Class: Neo4j::Label

Inherits:

Object

• Object
• Neo4j::Label

show all

Extended by:

Core::CypherTranslator

Defined in:

lib/neo4j/label.rb

Overview

Defined Under Namespace

Classes: InvalidQueryError

Constant Summary

Constants included from Core::CypherTranslator

Core::CypherTranslator::EMPTY_PROPS, Core::CypherTranslator::SANITIZE_ESCAPED_REGEXP

Class Method Summary (collapse)

• + (Object) create(name, session = Neo4j::Session.current)

  Returns a label of given name that can be used to specifying constraints.

• + (Enumerable<Neo4j::Node>) find_all_nodes(label_name, session = Neo4j::Session.current)

  All nodes having given label.

• + (Enumerable<Neo4j::Node>) find_nodes(label_name, key, value, session = Neo4j::Session.current)

  All nodes having given label and properties.

Instance Method Summary (collapse)

• - (Object) create_constraint(property, constraints, session = Neo4j::Session.current)

  Creates a neo4j constraint on a property See docs.neo4j.org/chunked/stable/query-constraints.html.

• - (Object) create_index(*properties) abstract
• - (Object) drop_constraint(property, constraint, session = Neo4j::Session.current)

  Drops a neo4j constraint on a property See docs.neo4j.org/chunked/stable/query-constraints.html.

• - (Object) drop_index(*properties) abstract
• - (Object) indexes abstract

  List indices for a label.

• - (Object) name abstract

Methods included from Core::CypherTranslator

create_escape_value, cypher_prop_list, cypher_string, escape_quotes, escape_value, label_string, prop_identifier, sanitize_escape_sequences, sanitized_column_names, translate_response

67
68
69

# File 'lib/neo4j/label.rb', line 67

def create(name, session = Neo4j::Session.current)
  session.create_label(name)
end

73
74
75

# File 'lib/neo4j/label.rb', line 73

def find_all_nodes(label_name, session = Neo4j::Session.current)
  session.find_all_nodes(label_name)
end

78
79
80

# File 'lib/neo4j/label.rb', line 78

def find_nodes(label_name, key, value, session = Neo4j::Session.current)
  session.find_nodes(label_name, key, value)
end

label = Neo4j::Label.create(:person, session)
label.create_constraint(:name, {type: :unique}, session)

35
36
37
38
39
40
41
42
43

# File 'lib/neo4j/label.rb', line 35

def create_constraint(property, constraints, session = Neo4j::Session.current)
  cypher = case constraints[:type]
           when :unique
             "CREATE CONSTRAINT ON (n:`#{name}`) ASSERT n.`#{property}` IS UNIQUE"
           else
             fail "Not supported constrain #{constraints.inspect} for property #{property} (expected :type => :unique)"
           end
  session._query_or_fail(cypher)
end

14
15
16

# File 'lib/neo4j/label.rb', line 14

def create_index(*properties)
  fail 'not implemented'
end

label = Neo4j::Label.create(:person, session)
label.create_constraint(:name, {type: :unique}, session)
label.drop_constraint(:name, {type: :unique}, session)

52
53
54
55
56
57
58
59
60

# File 'lib/neo4j/label.rb', line 52

def drop_constraint(property, constraint, session = Neo4j::Session.current)
  cypher = case constraint[:type]
           when :unique
             "DROP CONSTRAINT ON (n:`#{name}`) ASSERT n.`#{property}` IS UNIQUE"
           else
             fail "Not supported constrain #{constraint.inspect}"
           end
  session._query_or_fail(cypher)
end

19
20
21

# File 'lib/neo4j/label.rb', line 19

def drop_index(*properties)
  fail 'not implemented'
end

25
26
27

# File 'lib/neo4j/label.rb', line 25

def indexes
  fail 'not implemented'
end

9
10
11

# File 'lib/neo4j/label.rb', line 9

def name
  fail 'not implemented'
end