Incorrect Information on MySQL Full-Text Search with Minus Operator

[leemhoon00]

I'm writing to report an inconsistency in the documentation regarding MySQL full-text search with the minus operator (-).

Incorrect Information

Page: https://www.prisma.io/docs/orm/prisma-client/queries/full-text-search#mysql

The statement that "The minus operator (-) excludes rows that contain a specific word" is not accurate.
According to MySQL's official documentation (https://dev.mysql.com/doc/refman/8.0/en/fulltext-boolean.html), the minus operator cannot be used by itself. It must be combined with other keywords or operators to form valid full-text search queries.

Testing and Results

Schema

generator client {
  provider = "prisma-client-js"
  previewFeatures = ["fullTextSearch", "fullTextIndex"]
}

datasource db {
  provider = "mysql"
  url      = "mysql://root:root@localhost:3306/temp"
}

model Post {
  id Int @id @default(autoincrement())
  content String

  @@fulltext([content])
}

Query Code

async function main() {
  const result1 = await prisma.post.findMany({
    where: {
      content: {
        search: '+dog -cat',
      },
    },
  });

  const result2 = await prisma.post.findMany({
    where: {
      content: {
        search: '-cat',
      },
    },
  });

  const result3 = await prisma.post.findMany({
    where: {
      content: {
        search: '-cat -pig',
      },
    },
  });

  console.log(result1);
  console.log(result2);
  console.log(result3);
}

Output

[ { id: 1, content: 'The quick brown fox jumps over the lazy dog' } ]
[]
[]

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