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lib/absinthe/phase/document/validation/provided_non_null_arguments.ex
defmodule Absinthe.Phase.Document.Validation.ProvidedNonNullArguments do
@moduledoc false
# Validates document to ensure that all non-null arguments are provided.
alias Absinthe.{Blueprint, Phase, Schema, Type}
use Absinthe.Phase
@doc """
Run the validation.
"""
@spec run(Blueprint.t, Keyword.t) :: Phase.result_t
def run(input, _options \\ []) do
result = Blueprint.prewalk(input, &(handle_node(&1, input.schema)))
{:ok, result}
end
# Find the missing arguments
@spec handle_node(Blueprint.node_t, Schema.t) :: Blueprint.node_t
defp handle_node(%Blueprint.Input.Argument{value: nil, flags: %{missing: _}} = node, schema) do
node = node |> put_error(error(node, node.schema_node.type, schema))
{:halt, node}
end
defp handle_node(node, _) do
node
end
# Generate the error for this validation
@spec error(Blueprint.node_t, Type.t, Schema.t) :: Phase.Error.t
defp error(node, type, schema) do
type_name = Type.name(type, schema)
Phase.Error.new(
__MODULE__,
error_message(node.name, type_name),
node.source_location
)
end
@doc """
Generate the argument error.
"""
@spec error_message(String.t, String.t) :: String.t
def error_message(name, type_name) do
~s(In argument "#{name}": Expected type "#{type_name}", found null.)
end
end