def createPaths():
#Connect to Neo4j Database
graph = connectGraph()
#Let us define few Nodes
bradley, matthew, lisa = Node(name="Bradley"), Node(name="Matthew"), Node(
name="Lisa")
#Connect these Node and form a Path
path_1 = Path(bradley, "Knows", matthew, Rev("Knows"), lisa)
#Let us create this Path on the server
graph.create(path_1)
#Let us create some more Nodes
john, annie, ripley = Node(name="John"), Node(name="Annie"), Node(
name="Ripley")
#Define another Path for these New Nodes
path_2 = Path(john, "Knows", annie, "Knows", ripley)
#Now, we will join path_1 and path_2 using function append(), and it will give us a new path
path_3 = path_1.append("Knows", path_2)
#Let us Create this new path in the server
resultPath = graph.create(path_3)
#Now we will print and see the results on the Console
print("Print Raw Data")
print("Nodes in the Path-1 = ", resultPath[0].nodes)
print("Relationships in the Path-1 = ", resultPath[0].relationships)
print("Print - All Relationships")
for rels in resultPath[0].relationships:
print(rels)
def test_path_inequality():
alice = Node(name="Alice")
bob = Node(name="Bob")
carol = Node(name="Carol")
dave = Node(name="Dave")
path_1 = Path(alice, "LOVES", bob, Rev("HATES"), carol, "KNOWS", dave)
path_2 = Path(alice, "KNOWS", carol, Rev("KNOWS"), dave)
assert path_1 != path_2
def test_path_equality(graph):
alice = Node(name="Alice")
bob = Node(name="Bob")
carol = Node(name="Carol")
dave = Node(name="Dave")
path_1 = Path(alice, "LOVES", bob, Relationship(carol, "HATES", bob), carol, "KNOWS", dave)
path_2 = Path(alice, "LOVES", bob, Relationship(carol, "HATES", bob), carol, "KNOWS", dave)
assert path_1 == path_2
def test_path_hashes(graph):
p1 = Path(Node("Person", name="Alice"), Rel("KNOWS", since=1999),
Node("Person", name="Bob"))
p2 = Path(Node("Person", name="Alice"), Rel("KNOWS", since=1999),
Node("Person", name="Bob"))
assert hash(p1) == hash(p2)
graph.create(p1)
assert hash(p1) != hash(p2)
def test_can_hydrate_path_into_existing_instance(graph):
alice = Node("Person", name="Alice", age=33)
bob = Node("Person", name="Bob", age=44)
dehydrated = graph.cypher.post("CREATE p=()-[:KNOWS]->() RETURN p").content["data"][0][0]
path = Path(alice, "KNOWS", bob)
if "directions" not in dehydrated:
dehydrated["directions"] = ["->"]
hydrated = Path.hydrate(dehydrated, inst=path)
assert hydrated is path
class GregorianDate(object):
""" A date picked from a :class:`.GregorianCalendar`.
"""
#: The calendar from which this date was picked.
calendar = None
#: The graph associated with this date.
graph = None
#: Full :class:`Path <py2neo.Path>` representing this date.
path = None
def __init__(self, calendar, year, month=1, day=1):
self.calendar = calendar
self.graph = self.calendar.graph
self.path = Path(
self.calendar.root, "YEAR",
Node("Year", key='%04d' % year, year=year), "MONTH",
Node("Month",
key='%04d-%02d' % (year, month),
year=year,
month=month), "DAY",
Node("Day",
key='%04d-%02d-%02d' % (year, month, day),
year=year,
month=month,
day=day))
self.graph.merge(self.path)
@property
def year(self):
""" The year node for this date.
:rtype: :class:`py2neo.Node`
"""
return self.path.nodes()[1]
@property
def month(self):
""" The month node for this date.
:rtype: :class:`py2neo.Node`
"""
return self.path.nodes()[2]
@property
def day(self):
""" The day node for this date.
