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lib/absinthe/phase/document/validation/only_one_subscription.ex
defmodule Absinthe.Phase.Document.Validation.OnlyOneSubscription do
@moduledoc false
# Validates document to ensure that the only variables that are used in a
# document are defined on the operation.
alias Absinthe.{Blueprint, Phase}
use Absinthe.Phase
@doc """
Run the validation.
"""
@spec run(Blueprint.t(), Keyword.t()) :: Phase.result_t()
def run(input, _options \\ []) do
bp =
Blueprint.update_current(input, fn
%{type: :subscription} = op ->
check_op(op)
op ->
op
end)
{:ok, bp}
end
defp check_op(%{selections: [_, _ | _]} = op) do
error = %Phase.Error{
phase: __MODULE__,
message: "Only one field is permitted on the root object when subscribing",
locations: [op.source_location]
}
op
|> flag_invalid(:too_many_fields)
|> put_error(error)
end
defp check_op(op), do: op
end