ArangoDB

Question

我正在两个文档之间创建边 "has_taken"，如下所示：

sin_graph.createEdge("has_taken", userDoc._id, tripDoc._id, edgeAttributes={})

我收到以下错误：

File "/Library/Python/2.7/site-packages/pyArango/graph.py", line 135, in createEdge raise CreationError("Unable to create edge, %s" % r.json()["errorMessage"], data) CreationError: Unable to create edge, collection not found. Errors: {u'code': 404, u'errorNum': 1203, u'errorMessage': u'collection not found', u'error': True}

名称为 "has_taken" 的集合存在，但出现上述错误。

Answer 1

我已将 social graph example 示例转译为 pyArango；它说明了使用它维护图形数据时要做的事情的顺序：

#!/usr/bin/python
import sys
from pyArango.connection import *
from pyArango.graph import *
from pyArango.collection import *


class Social(object):
        class male(Collection) :
            _fields = {
                "name" : Field()
            }

        class female(Collection) :
            _fields = {
                "name" : Field()
            }

        class relation(Edges) :
            _fields = {
                "number" : Field()
            }

        class social(Graph) :

            _edgeDefinitions = (EdgeDefinition ('relation',
                                                fromCollections = ["female", "male"],
                                                toCollections = ["female", "male"]),)
            _orphanedCollections = []


        def __init__(self):
               self.conn = Connection(username="root", password="")

               self.db = self.conn["_system"]
               if self.db.hasGraph('social'):
                   raise Exception("The social graph was already provisioned! remove it first")

               self.female   = self.db.createCollection("female")
               self.male     = self.db.createCollection("male")

               self.relation = self.db.createCollection("relation")

               g = self.db.createGraph("social")

               a = g.createVertex('female', {"name": 'Alice',  "_key": 'alice'});
               b = g.createVertex('male',  {"name": 'Bob',    "_key": 'bob'});
               c = g.createVertex('male',   {"name": 'Charly', "_key": 'charly'});
               d = g.createVertex('female', {"name": 'Diana',  "_key": 'diana'});
               a.save()
               b.save()
               c.save()
               d.save()

               g.link('relation', a, b, {"type": 'married', "_key": 'aliceAndBob'})
               g.link('relation', a, c, {"type": 'friend', "_key": 'aliceAndCharly'})
               g.link('relation', c, d, {"type": 'married', "_key": 'charlyAndDiana'})
               g.link('relation', b, d, {"type": 'friend', "_key": 'bobAndDiana'})


Social()

Answer 2

我想可能是因为你做了一个Collection类型的collection而不是Edge类型的（哈哈，迷惑，我知道。）

但是在制作名为 "has_taken" 的集合时，而不是

db.createCollection(className="Collection", name="has_taken")

尝试

db.createCollection(className="Edges", name="has_taken")

我在阅读 this 页面时注意到了这一点。（单击 link 时请查看屏幕顶部。函数及其描述就在上面，其中提到了这种差异。）

createCollection(className='Collection', waitForSync=False, **colArgs)[source]
Creates a collection and returns it. ClassName the name of a class inheriting from Collection or Egdes, it can also be set to ‘Collection’ or ‘Edges’ in order to create untyped collections of documents or edges.

ArangoDB - 虽然创建了集合但找不到集合错误

ArangoDB - Collection not found error though the collection is created

python

pyarango