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N+1 Proof Serialization with preloaded associations

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                  class Api::CollectionsController < ActionController::API
  def show
    collection = Collection.includes(snips: [:author, :code_blocks]).find(params[:id])
    render json: CollectionSerializer.new(collection).as_json
  end
end

                  class CollectionSerializer
  def initialize(collection)
    @collection = collection
  end

  def as_json
    {
      id: @collection.id,
      title: @collection.title,
      snips: @collection.snips.map do |s|
        {
          id: s.id,
          title: s.title,
          author: { id: s.author.id, nickname: s.author.nickname },
          code_blocks: s.code_blocks.map { |cb| { name: cb.name, lang: cb.hljs_language } }
        }
      end
    }
  end
end

When rendering JSON, the serializer layer can silently trigger extra queries. Force “preload then serialize” so your JSON rendering path is deterministic. This pattern scales well in Rails APIs.

Sarah Chen

More from Sarah Chen

N+1 Proof Serialization with preloaded associations

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More from Sarah Chen