# `data_value` to `nil`.
# - When determining the value of the argument, mark any invalid nodes
# in the `Argument.t`'s `normalized_value` tree with `:invalid` and a
# reason.
# - If non-null arguments are not provided (eg, a `Argument.t` is missing
# from `normalized_value`), add a stub `Argument.t` and flag it as
# `:invalid` and `:missing`.
# - If non-null input fields are not provided (eg, an `Input.Field.t` is
# missing from `normalized_value`), add a stub `Input.Field.t` and flag it as
# `:invalid` and `:missing`.
#
# Note that the limited validation that occurs in this phase is limited to
# setting the `data_value` to `nil`, adding flags to the `normalized_value`,
# and building stub fields/arguments when missing values are required. Actual
# addition of errors is handled by validation phases.
alias Absinthe.Blueprint.Input
alias Absinthe.{Blueprint}
use Absinthe.Phase
def run(input, _options \\ []) do
# By using a postwalk we can worry about leaf nodes first (scalars, enums),
# and then for list and objects merely grab the data values.
result = Blueprint.postwalk(input, &handle_node/1)
{:ok, result}
end
def handle_node(%Blueprint.Document.Field{arguments: []} = node) do
node
end
def handle_node(%Blueprint.Document.Field{arguments: args} = node) do
%{node | argument_data: Input.Argument.value_map(args)}
end
def handle_node(%Input.Argument{input_value: input} = node) do
%{node | value: input.data}
end
def handle_node(%Input.Value{normalized: %Input.List{items: items}} = node) do
data_list = for %{data: data} = item <- items, Input.Value.valid?(item), do: data
%{node | data: data_list}
end
def handle_node(%Input.Value{normalized: %Input.Object{fields: fields}} = node) do
data =
for field <- fields, include_field?(field), into: %{} do
{field.schema_node.__reference__.identifier, field.input_value.data}
end
%{node | data: data}
end
def handle_node(node) do
node
end
defp include_field?(%{input_value: %{normalized: %Input.Null{}}}), do: true
defp include_field?(%{input_value: %{data: nil}}), do: false
defp include_field?(_), do: true
end