:rtype: :class:`py2neo.Node`
"""
return self.path.nodes()[3]
def test_path_addition():
alice = Node(name="Alice")
bob = Node(name="Bob")
carol = Node(name="Carol")
assert alice + alice == Path(alice)
assert alice + "KNOWS" == Path(alice, "KNOWS", None)
assert alice + "KNOWS" + bob == Path(alice, "KNOWS", bob)
assert alice + Rev("KNOWS") + bob == Path(alice, Rev("KNOWS"), bob)
assert ((alice + "KNOWS" + bob) + (bob + "KNOWS" + carol) == Path(
alice, "KNOWS", bob, "KNOWS", carol))
def test_path_inequality(self):
alice = Node(name="Alice")
bob = Node(name="Bob")
carol = Node(name="Carol")
dave = Node(name="Dave")
path_1 = Path(alice, "LOVES", bob, Relationship(carol, "HATES", bob),
carol, "KNOWS", dave)
path_2 = Path(alice, "KNOWS", carol,
Relationship(dave, "KNOWS", carol), dave)
assert path_1 != path_2
assert path_1 != ""
def test_can_create_path(self, graph):
path = Path({"name": "Alice"}, "KNOWS", {"name": "Bob"})
assert path.nodes[0] == {"name": "Alice"}
assert path.rels[0].type == "KNOWS"
assert path.nodes[1] == {"name": "Bob"}
path = path.create(graph)
assert isinstance(path.nodes[0], Node)
assert path.nodes[0]["name"] == "Alice"
assert isinstance(path.relationships[0], neo4j.Relationship)
assert path.relationships[0].type == "KNOWS"
assert isinstance(path.nodes[1], Node)
assert path.nodes[1]["name"] == "Bob"
def test_can_make_new_path_from_path(self, alice, bob, carol, dave):
# given
path = Path(alice, "LOVES", bob, Rev("HATES"), carol, "KNOWS", dave)
# when
new_path = Path(path)
# then
new_rels = list(new_path)
assert new_rels == [
Relationship(alice, "LOVES", bob),
Relationship(carol, "HATES", bob),
Relationship(carol, "KNOWS", dave),
]
def test_node_degree(self):
alice = Node("Person", name="Alice")
bob = Node("Person", name="Bob")
carol = Node("Person", name="Carol")
self.graph.create(alice)
assert alice.degree() == 0
self.graph.create(Path(alice, "KNOWS", bob))
assert alice.degree() == 1
self.graph.create(Path(alice, "KNOWS", carol))
assert alice.degree() == 2
self.graph.create(Path(carol, "KNOWS", alice))
assert alice.degree() == 3
def test_can_join_paths(self):
a = Node(name="Alice")
b = Node(name="Bob")
c = Node(name="Carol")
d = Node(name="Dave")
path1 = Path(a, "KNOWS", b)
path2 = Path(c, "KNOWS", d)
path = Path(path1, "KNOWS", path2)
assert list(path) == [
Relationship(a, 'KNOWS', b),
Relationship(b, 'KNOWS', c),
Relationship(c, 'KNOWS', d),
]
def test_can_create_path(self):
path = Path({"name": "Alice"}, "KNOWS", {"name": "Bob"})
nodes = path.nodes()
assert dict(nodes[0]) == {"name": "Alice"}
assert path[0].type() == "KNOWS"
assert dict(nodes[1]) == {"name": "Bob"}
self.graph.create(path)
assert isinstance(nodes[0], Node)
assert nodes[0]["name"] == "Alice"
assert isinstance(path[0], Relationship)
assert path[0].type() == "KNOWS"
assert isinstance(nodes[1], Node)
assert nodes[1]["name"] == "Bob"
def createFriends(self,graph,people):
print("Creating Relationships between People")
