Prisma•2mo ago

How to use connect with relations in Prisma (normal case explained)

I can't understand why some time connect work and some time not. I can't understand how and when it work? Please help me. In user connect work properly but in institute the connect not work for address.

3 Replies

Prisma AI Help•2mo ago

You selected the bot's instantaneous insights. Let me compile your answer right away! The connect feature in Prisma is used to link a record to an existing related record by specifying a unique identifier (like id or another unique field). It works in both create and update operations. Here’s how it works in the "normal" case: Example:

const user = await prisma.profile.create({
  data: {
    bio: 'Hello World',
    user: {
      connect: { id: 42 }, // Connects to existing User with id 42
    },
  },
});

const user = await prisma.profile.create({
  data: {
    bio: 'Hello World',
    user: {
      connect: { id: 42 }, // Connects to existing User with id 42
    },
  },
});

Or, for a many-to-many relation:

const user = await prisma.user.update({
  where: { email: 'alice@prisma.io' },
  data: {
    posts: {
      connect: [{ id: 24 }, { id: 42 }],
    },
  },
});

const user = await prisma.user.update({
  where: { email: 'alice@prisma.io' },
  data: {
    posts: {
      connect: [{ id: 24 }, { id: 42 }],
    },
  },
});

Key rules: - You can use either the direct foreign key assignment (e.g., userId: 42) or the connect syntax (e.g., user: { connect: { id: 42 } }), but not both in the same query. Mixing them causes errors or unexpected behavior. - If you use connect for one relation in a query, you must use connect for all relations in that query—do not mix direct foreign key assignment and connect in the same data object. If you do, Prisma switches to "unchecked" mode and disables connect for the rest of the fields, which is a common source of confusion and errors [source] [docs]. - If the record you try to connect to does not exist, Prisma will throw an error. Why does connect sometimes not work? - If you use a direct foreign key (e.g., addressId: ...) for one relation and connect for another (e.g., address: { connect: ... }), Prisma will not allow this mix and will throw a type error or ignore the connect [source]. - Always use the same approach for all relations in a single query. Summary:
Use connect for all relations in a query if you want to use it. Do not mix direct foreign key assignment and connect in the same ope ration. If you follow this, connect will work reliably for all relations, including user and institute/address cases. If it doesn't, check for mixed usage or missing related records. 🤔 Alright, thanks for letting us know that there's still some help needed. A team member will reply to you shortly. In the meantime, please let us know any additional info, questions, or which parts of the answer may need clarification.

Nurul•2mo ago

Hi! Can you elaborate on what exactly caused the confusion? It would be helpful if you can share your schema file in text format here so that I can share an example on how connect query would work. https://www.prisma.io/docs/orm/reference/prisma-client-reference#connect

Prisma Client API | Prisma Documentation

API reference documentation for Prisma Client.

Sheik MostafizurOP•2mo ago

Please check this md file.

prisma-nesting-conne...

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How to use connect with relations in Prisma (normal case explained)

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