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