path_1 = Path(people['bradley'],'FRIEND',people['matthew'],'FRIEND',people['lisa'],'FRIEND',people['john'])
path_2 = path_1.prepend(people['lisa'],Rev('FRIEND'))
path_3 = Path(people['annie'],'FRIEND',people['ripley'],'FRIEND',people['lisa'])
path_4 = Path(people['bradley'],'TEACHES',people['matthew'])
friendsPath = graph.create(path_2,path_3,path_4)
print("Finished Creating Relationships between People")
return friendsPath
def test_can_create_path_with_rel_properties(self):
path = Path({"name": "Alice"}, ("KNOWS", {"since": 1999}), {"name": "Bob"})
assert path.nodes[0] == {"name": "Alice"}
assert path.rels[0].type == "KNOWS"
assert path.rels[0].properties == {"since": 1999}
assert path.nodes[1] == {"name": "Bob"}
path = path.create(self.graph)
assert isinstance(path.nodes[0], Node)
assert path.nodes[0]["name"] == "Alice"
assert isinstance(path.relationships[0], neo4j.Relationship)
assert path.relationships[0].type == "KNOWS"
assert path.relationships[0].properties == {"since": 1999}
assert isinstance(path.nodes[1], Node)
assert path.nodes[1]["name"] == "Bob"
def test_can_make_new_path_from_path(self):
# given
path = Path(self.alice, "LOVES", self.bob,
Relationship(self.carol, "HATES", self.bob), self.carol,
"KNOWS", self.dave)
# when
new_path = Path(path)
# then
new_rels = list(new_path)
assert new_rels == [
Relationship(self.alice, "LOVES", self.bob),
Relationship(self.carol, "HATES", self.bob),
Relationship(self.carol, "KNOWS", self.dave),
]
def createFriends(self, graph, people):
print("Creating Relationships between People")
path_1 = Path(people['bradley'], 'FRIEND', people['matthew'], 'FRIEND',
people['lisa'], 'FRIEND', people['john'])
path_2 = path_1.prepend(people['lisa'], Rev('FRIEND'))
path_3 = Path(people['annie'], 'FRIEND', people['ripley'], 'FRIEND',
people['lisa'])
path_4 = Path(people['bradley'], 'TEACHES', people['matthew'])
friendsPath = graph.create(path_2, path_3, path_4)
print("Finished Creating Relationships between People")
return friendsPath
class GregorianDate(object):
""" A date picked from a :class:`.GregorianCalendar`.
"""
#: The calendar from which this date was picked.
calendar = None
#: The graph associated with this date.
graph = None
#: Full :class:`Path <py2neo.Path>` representing this date.
path = None
def __init__(self, calendar, year, month=1, day=1):
self.calendar = calendar
self.graph = self.calendar.graph
self.path = Path(self.calendar.root,
"YEAR", Node("Year", key='%04d' % year, year=year),
"MONTH", Node("Month", key='%04d-%02d' % (year, month), year=year, month=month),
"DAY", Node("Day", key='%04d-%02d-%02d' % (year, month, day), year=year, month=month, day=day))
self.graph.merge(self.path)
@property
def year(self):
""" The year node for this date.
:rtype: :class:`py2neo.Node`
"""
return self.path.nodes()[1]
@property
def month(self):
""" The month node for this date.
:rtype: :class:`py2neo.Node`
"""
return self.path.nodes()[2]
@property
def day(self):
""" The day node for this date.
