如何删除prisma中所有相关记录的记录

Question

我知道 the documentation of prisma-client 中有一些部分与我的问题相关：

但是，我无法理解如何在 (JavaScript) prisma-client 中删除一条记录及其所有相关记录。

比如我的datamodel是这样的：

type Board {
  id: ID! @unique
  createdAt: DateTime!
  updatedAt: DateTime!
  owner: User! @relation(name: "BoardOwnershipRelation")
  title: String!
  description: String
  taskGroups: [TaskGroup!]!
}

type TaskGroup {
  id: ID! @unique
  createdAt: DateTime!
  updatedAt: DateTime!
  owner: User! @relation(name: "TaskGroupOwnershipRelation")
  board: Board!
  title: String!
  description: String
  precedence: Int
  tasks: [Task!]!
}

type Task {
  id: ID! @unique
  createdAt: DateTime!
  updatedAt: DateTime!
  owner: User! @relation(name: "TaskOwnershipRelation")
  taskGroup: TaskGroup!
  title: String!
  description: String
  dueDate: DateTime
  precedence: Int
  items: [TaskItem!]!
  assignedTo: [User!]! @relation(name: "AssignmentRelation")
}

type TaskItem {
  id: ID! @unique
  createdAt: DateTime!
  updatedAt: DateTime!
  owner: User! @relation(name: "TaskItemOwnershipRelation")
  task: Task!
  title: String!
  description: String
  checked: Boolean!
  precedence: Int
}

如何我可以删除一个板及其所有相关的任务组、任务和任务项吗？！

编辑:

我最近尝试了这个解决方案，效果也很好。

// e.g. this is in my GraphQL resolvers async function...

await prisma.deleteManyTaskItems({
  task: {
    taskGroup: {
      board: {
        id: boardId
      }
    }
  }
});

await prisma.deleteManyTasks({
  taskGroup: {
    board: {
      id: boardId
    }
  }
});

await prisma.deleteManyTaskGroups({
  board: {
    id: boardId
  }
});

return await prisma.deleteBoard({ id: boardId });

但是，我的问题有更好的解决方案吗？？？

Answer 1

您可以使用@relation 指令的 "onDelete" 参数指定删除实体时发生的情况 (documentation)

您只需像这样更改您的数据模型：

type Board {
  id: ID! @unique
  createdAt: DateTime!
  updatedAt: DateTime!
  owner: User! @relation(name: "BoardOwnershipRelation")
  title: String!
  description: String
  taskGroups: [TaskGroup!]! @relation(name: "BoardTaskGroups" onDelete: CASCADE)
}

type TaskGroup {
  id: ID! @unique
  createdAt: DateTime!
  updatedAt: DateTime!
  owner: User! @relation(name: "TaskGroupOwnershipRelation")
  board: Board! @relation(name: "BoardTaskGroups")
  title: String!
  description: String
  precedence: Int
  tasks: [Task!]! @relation(name: "TaskGroupsTask" onDelete: CASCADE)
}

type Task {
  id: ID! @unique
  createdAt: DateTime!
  updatedAt: DateTime!
  owner: User! @relation(name: "TaskOwnershipRelation")
  taskGroup: TaskGroup! @relation(name: "TaskGroupsTask")
  title: String!
  description: String
  dueDate: DateTime
  precedence: Int
  items: [TaskItem!]! @relation(name: "TaskTaskItem" onDelete: CASCADE)
  assignedTo: [User!]! @relation(name: "AssignmentRelation")
}

type TaskItem {
  id: ID! @unique
  createdAt: DateTime!
  updatedAt: DateTime!
  owner: User! @relation(name: "TaskItemOwnershipRelation")
  task: Task! @relation(name: "TaskTaskItem")
  title: String!
  description: String
  checked: Boolean!
  precedence: Int
}

然后删除你的看板。所有其他删除将由 Prisma

完成

如何删除prisma中所有相关记录的记录

How to delete a record with all relevant records in prisma

prisma