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lib/absinthe/phase/document/validation/unique_input_field_names.ex
defmodule Absinthe.Phase.Document.Validation.UniqueInputFieldNames do
@moduledoc false
# Validates document to ensure that all input fields 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
# Find input objects
@spec handle_node(Blueprint.node_t) :: Blueprint.node_t
defp handle_node(%{normalized: %Blueprint.Input.Object{} = node} = parent) do
fields = Enum.map(node.fields, &process(&1, node.fields))
node = %{node | fields: fields}
%{parent | normalized: node}
end
defp handle_node(node) do
node
end
# Check an input field, finding any duplicates
@spec process(Blueprint.Input.Field.t, [Blueprint.Input.Field.t]) :: Blueprint.Input.Field.t
defp process(field, fields) do
check_duplicates(field, Enum.filter(fields, &(&1.name == field.name)))
end
# Add flags and errors if necessary for each input field
@spec check_duplicates(Blueprint.Input.Field.t, [Blueprint.Input.Field.t]) :: Blueprint.Input.Field.t
defp check_duplicates(field, [_single]) do
field
end
defp check_duplicates(field, _multiple) do
field
|> flag_invalid(:duplicate_name)
|> put_error(error(field))
end
# Generate an error for an input field
@spec error(Blueprint.Input.Field.t) :: Phase.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 input field name."
end
end