:rtype: :class:`py2neo.Node`
"""
return self.path.nodes()[3]
def test_can_slice_path(graph):
a = Node(name="Alice")
b = Node(name="Bob")
c = Node(name="Carol")
d = Node(name="Dave")
e = Node(name="Eve")
f = Node(name="Frank")
path = Path(a, "KNOWS", b, "KNOWS", c, "KNOWS", d, "KNOWS", e, "KNOWS", f)
assert len(path) == 5
assert path[0] == Relationship(a, "KNOWS", b)
assert path[1] == Relationship(b, "KNOWS", c)
assert path[2] == Relationship(c, "KNOWS", d)
assert path[-1] == Relationship(e, "KNOWS", f)
assert path[0:2] == Path(a, "KNOWS", b, "KNOWS", c)
assert path[3:5] == Path(d, "KNOWS", e, "KNOWS", f)
assert path[:] == Path(a, "KNOWS", b, "KNOWS", c, "KNOWS", d, "KNOWS", e, "KNOWS", f)
def __init__(self, calendar, year, month=1, day=1):
self.calendar = calendar
self.graph = self.calendar.graph
self.path = Path(
self.calendar.root, "YEAR",
Node("Year", key='%04d' % year, year=year), "MONTH",
Node("Month",
key='%04d-%02d' % (year, month),
year=year,
month=month), "DAY",
Node("Day",
key='%04d-%02d-%02d' % (year, month, day),
year=year,
month=month,
day=day))
self.graph.merge(self.path)
def test_can_push_path(graph):
alice = Node(name="Alice")
bob = Node(name="Bob")
carol = Node(name="Carol")
dave = Node(name="Dave")
path = Path(alice, "LOVES", bob, Relationship(carol, "HATES", bob), carol,
"KNOWS", dave)
graph.create(path)
statement = ("MATCH ()-[ab]->() WHERE id(ab)=$ab "
"MATCH ()-[bc]->() WHERE id(bc)=$bc "
"MATCH ()-[cd]->() WHERE id(cd)=$cd "
"RETURN ab.amount, bc.amount, cd.since")
parameters = {
"ab": path[0].identity,
"bc": path[1].identity,
"cd": path[2].identity
}
path[0]["amount"] = "lots"
path[1]["amount"] = "some"
path[2]["since"] = 1999
ab_amount, bc_amount, cd_since = next(graph.run(statement, parameters))
assert ab_amount is None
assert bc_amount is None
assert cd_since is None
graph.push(path)
ab_amount, bc_amount, cd_since = next(graph.run(statement, parameters))
assert ab_amount == "lots"
assert bc_amount == "some"
assert cd_since == 1999
def test_graph(graph):
alice = Node(name="Alice")
bob = Node(name="Bob")
carol = Node(name="Carol")
dave = Node(name="Dave")
path, = graph.create(Path(alice, "LOVES", bob, Rev("HATES"), carol, "KNOWS", dave))
assert path.graph == Graph("http://localhost:7474/db/data/")
def test_can_construct_simple_path(self):
alice = Node(name="Alice")
bob = Node(name="Bob")
path = Path(alice, "KNOWS", bob)
assert order(path) == 2
assert size(path) == 1
assert len(path) == 1
def test_cannot_build_path_with_two_consecutive_rels():
try:
_ = Path(Node(name="Alice"), Rel("KNOWS"), Rel("KNOWS"), Node(name="Bob"))
except JoinError:
assert True
else:
assert False
def test_can_construct_simple_path(graph):
alice = Node(name="Alice")
bob = Node(name="Bob")
path = Path(alice, "KNOWS", bob)
assert len(path.nodes) == 2
assert len(path.relationships) == 1
assert len(path) == 1
def _createAuthor(pub, names):
graph = connectGraph()
print(' Creating Authors')
for auth in names:
matcher = NodeMatcher(graph)
aNode = matcher.match("Author", name=auth['name']).first()
if aNode is None:
aNode = Node('Author', name=auth['name'])
path_1 = Path(aNode, 'AUTHORED', pub)
graph.create(path_1)
else:
#Check the relationship
rmatcher = RelationshipMatcher(graph)
auNode = rmatcher.match((aNode,pub), "AUTHORED").first()
if auNode is None:
path_1 = Path(aNode, 'AUTHORED', pub)
graph.create(path_1)
def test_can_join_compatible_paths():
alice = Node(name="Alice")
bob = Node(name="Bob")
carol = Node(name="Carol")
path_1 = alice + "KNOWS" + bob
path_2 = bob + "KNOWS" + carol
path_3 = path_1 + path_2
assert path_3 == Path(alice, "KNOWS", bob, "KNOWS", carol)
def __init__(self, calendar, year, month=1, day=1):
self.calendar = calendar
self.graph = self.calendar.graph
