Class: Cyrel::Clause::Merge

Inherits:

Base

• Object
• Base
• Cyrel::Clause::Merge

Defined in:

lib/cyrel/clause/merge.rb

Overview

Represents a MERGE clause in a Cypher query. Used to find a pattern or create it if it doesn’t exist.

Instance Attribute Summary

• #pattern ⇒ Object readonly

  Returns the value of attribute pattern.

Instance Method Summary

• #initialize(pattern) ⇒ Merge constructor

  A new instance of Merge.

• #render(query) ⇒ String

  Renders the MERGE clause.

Constructor Details

#initialize(pattern) ⇒ Merge

Returns a new instance of Merge.

Parameters:

• pattern (Cyrel::Pattern::Path, Cyrel::Pattern::Node, Cyrel::Pattern::Relationship) —

  The pattern to merge. Typically a Path or Node.

# File 'lib/cyrel/clause/merge.rb', line 14

def initialize(pattern)
  Cyrel::Pattern.assert_pattern!(pattern, 'MERGE')

  @pattern = pattern
end

Instance Attribute Details

#pattern ⇒ Object (readonly)

Returns the value of attribute pattern.

# File 'lib/cyrel/clause/merge.rb', line 8

def pattern
  @pattern
end

Instance Method Details

#render(query) ⇒ String

Renders the MERGE clause.

Parameters:

• query (Cyrel::Query) —

  The query object for rendering the pattern.

Returns:

• (String) —

  The Cypher string fragment for the clause.

# File 'lib/cyrel/clause/merge.rb', line 23

def render(query)
  pattern_string = @pattern.render(query)
  "MERGE #{pattern_string}"
  # TODO: Append ON CREATE SET / ON MATCH SET rendering when implemented.
end