Yaya sarrafa kurakurai ke aiki a cikin GraphQL?

Question

IT Interview Practice · Accepted Answer

GraphQL kullum yana mayar da HTTP **200** don wata hanyar sufuri mai nasara; ana ba da rahoton matsaloli a cikin jikin amsar, ba a code ɗin matsayin ba. Amsar tana da maɓallai biyu na top-level: **`data`** da **`errors`**, kuma duka biyu na iya kasancewa a lokaci guda — wannan shi ne **partial data**.

## Partial data + jerin errors

In resolver na fili guda ya jefa kuskure, wannan filin ya zama `null`, an ƙara wani shiga cikin `errors`, amma kowane fili yana warwarewa. Abokin ciniki yana samun abin da ya yi nasara tare da bayanin abin da ya gaza.

```json
{
  "data": { "user": { "name": "Ada", "posts": null } },
  "errors": [
    {
      "message": "Failed to load posts",
      "path": ["user", "posts"],        // exactly which field failed
      "extensions": { "code": "DOWNSTREAM_TIMEOUT" }
    }
  ]
}
```

Filin **`extensions.code`** yana ɗauke da code ɗin kuskure da inji zai iya karantawa domin abokan ciniki su iya rassa (branch) bisansa. Ko fili da aka jefa ya sa kansa kawai null ko ya haura sama ya dogara da **nullability**: fili na non-null (`posts: [Post!]!`) da ya sami kuskure yana sa parent ɗinsa mafi kusa mai nullable ya zama null maimakon.

```js
import { GraphQLError } from "graphql";

Ƙungiyoyi da yawa suna kuma yin ƙirar kurakurai **da ake tsammani** (validation, "email taken") a matsayin ɓangare na schema ta hanyar union/result types, suna ajiye jerin `errors` don gazawar **da ba a tsammani ba** — suna kiyaye nau'in happy-path mai tsafta.

## Me ya sa yake da muhimmanci

Masu tambayoyin hira suna bincike ko ka san cewa kurakurai suna zaune a cikin jikin tare da partial `data`, cewa codes suna cikin `extensions`, kuma cewa nullability yana sarrafa yadda nisa wani kuskure yake haurawa. Rikita kurakuran GraphQL da code ɗin matsayin HTTP alama ce ta gargajiya cewa wani ya yi amfani da REST kawai.

Partial data + jerin errors

Me ya sa yake da muhimmanci

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