给定以下文档结构:
{
"_key": "abc",
"_id": "abc",
"label": "Company ABC",
"departments": [
{
"name": "Department 123",
"id": "123"
},
{
"name": "Department 456",
"id": "456"
}
]
}
您能告诉我为什么以下查询不起作用吗?错误消息是“缺少文档 key ”。我在另一个 SO ( ArangoDB AQL: Update single object in embedded array ) 中发现了一个更长、更复杂的解决方法,但我很好奇这个更简单的查询到底出了什么问题。
FOR c IN company
FOR d in c.deparments
FILTER d.id == “456”
UPDATE d WITH { name: “Department 789” } IN company
RETURN d
最佳答案
目前,我只知道如何更新 ArangoDB 中的顶级属性。虽然我希望将来有一些替代方案引起我的注意,但这里有一些适合您的情况的选项。
使用合并更新
在此示例中,我们通过重写数组并在满足条件时使用 MERGE
函数来更新顶级 departments
属性。
LET company = DOCUMENT("companies/abc")
UPDATE company WITH {
departments:
(FOR department IN company.departments
RETURN department.id == "456" ?
MERGE(department, {name: "Department 789"}) : department)
} IN companies
使用替代数据模型
上面的示例假设部门数据嵌入在公司文档中。考虑以下因素:
“公司”集合
{
"_key": "abc",
"_id": "companies/abc",
"label": "Company ABC"
}
“部门”集合(单独的文档)
{
"_key": "456",
"_id": "departments/456",
"company": "companies/abc",
"name": "Department 456"
}
{
"_key": "123",
"_id": "departments/123",
"company": "companies/abc",
"name": "Department 123"
}
获取公司 #ABC 及其部门:
LET company = DOCUMENT("companies/abc")
LET departments =
(FOR department IN departments
FILTER department.company == company._id
RETURN department)
RETURN MERGE(company, {departments})
结果:
{
"_id": "companies/abc",
"_key": "abc",
"label": "Company ABC",
"departments": [
{
"_key": "456",
"_id": "departments/456",
"company": "companies/abc",
"name": "Department 456"
},
{
"_key": "123",
"_id": "departments/123",
"company": "companies/abc",
"name": "Department 123"
}
]
}
更新部门#456:
LET department = DOCUMENT("departments/456")
UPDATE department WITH {name: "Department 789"} IN departments
请注意,您需要在 departments
集合中的 company
属性上添加索引。您可以在此处获取有关索引的详细信息:
https://docs.arangodb.com/3.3/Manual/Indexing/WhichIndex.html
您必须权衡这两种模型的优缺点。
关于ArangoDB/AQL 更新嵌套文档,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48955791/