Alessandro Magionami
45 lines
1.0 KiB
TypeScript
45 lines
1.0 KiB
TypeScript
import {
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decodeIsoDateCursor,
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encodeIsoDateCursor
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} from '@/modules/shared/helpers/graphqlHelper'
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type Collection<T> = {
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cursor: string | null
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totalCount: number
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items: T[]
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}
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type GetPaginatedItemsArgs = {
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limit: number
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cursor?: string
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}
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export const getPaginatedItemsFactory =
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<TArgs extends GetPaginatedItemsArgs, T extends { createdAt: Date }>({
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getItems,
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getTotalCount
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}: {
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getItems: (args: TArgs) => Promise<T[]>
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getTotalCount: (args: Omit<TArgs, 'cursor' | 'limit'>) => Promise<number>
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}) =>
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async (args: TArgs): Promise<Collection<T>> => {
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const maybeDecodedCursor = args.cursor ? decodeIsoDateCursor(args.cursor) : null
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const items = await getItems({
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...args,
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cursor: maybeDecodedCursor ?? undefined
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})
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const totalCount = await getTotalCount(args)
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let cursor = null
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if (items.length === args.limit) {
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const lastItem = items.at(-1)
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cursor = lastItem ? encodeIsoDateCursor(lastItem.createdAt) : null
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}
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return {
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items,
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cursor,
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totalCount
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}
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}
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