How can I assign some tags to the post using Prisma.js?
I have some tags already and I want to assign some tags to the post? I don't want to create a new tag.
schema.prisma:
model Post {
Id String @id @default(uuid())
AuthorId String
Author User @relation(fields: [AuthorId], references: [Id])
CategoryId String?
Category Category? @relation(fields: [CategoryId], references: [Id])
Title String @db.VarChar(255)
Description String? @db.MediumText
Summary String? @db.VarChar(255)
Tags TagPostMapping[]
}
model TagPostMapping {
Id String @id @default(uuid())
Post Post? @relation(fields: [PostId], references: [Id])
PostId String?
Tag Tag? @relation(fields: [TagId], references: [Id])
TagId String?
CreatedDate DateTime @default(now())
ModifiedDate DateTime? @updatedAt
}
model Tag {
Id String @id @default(uuid())
Title String @unique
Posts TagPostMapping[]
CreatedDate DateTime @default(now())
ModifiedDate DateTime? @updatedAt
}
In the Prisma website, there is an example but it's suitable for creating some tags and assign them to the Post. While I want to add some of the existing tags to the article.
I have used $transaction and in this transaction I created 2 insert command also I have defined an Id for post with uuid package. postId = v4() . v4() is a function in uuid that generates a unique Id.
public async Create(post: IPost): Promise<Post> {
let postId = v4();
let postTagIds: postTagMapping[] = [];
post.Tags?.map(tag => postTagIds.push({ PostId: postId, TagId: tag.Id }));
const transResult = await ApplicationDbContext.Prisma.$transaction([
ApplicationDbContext.Prisma.post.create({
data: {
Id: postId,
Title: post.Title,
Summary: post.Summary,
Description: post.Description,
IsActive: post.IsActive,
IsPublished: post.IsPublished,
IsActiveNewComment: post.IsActiveNewComment,
AuthorId: post.AuthorId,
CategoryId: post.CategoryId,
},
}),
ApplicationDbContext.Prisma.tagPostMapping.createMany({
data: postTagIds
})
]).finally(async () => {
await ApplicationDbContext.Prisma.$disconnect();
});
let result = transResult as unknown as Post;
return result;
}