Class: GraphQL::Language::Printer

Inherits:

Object

• Object
• GraphQL::Language::Printer

Defined in:

lib/graphql/language/printer.rb

Direct Known Subclasses

Schema::Printer, Schema::Printer::IntrospectionPrinter

Instance Method Summary

• #print(node, indent: "") ⇒ String

  Turn an arbitrary AST node back into a string.

Instance Method Details

#print(node, indent: "") ⇒ String

Turn an arbitrary AST node back into a string.

Examples:

Turning a document into a query string

document = GraphQL.parse(query_string)
GraphQL::Language::Printer.new.print(document)
# => "{ ... }"

Building a custom printer

class MyPrinter < GraphQL::Language::Printer
  def print_argument(arg)
    "#{arg.name}: <HIDDEN>"
  end
end

MyPrinter.new.print(document)
# => "mutation { pay(creditCard: <HIDDEN>) { success } }"

Parameters:

• indent (String) —

  Whitespace to add to the printed node

Returns:

• (String) —

  Valid GraphQL for node

# File 'lib/graphql/language/printer.rb', line 27

def print(node, indent: "")
  print_node(node, indent: indent)
end