Class: InstantRecord::RecordsController

Inherits:
ActionController::API
  • Object
show all
Defined in:
app/controllers/instant_record/records_controller.rb

Overview

Keyset-cursor history pages for windowed models: rows strictly below the (created_at, id) tuple, newest first. Backs InstantRecord.fetch_history; never uses OFFSET, so page cost stays flat at any depth.

Constant Summary collapse

HARD_LIMIT =

Independent of any model's window size: the ceiling a client can request in one page.

200

Instance Method Summary collapse

Instance Method Details

#index ⇒ Object 



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# File 'app/controllers/instant_record/records_controller.rb', line 12

def index
  model = InstantRecord.synced_model(params[:type])
  return head :not_found unless model

  window = model.instant_record_sync_window
  return head :unprocessable_entity unless window
  return head :bad_request if window.partition_by && params[:partition].blank?

  before_at = parse_time(params[:before_created_at])
  return head :bad_request if before_at.nil? || params[:before_id].blank?

  limit = (params[:limit].presence || window.limit).to_i.clamp(1, HARD_LIMIT)
  rows = window
    .keyset_below(at: before_at, id: params[:before_id], partition: params[:partition])
    .limit(limit + 1)
    .to_a

  render json: {
    records: rows.first(limit).map { |record| InstantRecord.record_payload(record) },
    has_more: rows.size > limit
  }
end