Simple field authorization Ruby GraphQL

garfield_policy.rb

# Add the GarfieldPolicy to GraphQL directory
class GarfieldPolicy
  attr_accessor :field
  attr_accessor :options
  
  def initialize(field:, options:)
    @field = field
    @options = options || {}
    apply
    freeze
  end
  
  def apply
  end
  
  def after_resolve(object:, arguments:, context:, value:, memo:)
    value
  end

  
  
  def resolve(object:, arguments:, context:)
    authorized = options[:authorize].call(object, arguments, context)
    if  authorized
      yield(object, arguments, nil)
    else
      raise GraphQL::ExecutionError, "Not authorized to access: #{@field.name}"
    end
  end
end


# Field usage: 
module Types
  class UserType < Types::BaseObject
    field :id, ID, null: false, extensions: garfield(->(obj, args, ctx) { ctx[:current_user].admin? })
  end
end