Prisma2 Error: Invalid `prisma.post.create()` invocation: Unknown arg `tags` in data.tags for type PostUncheckedCreateInput - graphql

Question

I want to create a post with a list of tags attached to it. The models are connected many-to-many (one post can have several tags, and one tag can have several posts in it).
Here are my prisma models:
model Post {
id String #id #default(cuid())
slug String #unique
title String
body String
tags Tag[]
}
model Tag {
id String #id #default(cuid())
posts Post[]
name String
slug String #unique
}
And here's a mutation where I'm trying to create a post, and attach tags to it:
t.field('createPost', {
type: 'Post',
args: {
title: nonNull(stringArg()),
body: stringArg(),
tags: list(arg({ type: 'TagInput' }))
},
resolve: async (_, args, context: Context) => {
// Create tags if they don't exist
const tags = await Promise.all(
args.tags.map((tag) =>
context.prisma.tag.upsert({
create: omit(tag, "id"),
update: tag,
where: { id: tag.id || "" },
})
)
)
return context.prisma.post.create({
data: {
title: args.title,
body: args.body,
slug: `${slugify(args.title)}-${cuid()}`,
// Trying to connect a post to an already existing tag
// Without the "tags: {...} everything works
tags: {
set: [{id:"ckql6n0i40000of9yzi6d8bv5"}]
},
authorId: getUserId(context),
published: true, // make it false once Edit post works.
},
})
},
})
This doesn't seem to be working.
I'm getting an error:
Invalid `prisma.post.create()` invocation:
{
data: {
title: 'Post with tags',
body: 'Post with tags body',
slug: 'Post-with-tags-ckql7jy850003uz9y8xri51zf',
tags: {
connect: [
{
id: 'ckql6n0i40000of9yzi6d8bv5'
}
]
},
}
}
Unknown arg `tags` in data.tags for type PostUncheckedCreateInput. Available args:
type PostUncheckedCreateInput {
id?: String
title: String
body: String
slug: String
}
It seems like the tags field on the post is missing? But I did run prisma generate and prisma migrate. Also I can successfully query tags on a post if I add them manually using Prisma Studio. What could be causing this issue?

Answer 1

You need to use connect for the author as well. So the following will work fine:
return context.prisma.post.create({
data: {
title: args.title,
body: args.body,
slug: `${slugify(args.title)}-${cuid()}`,
// Trying to connect a post to an already existing tag
// Without the "tags: {...} everything works
tags: {
set: [{id:"ckql6n0i40000of9yzi6d8bv5"}]
},
author: { connect: { id: getUserId(context) } },
published: true, // make it false once Edit post works.
},
})

Answer 2

In my case, the issue arose when I created a new field on the prisma model called uid and tried to run the command prisma migrate dev
It brought the error
Error:
⚠️ We found changes that cannot be executed:
• Step 0 Added the required column `uid` to the `Transactions` table without a default value. There are 1 rows in this table, it is not possible to execute this step.
You can use prisma migrate dev --create-only to create the migration file, and manually modify it to address the underlying issue(s).
Then run prisma migrate dev to apply it and verify it works.
I solved it by adding the #default("") to it.
model Transactions {
id Int #id #default(autoincrement())
uid String #default("")
account String
description String
category String
reference String
currency String #default("GBP")
amount String
status String
transactionDate String
createdAt String
updatedAt String
}