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lib/absinthe/phase/document/validation/unique_operation_names.ex
defmodule Absinthe.Phase.Document.Validation.UniqueOperationNames do
@moduledoc false
# Validates document to ensure that all operations 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
operations = for operation <- input.operations do
process(operation, input.operations)
end
result = %{input | operations: operations}
{:ok, result}
end
@spec process(Blueprint.Document.Operation.t, [Blueprint.Document.Operation.t]) :: boolean
defp process(%{name: nil} = operation, _) do
operation
end
defp process(operation, operations) do
if duplicate?(operations, operation) do
operation
|> flag_invalid(:duplicate_name)
|> put_error(error(operation))
else
operation
end
end
# Whether a duplicate operation is present
@spec duplicate?([Blueprint.Document.Operation.t], Blueprint.Document.Operation.t) :: boolean
defp duplicate?(operations, operation) do
Enum.count(operations, &(&1.name == operation.name)) > 1
end
# Generate an error for a duplicate operation.
@spec error(Blueprint.Document.Operation.t) :: Phase.Error.t
defp error(node) do
Phase.Error.new(
__MODULE__,
error_message(node.name),
location: node.source_location
)
end
@doc """
Generate an error message for a duplicate operation.
"""
@spec error_message(String.t) :: String.t
def error_message(name) do
~s(There can only be one operation named "#{name}".)
end
end