Utilizing NextJs req.query parameter in Prisma for advanced query filtering

Currently, I am delving into the world of NextJS and experimenting with sending requests to an API while passing a parameter that is then used by Prisma to query the database.

In order to achieve this, I've created a new file located at /api/posts/[slug].ts and initiated a request like so: /api/posts/this-is-my-slug.

To extract the slug parameter from the URL, I utilize the following code snippet:

const { slug } = req.query;

Subsequently, my intention is to pass the extracted slug value to the 'where' clause in the Prisma query as shown below:

const article = await prismaClient.posts.findFirst({
    where: {
        slug: slug
    }
})

However, upon implementation, I encounter the subsequent error message:

TS2322: Type 'string | string[]' is not assignable to type 'string | StringFilter'.   Type 'string[]' is not assignable to type 'string | StringFilter'.

Provided below is the schema model for the posts table within my Prisma setup:

model posts {
    id          Int         @id @default(autoincrement())
    createdAt   DateTime    @default(now())
    title       String      @db.VarChar(255)
    content     String      @db.MediumText
    slug        String      @db.VarChar(255)
    published   Boolean     @default(false)
    author      users       @relation(fields: [authorId], references: [userId])
    authorId    Int
}

The root cause of this error eludes me at the moment. Interestingly, no errors are displayed in the IDE when I hardcode the slug string, yet utilizing the variable from req.query seems to trigger some discontent.

Answer №1

context.query (also known as req.query) actually represents the query string, which includes dynamic route parameters, hence why it is typed as string | string[] to allow for multiple entries with the same name.

If you were utilizing getServerSideProps, you could access context.params.slug by properly typing the function like this:

type Params = { slug: string };

export const getServerSideProps: GetServerSideProps<Props, Params> = () => {/* ... */}

However, in a Next.js API route, this approach is not feasible, so you must work with query and convert string | string[] into an array and then retrieve the first element.

When working with Prisma, it typically expects a single string input, unless other operators are used. For example, you can use the in operator to search for records between multiple slugs:

prisma.posts.findFirst({
  where: {
    slug: {
      // Here you would pass an array instead of a single string
      in: ['abc', 'fgh']
    }
  }
})

For more information on filters and operators in Prisma, you can refer to this resource.

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