Extend Existing Models

Goals:

• Add a model at schema.prisma.

• Extend it with the Custom Entity Builder.

Steps

💿 First, open the schema.prisma file and add the following model:

model JobPost {
  id     String  @id @default(cuid())
  rowId  String  @unique
  row    Row     @relation(fields: [rowId], references: [id], onDelete: Cascade)
  title  String
  type   String // Fixed - Hourly
  budget Decimal
}

💿 On the Row model, add 2 properties:

• jobPostId - Nullable String? (not all Rows will be job posts)

• jobPost - Nullable JobPost?

model Row {
  id                String         @id @default(cuid())
  ...
  jobPostId         String?
  jobPost           JobPost?
}

This property name will be important, so take note if you have jobPost or JobPost.

💿 Add a migration to update the database:

npx prisma migrate dev --name added_job_post_model

💿 Start your app, and add the JobPost Custom Entity.

WARNING

The name value should be the same as the one on the Row model (jobPost or JobPost).

💿 For each field, click on Show advanced options and set Is dynamic to false.

You should have at least these 3 properties:

💿 Add a Job Post.

There will be an error, since we're trying to access the properties for an object that is not included on the database query (e.g. row.jobPost.title).

💿 Add the jobPost property to the includeRowDetails constant:

export const includeRowDetails = {
+ jobPost: true,
  createdByUser: true,

💿 Reload the job post.

💿 List all the Job Posts.

💿 Update all the fields.

💿 Open a new terminal window an run prisma studio to browser the JobPosts model/table rows.

npx prisma studio

💿 Finally, delete the job post.

I hope this quick guide was useful! Let me know if you have any questions.