Razan week3#46
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| Add a new POST endpoint /customers to create a new customer. | ||
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| - Add a new POST endpoint `/products` to create a new product. | ||
| Add a new POST endpoint /products to create a new product (with a product name, a price and a supplier id). Check that the price is a positive integer and that the supplier ID exists in the database, otherwise return an error. |
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Why did you change the task description?
zoltan-gal
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zoltan-gal
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There were a few mistakes but overall was great! Very nice job Razan! Solid demonstration of SQL queries. I really liked that you used the promise variation of the query method call instead of the callback version.
Some advice:
- please don't forget to keep a consistent indentation and code format. It was difficult to disentangle at some places which code blocks were embedded into another block and which wasn't.
- Try use more consistent messaging, put more information into the response messages like object ID affected, or details that have changed, or the reason of failure. It will help to detect issues when debugging.
| app.get("/customers/:customerId", function (req, res) { | ||
| const custId =Number(req.params.customerId); | ||
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| if(custId<0){ |
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I don't think we need to check if id is smaller than zero. We have no such constraint. Technically a negative id is still valid.
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| pool | ||
| .query("SELECT * FROM customers WHERE id=$1", [custId]) | ||
| .then((result) => res.json(result.rows)) |
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Negative scenario should be handled. what if a customer with given id doesn't exist.
| const newCountry = req.body.country; | ||
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| pool | ||
| .query("SELECT * FROM customers WHERE name=$1", [newName]) |
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Why is it a problem if a user with the same name registered? It wasn't a criterion. The same name can occur multiple time.
| const query = | ||
| "INSERT INTO customers (name, address, city, country) VALUES ($1, $2, $3, $4)"; | ||
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| pool | ||
| .query(query, [newName, newAddress, newCity,newCountry ]) | ||
| .then(() => res.send("Customer created!")) | ||
| .catch((e) => console.error(e)); |
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Well done. It's also worth including the ID for the newly created customer into the response. So that client will know what ID it got
| //////// Add a new POST endpoint /products to create a new product (with a product name, a price and a supplier id). Check that the price is a positive integer and that the supplier ID exists in the database, otherwise return an error./////// | ||
| app.post("/products", function (req, res) { |
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I think you mixed together two different tasks. Originally it was as follows:
Add a new POST endpoint /products to create a new product.
Add a new POST endpoint /availability to create a new product availability (with a price and a supplier id). Check that the price is a positive integer and that both the product and supplier ID's exist in the database, otherwise return an error.
| if (result.rows.length < 0) { | ||
| return res | ||
| .status(400) | ||
| .send("An customers doesn't exists!"); |
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The customer doesn't exist! also it's a good practice to include the ID into the message e.g The customer '$custId' doesn't exist
| pool | ||
| .query("UPDATE customers SET name=$2 , address =$3, city= $4, country= $5 WHERE id=$1 ", [ custId,newName, newAddress, newCity, newCountry]) | ||
| .then((result) => res.json(result.rows)) | ||
| .catch((e) => console.error(e)); |
| pool | ||
| .query("DELETE FROM order_items WHERE order_id =$1", [orderId]) | ||
| .then(() => { | ||
| pool | ||
| .query("DELETE FROM orders WHERE id=$1", [orderId]) | ||
| .then(() => res.send(`Customer ${orderId} deleted!`)) | ||
| .catch((e) => console.error(e)); | ||
| }) | ||
| .catch((e) => console.error(e)); |
| pool | ||
| .query("SELECT * FROM orders WHERE customer_id =$1", [customerId]) | ||
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| .then((result) => { | ||
| if (result.rows.length > 0) { | ||
| return res | ||
| .status(400) | ||
| .send("This customer has order!"); | ||
| } else { | ||
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| pool | ||
| .query("DELETE FROM customers WHERE id =$1", [customerId]) | ||
| .then(() => res.send(`Customer ${customerId} deleted!`)) | ||
| .catch((e) => console.error(e)); | ||
| } | ||
| }); |
| .query("SELECT orders.order_reference, orders.order_date, products.product_name, products.unit_price, suppliers.supplier_name , order_items.quantity FROM orders INNER JOIN order_items ON order_items.order_id = orders.id INNER JOIN products ON order_items.product_id = products.id INNER JOIN suppliers ON products.supplier_id = suppliers.id where customer_id=$1", [custId]) | ||
| .then((result) => res.json(result.rows)) | ||
| .catch((e) => console.error(e)); |
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Nearly correct. But unit_price should come from product_availability table, products table has no such column.
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