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BETTERZON-38: Adjusted prices API

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This commit is contained in:
Patrick Müller 2020-12-09 17:26:56 +01:00
parent acdc9a4e92
commit 6338060b78
2 changed files with 94 additions and 21 deletions
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35
Backend/src/models/prices/prices.router.ts
View File

@ -23,7 +23,20 @@ export const pricesRouter = express.Router();
pricesRouter.get('/', async (req: Request, res: Response) => {
try {
const prices: Prices = await PriceService.findAll();
let prices: Prices = [];
const product = req.query.product;
const vendor = req.query.vendor;
const type = req.query.type;
if (product) {
if (vendor) {
prices = await PriceService.findByVendor(<string> product, <string> vendor, <string> type);
} else {
prices = await PriceService.findByType(<string> product, <string> type);
}
} else {
prices = await PriceService.findAll();
}
res.status(200).send(prices);
} catch (e) {
@ -50,26 +63,6 @@ pricesRouter.get('/:id', async (req: Request, res: Response) => {
}
});
// GET items/:name
pricesRouter.get('/products/:id', async (req: Request, res: Response) => {
const id: number = parseInt(req.params.id, 10);
if (!id) {
res.status(400).send('Missing parameters.');
return;
}
try {
const prices: Prices = await PriceService.findByProduct(id);
res.status(200).send(prices);
} catch (e) {
res.status(404).send(e.message);
}
});
// POST items/
// pricesRouter.post('/', async (req: Request, res: Response) => {

80
Backend/src/models/prices/prices.service.ts
View File

@ -106,6 +106,86 @@ export const findByProduct = async (product: number): Promise<Prices> => {
return priceRows;
};
export const findByType = async (product: string, type: string): Promise<Prices> => {
let conn;
let priceRows = [];
try {
conn = await pool.getConnection();
let rows = [];
if (type === 'newest') {
// Used to get the newest price for this product per vendor
rows = await conn.query(('WITH summary AS ( ' +
'SELECT p.product_id, ' +
'p.vendor_id, ' +
'p.price_in_cents, ' +
'p.timestamp, ' +
'ROW_NUMBER() OVER( ' +
'PARTITION BY p.vendor_id ' +
'ORDER BY p.timestamp DESC) AS rk ' +
'FROM prices p ' +
'WHERE product_id = ?) ' +
'SELECT s.* ' +
'FROM summary s ' +
'WHERE s.rk = 1 '), product);
} else if (type === 'lowest') {
// Used to get the lowest prices for this product over a period of time
rows = await conn.query('SELECT price_id, product_id, vendor_id, MIN(price_in_cents) as price_in_cents, timestamp FROM prices WHERE product_id = ? GROUP BY DAY(timestamp) ORDER BY timestamp', product);
} else {
// If no type is given, return all prices for this product
rows = await conn.query('SELECT price_id, product_id, vendor_id, price_in_cents, timestamp FROM prices WHERE product_id = ?', product);
}
for (let row in rows) {
if (row !== 'meta') {
priceRows.push(rows[row]);
}
}
} catch (err) {
throw err;
} finally {
if (conn) {
conn.end();
}
}
return priceRows;
};
export const findByVendor = async (product: string, vendor: string, type: string): Promise<Prices> => {
let conn;
let priceRows = [];
try {
conn = await pool.getConnection();
let rows = [];
if (type === 'newest') {
// Used to get the newest price for this product and vendor
rows = await conn.query('SELECT price_id, product_id, vendor_id, price_in_cents, timestamp FROM prices WHERE product_id = ? AND vendor_id = ? ORDER BY timestamp DESC LIMIT 1', [product, vendor]);
} else if (type === 'lowest') {
// Used to get the lowest prices for this product and vendor in all time
rows = await conn.query('SELECT price_id, product_id, vendor_id, MIN(price_in_cents) as price_in_cents, timestamp FROM prices WHERE product_id = ? AND vendor_id = ? LIMIT 1', [product, vendor]);
} else {
// If no type is given, return all prices for this product and vendor
rows = await conn.query('SELECT price_id, product_id, vendor_id, price_in_cents, timestamp FROM prices WHERE product_id = ? AND vendor_id = ?', [product, vendor]);
}
for (let row in rows) {
if (row !== 'meta') {
priceRows.push(rows[row]);
}
}
} catch (err) {
throw err;
} finally {
if (conn) {
conn.end();
}
}
return priceRows;
};
// export const create = async (newItem: Product): Promise<void> => {
// let conn;
// try {