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Building a Data Pipeline for Vehicle Listings: The Parts That Get Complicated

A vehicle listing looks simple from the front end. You might have a make, model, year, mileage, price and a few images. But behind that interface, keeping the data accurate can become a surprisingly…

• Source data inconsistency requires normalization layer
• Vehicle Identification Number (VIN) as unique identifier
• Timestamped pricing with currency and conversion details

44m ago ·dev.to

Reclaiming Attention: Building a Distraction-Free Android Launcher

As developers, we spend our days optimizing systems, but how often do we optimize our own focus? After realizing how much time I was losing to a cluttered, notification-heavy home screen, I decided to…

• Text-only interface replaces app icons with text-based list
• Pure black OLED screen saves battery, creates minimalist look
• Built-in tasks and app locks create productivity hub, distraction barrier

46m ago ·dev.to

An alternate-key lookup still needs object authorization

Most BOLA writeups show GET /orders/{id} with a guessed UUID. The same bug often hides behind a “friendlier” lookup: GET /orders?email= , findByExternalId , or where slug = ? .

• Alternate-key lookups can expose object authorization flaws.
• System should authorize loaded resource for specific subject.
• Same denial shape as id-based routes prevents accidental oracles.

43m ago ·dev.to

协程到底是什么？用"一个人守三口锅"讲明白，别再和线程混为一谈

面试里被问"协程是什么"，很多人的答案是一句背来的话："协程是用户态的轻量级线程。" 这句话不算错，但它几乎解释不了任何事。听完之后你还是不知道该在什么时候用它、为什么它会被一个 time.sleep() 卡死、为什么它不需要锁。 这篇不讲定义，只讲三件事： 协程在切什么、调度权在谁手里、什么时候不该用。 一、先把三个词排成一队：进程、线程、协程…

42m ago ·dev.to

协程到底是什么？把它当成“一个能中途暂停的函数”，一切就通了

TL;DR：协程不是“更快的线程”，它是一个可以在中途停下来、把线程让给别人、之后还能从停下的那一行接着跑的函数。它省掉的不是计算时间，而是等 IO 时的空转。 面试被问“协程是什么”，大多数人的答案是背来的一句：“协程是用户态的轻量级线程。” 这句话不算错，但它几乎解释不了任何事。听完你还是不知道该在什么时候用它、为什么它会被一个 time.sleep() 卡死、为什么它不需要锁。…

42m ago ·dev.to