Class: Neo4j::Server::CypherRelationship

Inherits:
Relationship show all
Includes:
Core::ActiveEntity, Core::CypherTranslator, Resource
Defined in:
lib/neo4j-server/cypher_relationship.rb

Constant Summary

Constant Summary

Constants included from Core::CypherTranslator

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

Constants included from PropertyValidator

PropertyValidator::VALID_PROPERTY_VALUE_CLASSES

Instance Attribute Summary (collapse)

Attributes included from Resource

#resource_data, #resource_url

Instance Method Summary (collapse)

Methods included from Core::ActiveEntity

#persisted?

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

Methods included from Resource

#convert_from_json_value, #expect_response_code, #handle_response_error, #init_resource_data, #resource_headers, #resource_url_id, #response_exception, #wrap_resource

Methods inherited from Relationship

_load, #_other_node, create, #end_node, load, #other_node, #start_node

Methods included from Relationship::Wrapper

#neo4j_obj, #wrapper

Methods included from PropertyContainer

#[], #[]=

Methods included from PropertyValidator

#valid_property?, #validate_property

Constructor Details

- (CypherRelationship) initialize(session, value)

Returns a new instance of CypherRelationship



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# File 'lib/neo4j-server/cypher_relationship.rb', line 8

def initialize(session, value)
  @session = session
  @response_hash = value
  @rel_type = @response_hash['type']
  @props = @response_hash['data']
  @start_node_neo_id = @response_hash['start'].is_a?(Integer) ? @response_hash['start'] : @response_hash['start'].match(/\d+$/)[0].to_i
  @end_node_neo_id = @response_hash['end'].is_a?(Integer) ? @response_hash['end'] : @response_hash['end'].match(/\d+$/)[0].to_i
  @id = @response_hash['id']
end

Instance Attribute Details

- (Object) end_node_neo_id (readonly)

Returns the value of attribute end_node_neo_id



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# File 'lib/neo4j-server/cypher_relationship.rb', line 41

def end_node_neo_id
  @end_node_neo_id
end

- (Object) id (readonly)

Returns the value of attribute id



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# File 'lib/neo4j-server/cypher_relationship.rb', line 23

def id
  @id
end

- (Object) start_node_neo_id (readonly)

Returns the value of attribute start_node_neo_id



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# File 'lib/neo4j-server/cypher_relationship.rb', line 39

def start_node_neo_id
  @start_node_neo_id
end

Instance Method Details

- (Object) ==(other) Also known as: eql? 



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# File 'lib/neo4j-server/cypher_relationship.rb', line 18

def ==(other)
  other.class == self.class && other.neo_id == neo_id
end

- (Object) _end_node 



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# File 'lib/neo4j-server/cypher_relationship.rb', line 55

def _end_node
  load_resource
  @_end_node ||= Neo4j::Node._load(end_node_neo_id)
end

- (Object) _end_node_id 



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# File 'lib/neo4j-server/cypher_relationship.rb', line 47

def _end_node_id
  @end_node_neo_id ||= get_node_id(:end)
end

- (Object) _start_node 



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# File 'lib/neo4j-server/cypher_relationship.rb', line 51

def _start_node
  @_start_node ||= Neo4j::Node._load(start_node_neo_id)
end

- (Object) _start_node_id 



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# File 'lib/neo4j-server/cypher_relationship.rb', line 43

def _start_node_id
  @start_node_neo_id ||= get_node_id(:start)
end

- (Object) del Also known as: delete, destroy 



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# File 'lib/neo4j-server/cypher_relationship.rb', line 107

def del
  @session._query("#{match_start} DELETE n", neo_id: neo_id)
end

- (Boolean) exist?

Returns:

  • (Boolean) 


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# File 'lib/neo4j-server/cypher_relationship.rb', line 113

def exist?
  response = @session._query("#{match_start} RETURN n", neo_id: neo_id)
  # binding.pry
  (response.data.nil? || response.data.empty?) ? false : true
end

- (Object) get_node_id(direction) 



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# File 'lib/neo4j-server/cypher_relationship.rb', line 60

def get_node_id(direction)
  load_resource
  resource_url_id(resource_url(direction))
end

- (Object) get_property(key) 



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# File 'lib/neo4j-server/cypher_relationship.rb', line 65

def get_property(key)
  @session._query_or_fail("#{match_start} RETURN n.`#{key}`", true, neo_id: neo_id)
end

- (Object) inspect 



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# File 'lib/neo4j-server/cypher_relationship.rb', line 29

def inspect
  "CypherRelationship #{neo_id}"
end

- (Object) load_resource 



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# File 'lib/neo4j-server/cypher_relationship.rb', line 33

def load_resource
  return if resource_data_present?

  @resource_data = @session._query_or_fail("#{match_start} RETURN n", true, neo_id: neo_id) # r.first_data
end

- (Object) neo_id 



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# File 'lib/neo4j-server/cypher_relationship.rb', line 25

def neo_id
  id
end

- (Hash<Symbol,Object>) props

Returns all properties of the relationship

Returns:

  • (Hash<Symbol,Object>) —

    all properties of the relationship



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# File 'lib/neo4j-server/cypher_relationship.rb', line 78

def props
  if @props
    @props
  else
    hash = @session._query_entity_data("#{match_start} RETURN n", nil, neo_id: neo_id)
    @props = Hash[hash['data'].map { |k, v| [k.to_sym, v] }]
  end
end

- (Object) props=(properties)

replace all properties with new properties

Parameters:

  • properties (Hash) —

    a hash of properties the relationship should have



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# File 'lib/neo4j-server/cypher_relationship.rb', line 88

def props=(properties)
  @session._query_or_fail("#{match_start} SET n = { props }", false,  props: properties, neo_id: neo_id)
  properties
end

- (Object) rel_type 



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# File 'lib/neo4j-server/cypher_relationship.rb', line 103

def rel_type
  @rel_type.to_sym
end

- (Object) remove_property(key) 



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# File 'lib/neo4j-server/cypher_relationship.rb', line 73

def remove_property(key)
  @session._query_or_fail("#{match_start} REMOVE n.`#{key}`", false, neo_id: neo_id)
end

- (Object) set_property(key, value) 



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# File 'lib/neo4j-server/cypher_relationship.rb', line 69

def set_property(key, value)
  @session._query_or_fail("#{match_start} SET n.`#{key}` = {value}", false,  value: value, neo_id: neo_id)
end

- (Object) update_props(properties)

Updates the properties, keeps old properties

Parameters:

  • properties (Hash<Symbol,Object>) —

    hash of properties that should be updated on the relationship



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# File 'lib/neo4j-server/cypher_relationship.rb', line 94

def update_props(properties)
  return if properties.empty?
  q = "#{match_start} SET " + properties.keys.map do |k|
    "n.`#{k}`= #{escape_value(properties[k])}"
  end.join(',')
  @session._query_or_fail(q, false, neo_id: neo_id)
  properties
end