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[英]Why vertex removing request doesn't remove linked edge with AQL in Arangodb?
[英]ArangoDB insert edge doesn't exists
我想在docment集合C1和C3之间创建独特的优势。
唯一约束是id和kid 。
我使用flow aql来创建它,但是我在同一个id和kid中获得了多个边缘。
我怎么能实现它? 对不起我可怜的英语:)
for i in C1 filter i.id != null and i.id != '' let exist = first( for c in C2 filter i.id == c.id and i.kid == c.kid limit 1 return c ) filter exist == null let result = first( for h in C3 filter i.kid == h.kid limit 1 return h ) insert{_from:i._id, _to:result._id, id:i.id, kid:i.kid} INTO C2
我的英语也不太好^)! 但我想,我知道你犯了哪些错误。 首先,对于您的两个集合,您可以使用以下代码:
LET data = [
{"parent":{"ID":"YOU_MUST_WRITE_HERE_ID_C1"},"child":{"KID":"YOU_MUST_WRITE_HERE_KID_C3"}},
{"parent":{"ID":"YOU_MUST_WRITE_HERE_NEXT_ID_C1"},"child":{"KID":"YOU_MUST_WRITE_HERE_NEXT_KID_C3"}}
]
FOR rel in data
LET parentId = FIRST(
FOR c IN C1
FILTER c.GUID == rel.parent.ID
LIMIT 1
RETURN c._id
)
LET childId = FIRST(
FOR c IN C3
FILTER c.GUID == rel.child.KID
LIMIT 1
RETURN c._id
)
FILTER parentId != null AND childId != null
INSERT { _from: childId, _to: parentId } INTO C2
RETURN NEW
我希望它对你有所帮助。
第二 - 为什么在这个片段中使用С2集合?
let exist = first(
for c in C2
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