删除

考虑以下类型定义

type Post {
    id: ID! @id
    content: String!
    creator: User! @relationship(type: "HAS_POST", direction: IN)
}

type User {
    id: ID! @id
    name: String
    posts: [Post!]! @relationship(type: "HAS_POST", direction: OUT)
}

将生成以下delete 变异和响应类型

type DeleteInfo {
    nodesDeleted: Int!
    relationshipsDeleted: Int!
}

type Mutation {
    deletePosts(where: PostWhere, delete: PostDeleteInput): DeleteInfo!
    deleteUsers(where: UserWhere, delete: UserDeleteInput): DeleteInfo!
}

DeleteInfo 类型是所有删除变异的通用返回类型。

单个delete

您可以通过执行以下 GraphQL 语句删除单个帖子

mutation {
    deletePosts(where: {
        id: "6042E807-47AE-4857-B7FE-1AADF522DE8B"
    }) {
        nodesDeleted
        relationshipsDeleted
    }
}

这使用在帖子创建后返回的自动生成的 ID 删除帖子。因此，nodesDeleted 等于 1（帖子），relationshipsDeleted 也等于 1，因为Post与其作者之间的HAS_POST 关系已删除。

嵌套delete

如果您想删除User及其所有帖子，可以使用单个嵌套delete 变异

mutation {
  deleteUsers(where: { name: "Jane Doe" }, delete: { posts: {} }) {
    nodesDeleted
    relationshipsDeleted
  }
}