frontend/src/utils/adminPaginatedList.js - dev - kreyndelHam/Konstructorium

frontend/src/utils/adminPaginatedList.js
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MihahamYT
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25 май 2026, 14:46
25 май 2026, 14:46c95f449
/**
 * Utilities for loading full DRF-paginated admin lists (PAGE_SIZE=50).
 */

/**
 * Extract list items from a DRF page or plain array payload.
 *
 * @param {unknown} payload - Response body (`data` from axios).
 * @returns {unknown[]}
 */
export function extractAdminListPage(payload) {
  if (Array.isArray(payload)) {
    return payload
  }
  if (payload && typeof payload === 'object' && Array.isArray(payload.results)) {
    return payload.results
  }
  return []
}

/**
 * Resolve admin API path from DRF `next` URL (absolute or relative).
 *
 * @param {string|null|undefined} nextUrl - DRF pagination `next` link.
 * @returns {string|null} Path relative to admin API base (e.g. `/notifications/?page=2`).
 */
export function adminListPathFromNextUrl(nextUrl) {
  if (!nextUrl || typeof nextUrl !== 'string') {
    return null
  }
  try {
    const parsed = new URL(nextUrl, window.location.origin)
    const marker = '/api/admin'
    const markerIndex = parsed.pathname.indexOf(marker)
    if (markerIndex >= 0) {
      return `${parsed.pathname.slice(markerIndex + marker.length)}${parsed.search}`
    }
    if (nextUrl.startsWith('/')) {
      return nextUrl
    }
  } catch {
    if (nextUrl.startsWith('/')) {
      return nextUrl
    }
  }
  return null
}

/**
 * Fetch every page of a paginated admin list.
 *
 * @param {(params?: Record<string, unknown>) => Promise<{ data: unknown }>} fetchFirstPage - Loads page 1 with query params.
 * @param {Record<string, unknown>} [params] - Query params for the first request.
 * @param {(path: string) => Promise<{ data: unknown }>} fetchByPath - Follow-up GET for `next` URLs (path under `/api/admin`).
 * @returns {Promise<unknown[]>} Concatenated `results` from all pages.
 */
export async function fetchAllAdminListPages(fetchFirstPage, params = {}, fetchByPath) {
  let response = await fetchFirstPage(params)
  let items = [...extractAdminListPage(response.data)]
  let nextUrl = response.data && typeof response.data === 'object' ? response.data.next : null

  while (nextUrl) {
    const path = adminListPathFromNextUrl(nextUrl)
    if (!path) {
      break
    }
    response = await fetchByPath(path)
    items = items.concat(extractAdminListPage(response.data))
    nextUrl = response.data && typeof response.data === 'object' ? response.data.next : null
  }

  return items
}