dgraph - 查询节点，使用子节点（关系）的 uid 进行过滤

Question

如果有一个与用户模式（user_id）和发布模式（object_id）有关系的模式“Like”。如何查询具有user_id = (some_uid)和的“Like”节点object_id = (some_uid)。

我正在使用dgraph-io/dgraph-js。

User Schema               Post Schema             Like Schema

uid                       uid                     uid
first_name                type                    object_id (maps post)
last_name                 content                 user_id (maps user)
email                     title
created_at

Answer 1

尝试这个

{
  likes(func: has(like.object_id)) @filter(uid_in(like.object_id, 0x2) and uid_in(like.user_id, 0x3)){
    like.object_id {
      uid
      post.type
      post.content
      post.title
    }
    like.user_id{
      uid
      user.email
      user.first_name
      user.last_name
    }
  }
}