How to use JSON column type?

Hi. I'm new to Drizzle and 'm strugling with JSON column type. Here is the example:

interface Translation {
  __: string
  hr?: string
  cs?: string
  de?: string
  en?: string
}

// table schema
export const nodes = mysqlTable('nodes', {
  // ...
  name: json('value').$type<Translation>().notNull(),
  // ...
}

// inserting JSON
await db.insert(models.nodes)
  .values({
    //...
    // node.name = {
    //   "__": "Moda",
    //   "hr": "Moda",
    //   "cs": "Móda",
    //   "en": "Fashion",
    //   "de": "Mode"
    // }
    name: node.name
    //...
  })

interface Translation {
  __: string
  hr?: string
  cs?: string
  de?: string
  en?: string
}

// table schema
export const nodes = mysqlTable('nodes', {
  // ...
  name: json('value').$type<Translation>().notNull(),
  // ...
}

// inserting JSON
await db.insert(models.nodes)
  .values({
    //...
    // node.name = {
    //   "__": "Moda",
    //   "hr": "Moda",
    //   "cs": "Móda",
    //   "en": "Fashion",
    //   "de": "Mode"
    // }
    name: node.name
    //...
  })

So far everything looks good. But I'm confused when selecting the JSON column name;

// selecting JSON
const nodes = await db.select().from(models.nodes)

// this is valid typescript code but is always undefined.
console.log(nodes[0].name.en)

// this is not valid typescript code, but works.
console.log(JSON.parse(nodes[0].name).en)

// selecting JSON
const nodes = await db.select().from(models.nodes)

// this is valid typescript code but is always undefined.
console.log(nodes[0].name.en)

// this is not valid typescript code, but works.
console.log(JSON.parse(nodes[0].name).en)

So the problem is that I get nice typescript support when selecting JSON column, because type is passed to json().$type<>, but selected "name" is just a string which need to be parsed. What am I missing?

1 Reply

JureOP•9mo ago

Should Drizzle parse the string stored as JSON or why do I get type support here?

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How to use JSON column type?