How to declare optional one-to-one relationship

I have 2 tables that relate to each other in an inverse manner:

export const users = createTable('users', {
  id: text('id').primaryKey(),
  email: text('email').notNull().unique(),
})

export const profiles = createTable('profiles', {
  userId: text('user_id')
    .notNull()
    .primaryKey()
    .references(() => users.id),
  firstName: text('first_name').notNull(),
  lastName: text('last_name').notNull(),
})

export const usersRelations = relations(users, ({ one }) => ({
  profile: one(profiles, {
    fields: [users.id],
    references: [profiles.userId],
  }),
}))

export const profilesRelations = relations(profiles, ({ one }) => ({
  user: one(users, {
    fields: [profiles.userId],
    references: [users.id]
  }),
}))

export const users = createTable('users', {
  id: text('id').primaryKey(),
  email: text('email').notNull().unique(),
})

export const profiles = createTable('profiles', {
  userId: text('user_id')
    .notNull()
    .primaryKey()
    .references(() => users.id),
  firstName: text('first_name').notNull(),
  lastName: text('last_name').notNull(),
})

export const usersRelations = relations(users, ({ one }) => ({
  profile: one(profiles, {
    fields: [users.id],
    references: [profiles.userId],
  }),
}))

export const profilesRelations = relations(profiles, ({ one }) => ({
  user: one(users, {
    fields: [profiles.userId],
    references: [users.id]
  }),
}))

If I go ahead and create a user without a profile in Studio, no error is shown. However, when I run the following script during runtime, unexpected errors may appear.

const user = await db.query.users.findFirst({
  with: {
    profile: {
      columns: { firstName: true }
    }
  },
})

user //? { id: string; email: string; profile: { firstName: string } } | undefined

console.log(user?.profile.firstName) // No TypeScript error appears because it assumes profile always exists

// Runtime error: null is not an object (evaluating 'user?.profile.firstName')

const user = await db.query.users.findFirst({
  with: {
    profile: {
      columns: { firstName: true }
    }
  },
})

user //? { id: string; email: string; profile: { firstName: string } } | undefined

console.log(user?.profile.firstName) // No TypeScript error appears because it assumes profile always exists

// Runtime error: null is not an object (evaluating 'user?.profile.firstName')

I understand that I could fix this by updating my schema relationships and linking a profile ID in the users table but, given that I have many tables that relate to individual users where table information may or may not exist (e.g. profile, KYC data, KYB data, etc.), I thought this would be the best way to design it.

1 Reply

MarcelOP•4w ago

UPDATE: Just realized that if I omit the field information from usersRelations, it will infer profile relationship correctly to Profile | null.

// new relations variables
export const usersRelations = relations(users, ({ one }) => ({
  profile: one(profiles),
}))

export const profilesRelations = relations(profiles, ({ one }) => ({
  user: one(users, {
    fields: [profiles.userId],
    references: [users.id]
  }),
}))

// new relations variables
export const usersRelations = relations(users, ({ one }) => ({
  profile: one(profiles),
}))

export const profilesRelations = relations(profiles, ({ one }) => ({
  user: one(users, {
    fields: [profiles.userId],
    references: [users.id]
  }),
}))

Please let me know if I should close this

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How to declare optional one-to-one relationship