30 lines
810 B
JavaScript
30 lines
810 B
JavaScript
const DataLoader = require("dataloader");
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async function loadItems(db, ids) {
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const qs = ids.map((_) => "?").join(",");
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const [rows, _] = await db.execute(
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`SELECT * FROM items WHERE id IN (${qs})`,
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ids
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);
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return rows;
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}
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const buildItemTranslationLoader = (db) =>
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new DataLoader(async (itemIds) => {
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const qs = itemIds.map((_) => "?").join(",");
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const [rows, _] = await db.execute(
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`SELECT * FROM item_translations WHERE item_id IN (${qs}) AND locale = "en"`,
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itemIds
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);
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const rowsByItemId = new Map(rows.map((row) => [row.item_id, row]));
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return itemIds.map(
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(itemId) =>
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rowsByItemId.get(itemId) ||
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new Error(`could not find translation for item ${itemId}`)
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);
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});
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module.exports = { loadItems, buildItemTranslationLoader };
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