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Conditionally eager load relationships in graphql

You can conditionlly eagerload relationships in graphql-ruby by looking at look aheads:

module Resolvers
  class Customer < Resolvers::BaseResolver
    extras [:lookahead]
    argument :id, ID, required: true

    def resolve(lookahead:, id:)
      scope = ::Customer

      if lookahead.selects?(:orders)
        scope = scope.includes(:orders)

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