如何删除与PRISMA所有相关记录的记录

Question

我知道，有在the documentation of prisma-client有关我的问题的一些章节：

• deleting objects
• updating and deleting many records

但是，我不明白，我怎么能删除一条记录与（JavaScript）的PRISMA客户端与其相关的全部记录。

例如，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
}

我如何删除董事会及其所有相关TaskGroups，任务和TaskItems？！

编辑：

我最近尝试了这种解决方案，这也是行之有效的。

// 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，有没有我的任何问题更好的解决方案？？？

Answer 1

您可以使用@relation指令的“onDelete”参数来指定会发生什么，当你删除一个实体（documentation）

你只需要改变你的数据模型，如下所示：

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
}

然后删除您的主板。所有其他的缺失将由Prisma的完成