self.path = Path(self.calendar.root,
"YEAR", Node("Year", key='%04d' % year, year=year),
"MONTH", Node("Month", key='%04d-%02d' % (year, month), year=year, month=month),
"DAY", Node("Day", key='%04d-%02d-%02d' % (year, month, day), year=year, month=month, day=day))
self.graph.merge(self.path)
def test_node_degree(graph):
alice = Node("Person", name="Alice")
bob = Node("Person", name="Bob")
carol = Node("Person", name="Carol")
try:
_ = alice.degree
except BindError:
assert True
else:
assert False
graph.create(alice)
assert alice.degree == 0
graph.create(Path(alice, "KNOWS", bob))
assert alice.degree == 1
graph.create(Path(alice, "KNOWS", carol))
assert alice.degree == 2
graph.create(Path(carol, "KNOWS", alice))
assert alice.degree == 3
def test_can_create_path(self):
path = Path({"name": "Alice"}, "KNOWS", {"name": "Bob"})
assert len(path) == 1
assert path.nodes[0]["name"] == "Alice"
assert path.rels[0].type == "KNOWS"
assert path.nodes[-1]["name"] == "Bob"
path = Path(path, "KNOWS", {"name": "Carol"})
assert len(path) == 2
assert path.nodes[0]["name"] == "Alice"
assert path.relationships[0].type == "KNOWS"
assert path.nodes[1]["name"] == "Bob"
path = Path({"name": "Zach"}, "KNOWS", path)
assert len(path) == 3
assert path.nodes[0]["name"] == "Zach"
assert path.relationships[0].type == "KNOWS"
assert path.nodes[1]["name"] == "Alice"
assert path.relationships[1].type == "KNOWS"
assert path.nodes[2]["name"] == "Bob"
def _createKeywords(pub, keywords):
graph = connectGraph()
print(' Creating Keywords')
for kw in keywords:
#Find keywords TODO : Check for duplicate on re-run
matcher = NodeMatcher(graph)
#pbNode = matcher.match("KEYWORDS", kw.upper(), name=kw.lower()).first()
pbNode = matcher.match("Keywords", kw.lower(), name=kw.lower()).first()
if pbNode == None:
pbNode = Node('Keywords', kw.lower(), name=kw.lower())
path_1 = Path(pub, 'CONTAINS', pbNode)
graph.create(path_1)
else:
#Check for existing relationship
rmatcher = RelationshipMatcher(graph)
auNode = rmatcher.match((pbNode,pub), "CONTAINS").first()
if auNode is None:
path_1 = Path(pub, 'CONTAINS', pbNode)
graph.create(path_1)
def _createReferences(pub, references):
graph = connectGraph()
print(' Creating References')
for ref in references:
#Find the Paper details
matcher = NodeMatcher(graph)
pbNode = matcher.match("Paper", id=ref).first()
if pbNode == None:
#path_1 = Node('PAPER', 'AMINER', name=ref)
pbNode = Node('Paper', id=ref)
path_1 = Path(pub, 'REFERENCE', pbNode)
graph.create(path_1)
else:
#Check for existing relationship
rmatcher = RelationshipMatcher(graph)
auNode = rmatcher.match((pbNode, pub), "REFERENCE").first()
if auNode is None:
path_1 = Path(pub, 'REFERENCE', pbNode)
graph.create(path_1)
def test_service_root_on_bound_path(graph):
alice = Node(name="Alice")
bob = Node(name="Bob")
carol = Node(name="Carol")
dave = Node(name="Dave")
path = Path(alice, "LOVES", bob, Rev("HATES"), carol, "KNOWS", dave)
graph.create(path)
assert path.service_root == ServiceRoot("http://localhost:7474/")
path[0].unbind()
assert path.service_root == ServiceRoot("http://localhost:7474/")
def test_path_in_several_ways():
alice = Node(name="Alice")
bob = Node(name="Bob")
carol = Node(name="Carol")
dave = Node(name="Dave")
path = Path(alice, "LOVES", bob, Rev("HATES"), carol, "KNOWS", dave)
assert path.__bool__()
assert path.__nonzero__()
assert path[0] == Relationship(alice, "LOVES", bob)
assert path[1] == Relationship(carol, "HATES", bob)
assert path[2] == Relationship(carol, "KNOWS", dave)
assert path[-1] == Relationship(carol, "KNOWS", dave)
assert path[0:1] == Path(alice, "LOVES", bob)
assert path[0:2] == Path(alice, "LOVES", bob, Rev("HATES"), carol)
try:
_ = path[7]
except IndexError:
assert True
else:
assert False