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lib/absinthe/introspection/field.ex
defmodule Absinthe.Introspection.Field do
@moduledoc false
use Absinthe.Schema.Notation
alias Absinthe.Schema
alias Absinthe.Type
def meta("typename") do
%Type.Field{
name: "__typename",
type: :string,
description: "The name of the object type currently being queried.",
middleware: [
Absinthe.Resolution.resolver_spec(fn
_, %{parent_type: %Type.Object{} = type} ->
{:ok, type.name}
_, %{source: source, parent_type: %Type.Interface{} = iface} = env ->
case Type.Interface.resolve_type(iface, source, env) do
nil ->
{:error, "Could not resolve type of concrete " <> iface.name}
type ->
{:ok, type.name}
end
_, %{source: source, parent_type: %Type.Union{} = union} = env ->
case Type.Union.resolve_type(union, source, env) do
nil ->
{:error, "Could not resolve type of concrete " <> union.name}
type ->
{:ok, type.name}
end
end)
]
}
end
def meta("type") do
%Type.Field{
name: "__type",
type: :__type,
description: "Represents scalars, interfaces, object types, unions, enums in the system",
args: %{
name: %Type.Argument{
identifier: :name,
name: "name",
type: %Absinthe.Type.NonNull{of_type: :string},
description: "The name of the type to introspect"
}
},
middleware: [
Absinthe.Resolution.resolver_spec(fn %{name: name}, %{schema: schema} ->
{:ok, Schema.lookup_type(schema, name)}
end)
]
}
end
def meta("schema") do
%Type.Field{
name: "__schema",
type: :__schema,
description: "Represents the schema",
middleware: [
Absinthe.Resolution.resolver_spec(fn _, %{schema: schema} ->
{:ok, schema}
end)
]
}
end
def meta(_), do: nil
end