Class: GraphQL::Stitching::Util

Inherits:
Object
  • Object
show all
Defined in:
lib/graphql/stitching/util.rb

Overview

General utilities to aid with stitching.

Defined Under Namespace

Classes: TypeStructure

Class Method Summary collapse

Class Method Details

.expand_abstract_type(schema, parent_type) ⇒ Object

expands interfaces and unions to an array of their memberships like schema.possible_types, but includes child interfaces



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# File 'lib/graphql/stitching/util.rb', line 81

def expand_abstract_type(schema, parent_type)
  return [] unless parent_type.kind.abstract?
  return parent_type.possible_types if parent_type.kind.union?

  result = []
  schema.types.each_value do |type|
    next unless type <= GraphQL::Schema::Interface && type != parent_type
    next unless type.interfaces.include?(parent_type)
    result << type
    result.push(*expand_abstract_type(schema, type)) if type.kind.interface?
  end
  result.tap(&:uniq!)
end

.flatten_ast_type_structure(ast, structure: []) ⇒ Object

builds a single-dimensional representation of a wrapped type structure from AST



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# File 'lib/graphql/stitching/util.rb', line 52

def flatten_ast_type_structure(ast, structure: [])
  null = true

  while ast.is_a?(GraphQL::Language::Nodes::NonNullType)
    ast = ast.of_type
    null = false
  end

  if ast.is_a?(GraphQL::Language::Nodes::ListType)
    structure << TypeStructure.new(
      list: true,
      null: null,
      name: nil,
    )

    flatten_ast_type_structure(ast.of_type, structure: structure)
  else
    structure << TypeStructure.new(
      list: false,
      null: null,
      name: ast.name,
    )
  end

  structure
end

.flatten_type_structure(type) ⇒ Object

builds a single-dimensional representation of a wrapped type structure



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# File 'lib/graphql/stitching/util.rb', line 29

def flatten_type_structure(type)
  structure = []

  while type.list?
    structure << TypeStructure.new(
      list: true,
      null: !type.non_null?,
      name: nil,
    )

    type = unwrap_non_null(type).of_type
  end

  structure << TypeStructure.new(
    list: false,
    null: !type.non_null?,
    name: type.unwrap.graphql_name,
  )

  structure
end

.is_leaf_type?(type) ⇒ Boolean

specifies if a type is a primitive leaf value

Returns:

  • (Boolean) 


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# File 'lib/graphql/stitching/util.rb', line 18

def is_leaf_type?(type)
  type.kind.scalar? || type.kind.enum?
end

.unwrap_non_null(type) ⇒ Object

strips non-null wrappers from a type



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# File 'lib/graphql/stitching/util.rb', line 23

def unwrap_non_null(type)
  type = type.of_type while type.non_null?
  type
end