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GraphQL for Elixir
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lib/absinthe/schema/rule/object_interfaces_must_be_valid.ex
defmodule Absinthe.Schema.Rule.ObjectInterfacesMustBeValid do
use Absinthe.Schema.Rule
alias Absinthe.Schema
alias Absinthe.Type
@moduledoc false
@description """
Only interfaces may be present in an Object's interface list.
Reference: https://github.com/facebook/graphql/blob/master/spec/Section%203%20--%20Type%20System.md#interfaces
"""
def explanation(%{data: %{object: obj, interface: interface}}) do
"""
Type "#{obj}" cannot implement non-interface type "#{interface}"
#{@description}
"""
end
def check(schema) do
Schema.types(schema)
|> Enum.flat_map(&check_type(schema, &1))
end
defp check_type(schema, %{interfaces: ifaces} = type) do
ifaces
|> Enum.map(&Schema.lookup_type(schema, &1))
|> Enum.reduce([], fn
nil, _ ->
raise "No type found in #{inspect ifaces}"
%Type.Interface{}, acc ->
acc
iface_type, acc ->
[report(type.__reference__.location, %{object: type.name, interface: iface_type.name}) | acc]
end)
end
defp check_type(_, _) do
[]
end
end