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lib/absinthe/phase/document/validation/provided_non_null_variables.ex
defmodule Absinthe.Phase.Document.Validation.ProvidedNonNullVariables do
@moduledoc false
# Validates document to ensure that all non-null variable definitions
# are provided values.
alias Absinthe.{Blueprint, Phase, Schema}
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, input.schema))
{:ok, result}
end
# Find variable definitions
@spec handle_node(Blueprint.node_t, Schema.t) :: Blueprint.node_t
defp handle_node(%Blueprint.Document.VariableDefinition{type: %Blueprint.TypeReference.NonNull{}, provided_value: nil} = node, _) do
node
|> put_error(error(node))
end
defp handle_node(%Blueprint.Document.VariableDefinition{type: %Blueprint.TypeReference.NonNull{}, provided_value: %Blueprint.Input.Null{}} = node, _) do
node
|> put_error(error(node))
end
defp handle_node(node, _) do
node
end
# Generate an error for 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 the error message.
"""
@spec error_message(String.t) :: String.t
def error_message(variable_name) do
~s(Variable "#{variable_name}": Expected non-null, found null.)
end
end