Relational query error: "Cannot read properties of null (reading 'map')"

Hi, have an issue and was wondering if anyone has stumbled upon a similar thing? When doing a query like:

  findWorkOrderById(id: number): Promise<WorkOrderEntity | undefined> {
    return this.db.instance.query.gisTasks.findFirst({
      where: eq(gisTasks.id, id),
      columns: {
        assignedToId: false,
      },
      with: {
        gisAttachments: {
          with: {
            miUser: {
              columns: {
                id: true,
                forename: true,
                lastname: true,
              },
            },
          },
        },
       // ...other relations that works
      },
    })
  }

  findWorkOrderById(id: number): Promise<WorkOrderEntity | undefined> {
    return this.db.instance.query.gisTasks.findFirst({
      where: eq(gisTasks.id, id),
      columns: {
        assignedToId: false,
      },
      with: {
        gisAttachments: {
          with: {
            miUser: {
              columns: {
                id: true,
                forename: true,
                lastname: true,
              },
            },
          },
        },
       // ...other relations that works
      },
    })
  }

I get the following error : (see pic for full error) The Cannot read properties of null (reading 'map') at Object.mapRelationalRow.... error appears when trying to make a relational one-to-many queries. The thing is, the error only happens when there is no gisAttachments with reference id to the workorder. But when there is one it works. I expect it to return an empty array, but drizzle throws this error. Relation definition:

export const gisAttachmentsRelations = relations(gisAttachments, ({ one }) => ({
  task: one(gisTasks, {
    fields: [gisAttachments.taskId],
    references: [gisTasks.id],
  }),
  miUser: one(miUsers, {
    fields: [gisAttachments.userId],
    references: [miUsers.id],
  }),
}))
export const gisTasksRelations = relations(gisTasks, ({ one, many }) => ({
  gisAttachments: many(gisAttachments),
  assignedTo: one(miUsers, {
    fields: [gisTasks.assignedToId],
    references: [miUsers.id],
  }),
// other 'one' relation definitions
}))

export const gisAttachmentsRelations = relations(gisAttachments, ({ one }) => ({
  task: one(gisTasks, {
    fields: [gisAttachments.taskId],
    references: [gisTasks.id],
  }),
  miUser: one(miUsers, {
    fields: [gisAttachments.userId],
    references: [miUsers.id],
  }),
}))
export const gisTasksRelations = relations(gisTasks, ({ one, many }) => ({
  gisAttachments: many(gisAttachments),
  assignedTo: one(miUsers, {
    fields: [gisTasks.assignedToId],
    references: [miUsers.id],
  }),
// other 'one' relation definitions
}))

Thank you in advance for the assistance!

2 Replies

Mykhailo•11mo ago

Hello, @strandhvilliam! Could you please provide your full schema and drizzle-orm version? I tested with my similar code and can't reproduce the issue.

Villiam StrandhOP•10mo ago

export const gisTasks = mysqlTable(
  'gis_tasks',
  {
    id: int('ID').autoincrement().notNull(),
    siteNumber: tinyint('SiteNumber').default(1).notNull(),
    status: tinyint('Status').default(0).notNull(),
    createdDate: datetime('CreatedDate', { mode: 'string' })
      .default(sql`CURRENT_TIMESTAMP`)
      .notNull(),
    assignedTo: int('AssignedTo').notNull(),
    updatedDate: datetime('UpdatedDate', { mode: 'string' })
      .default(sql`CURRENT_TIMESTAMP`)
      .notNull(),
  },
  table => {
    return {
      gisTasksId: primaryKey(table.id),
    }
  }
)

export const gisAttachments = mysqlTable(
  'gis_attachments',
  {
    id: int('ID').autoincrement().notNull(),
    taskId: int('TaskID').notNull(),
    updatedDate: datetime('UpdatedDate', { mode: 'string' })
      .default(sql`CURRENT_TIMESTAMP`)
      .notNull(),
    userId: int('UserID').default(0).notNull(),
    type: int('Type').notNull(),
    data: varchar('Data', { length: 255 }).notNull(),
  },
  table => {
    return {
      fkGisAttachmentTask: index('FK_gis_attachment_task').on(table.taskId),
      gisAttachmentsId: primaryKey(table.id),
    }
  }
)

export const gisTasks = mysqlTable(
  'gis_tasks',
  {
    id: int('ID').autoincrement().notNull(),
    siteNumber: tinyint('SiteNumber').default(1).notNull(),
    status: tinyint('Status').default(0).notNull(),
    createdDate: datetime('CreatedDate', { mode: 'string' })
      .default(sql`CURRENT_TIMESTAMP`)
      .notNull(),
    assignedTo: int('AssignedTo').notNull(),
    updatedDate: datetime('UpdatedDate', { mode: 'string' })
      .default(sql`CURRENT_TIMESTAMP`)
      .notNull(),
  },
  table => {
    return {
      gisTasksId: primaryKey(table.id),
    }
  }
)

export const gisAttachments = mysqlTable(
  'gis_attachments',
  {
    id: int('ID').autoincrement().notNull(),
    taskId: int('TaskID').notNull(),
    updatedDate: datetime('UpdatedDate', { mode: 'string' })
      .default(sql`CURRENT_TIMESTAMP`)
      .notNull(),
    userId: int('UserID').default(0).notNull(),
    type: int('Type').notNull(),
    data: varchar('Data', { length: 255 }).notNull(),
  },
  table => {
    return {
      fkGisAttachmentTask: index('FK_gis_attachment_task').on(table.taskId),
      gisAttachmentsId: primaryKey(table.id),
    }
  }
)

Thank you @solo ! Here is the relevant schema code. We are currently running "drizzle-kit": "^0.19.13", and "drizzle-orm": "^0.28.6".

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Relational query error: "Cannot read properties of null (reading 'map')"