Class: Neo4j::Http::RelationshipClient
- Inherits:
-
Object
- Object
- Neo4j::Http::RelationshipClient
- Defined in:
- lib/neo4j/http/relationship_client.rb
Class Method Summary collapse
Instance Method Summary collapse
- #build_match_selector(name, data) ⇒ Object
- #delete_relationship(relationship:, from:, to:) ⇒ Object
- #delete_relationship_on_primary_key(relationship:) ⇒ Object
- #find_relationship(from:, relationship:, to:) ⇒ Object
- #find_relationships(from:, relationship:, to:) ⇒ Object
-
#initialize(cypher_client) ⇒ RelationshipClient
constructor
A new instance of RelationshipClient.
- #upsert_relationship(relationship:, from:, to:, create_nodes: false) ⇒ Object
Constructor Details
#initialize(cypher_client) ⇒ RelationshipClient
Returns a new instance of RelationshipClient.
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# File 'lib/neo4j/http/relationship_client.rb', line 10 def initialize(cypher_client) @cypher_client = cypher_client end |
Class Method Details
.default ⇒ Object
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# File 'lib/neo4j/http/relationship_client.rb', line 6 def self.default @default ||= new(CypherClient.default) end |
Instance Method Details
#build_match_selector(name, data) ⇒ Object
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# File 'lib/neo4j/http/relationship_client.rb', line 69 def build_match_selector(name, data) selector = +"#{name}:#{data.label}" selector << " {#{data.key_name}: $#{name}.#{data.key_name}}" if data.key_name.present? selector end |
#delete_relationship(relationship:, from:, to:) ⇒ Object
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# File 'lib/neo4j/http/relationship_client.rb', line 75 def delete_relationship(relationship:, from:, to:) from_selector = build_match_selector(:from, from) to_selector = build_match_selector(:to, to) relationship_selector = build_match_selector(:relationship, relationship) cypher = <<-CYPHER MATCH (#{from_selector}) - [#{relationship_selector}] - (#{to_selector}) WITH from, to, relationship DELETE relationship RETURN from, to CYPHER results = @cypher_client.execute_cypher(cypher, from: from, to: to) results&.first end |
#delete_relationship_on_primary_key(relationship:) ⇒ Object
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# File 'lib/neo4j/http/relationship_client.rb', line 91 def delete_relationship_on_primary_key(relationship:) # protection against mass deletion of relationships return if relationship.key_name.nil? relationship_selector = build_match_selector(:relationship, relationship) cypher = <<-CYPHER MATCH () - [#{relationship_selector}] - () WITH relationship DELETE relationship RETURN relationship CYPHER results = @cypher_client.execute_cypher(cypher, relationship: relationship) results&.first end |
#find_relationship(from:, relationship:, to:) ⇒ Object
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# File 'lib/neo4j/http/relationship_client.rb', line 64 def find_relationship(from:, relationship:, to:) results = find_relationships(from: from, to: to, relationship: relationship) results&.first end |
#find_relationships(from:, relationship:, to:) ⇒ Object
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# File 'lib/neo4j/http/relationship_client.rb', line 46 def find_relationships(from:, relationship:, to:) from_match_clause = build_match_selector(:from, from) to_match_clause = build_match_selector(:to, to) relationship_clause = build_match_selector(:relationship, relationship) cypher = <<-CYPHER MATCH (#{from_match_clause}) - [#{relationship_clause}] - (#{to_match_clause}) RETURN from, to, relationship CYPHER @cypher_client.execute_cypher( cypher, from: from, to: to, relationship: relationship, access_mode: "READ" ) end |
#upsert_relationship(relationship:, from:, to:, create_nodes: false) ⇒ Object
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# File 'lib/neo4j/http/relationship_client.rb', line 14 def upsert_relationship(relationship:, from:, to:, create_nodes: false) match_or_merge = create_nodes ? "MERGE" : "MATCH" from_selector = build_match_selector(:from, from) to_selector = build_match_selector(:to, to) relationship_selector = build_match_selector(:relationship, relationship) on_match = "" if relationship.attributes.present? on_match = <<-CYPHER ON CREATE SET relationship += $relationship_attributes ON MATCH SET relationship += $relationship_attributes CYPHER end cypher = +<<-CYPHER #{match_or_merge} (#{from_selector}) #{match_or_merge} (#{to_selector}) MERGE (from) - [#{relationship_selector}] - (to) #{on_match} RETURN from, to, relationship CYPHER results = @cypher_client.execute_cypher( cypher, from: from, to: to, relationship: relationship, relationship_attributes: relationship.attributes ) results&.first end |