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lib/absinthe/phase/schema/validation/one_of_directive.ex
defmodule Absinthe.Phase.Schema.Validation.OneOfDirective do
@moduledoc false
# Schema validation phase that ensures that uses of the `@oneOf` directive comply with the spec
use Absinthe.Phase
alias Absinthe.Blueprint
alias Absinthe.Blueprint.Schema.InputObjectTypeDefinition
alias Absinthe.Blueprint.TypeReference.NonNull
def run(blueprint, _options \\ []) do
{:ok, Blueprint.prewalk(blueprint, &process/1)}
end
defp process(%InputObjectTypeDefinition{directives: [_ | _] = directives} = node) do
one_of? = Enum.any?(directives, &(&1.name == "one_of"))
cond do
one_of? and length(node.fields) == 1 ->
add_error(node, """
The oneOf directive is only valid on input types with more then one field.
The input type "#{node.name}" only defines one field.
""")
one_of? and Enum.any?(node.fields, &match?(%NonNull{}, &1.type)) ->
add_error(node, """
The oneOf directive is only valid on input types with all nullable fields.
The input type "#{node.name}" has one or more nullable fields.
""")
true ->
node
end
end
defp process(node), do: node
defp add_error(node, message) do
error = %Absinthe.Phase.Error{
locations: [node.__reference__.location],
message: message,
phase: __MODULE__
}
put_error(node, error)
end
end