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lib/absinthe/phase/document/validation/unique_argument_names.ex
defmodule Absinthe.Phase.Document.Validation.UniqueArgumentNames do
@moduledoc false
# Validates document to ensure that all arguments for a field or directive
# have unique names.
alias Absinthe.{Blueprint, Phase}
use Absinthe.Phase
use Absinthe.Phase.Validation
@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)
{:ok, result}
end
@argument_hosts [
Blueprint.Document.Field,
Blueprint.Directive
]
# Find fields and directives to check arguments
@spec handle_node(Blueprint.node_t) :: Blueprint.node_t
defp handle_node(%argument_host{} = node) when argument_host in @argument_hosts do
arguments = Enum.map(node.arguments, &(process(&1, node.arguments)))
%{node | arguments: arguments}
end
defp handle_node(node) do
node
end
# Check an argument, finding any duplicates
@spec process(Blueprint.Input.Argument.t, [Blueprint.Input.Argument.t]) :: Blueprint.Input.Argument.t
defp process(argument, arguments) do
check_duplicates(argument, Enum.filter(arguments, &(&1.name == argument.name)))
end
# Add flags and errors if necessary for each argument.
@spec check_duplicates(Blueprint.Input.Argument.t, [Blueprint.Input.Argument.t]) :: Blueprint.Input.Argument.t
defp check_duplicates(argument, [_single]) do
argument
end
defp check_duplicates(argument, _multiple) do
argument
|> flag_invalid(:duplicate_name)
|> put_error(error(argument))
end
# Generate an error for a duplicate argument.
@spec error(Blueprint.Input.Argument.t) :: Phase.Error.t
defp error(node) do
Phase.Error.new(
__MODULE__,
error_message(),
location: node.source_location
)
end
@doc """
Generate the error message.
"""
@spec error_message :: String.t
def error_message do
"Duplicate argument name."
end
end