Class: ActiveCypher::Fixtures::RelBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/active_cypher/fixtures/rel_builder.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.bulk_build(rels, batch_size: 200) ⇒ Object

Bulk create relationships for performance using UNWIND batching

Parameters:

  • rels (Array<Hash>) —

    relationship definitions (from DSLContext)

  • batch_size (Integer) (defaults to: 200) —

    batch size for UNWIND



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# File 'lib/active_cypher/fixtures/rel_builder.rb', line 49

def self.bulk_build(rels, batch_size: 200)
  # Check all relationships for cross-DB violations first
  rels.each do |rel|
    from = Registry.get(rel[:from_ref])
    to = Registry.get(rel[:to_ref])
    raise FixtureError, "Both endpoints must exist: #{rel[:from_ref]}, #{rel[:to_ref]}" unless from && to

    from_conn = from.class.connection
    to_conn   = to.class.connection
    raise FixtureError, 'Cross-database relationship? Sorry, your data has commitment issues.' if from_conn != to_conn
  end

  # Group by connection
  grouped = rels.group_by do |rel|
    from = Registry.get(rel[:from_ref])
    from.class.connection
  end

  grouped.each do |conn, group|
    group.each_slice(batch_size) do |batch|
      unwind_batch = batch.map do |rel|
        from = Registry.get(rel[:from_ref])
        to   = Registry.get(rel[:to_ref])

        {
          from_name: from.name,
          from_label: from.class.labels.first,
          to_name: to.name,
          to_label: to.class.labels.first,
          props: rel[:props] || {},
          type: rel[:type].to_s
        }
      end

      cypher = "        UNWIND $rows AS row\n        MATCH (a:\#{unwind_batch.first[:from_label]} {name: row.from_name})\n        MATCH (b:\#{unwind_batch.first[:to_label]} {name: row.to_name})\n        CREATE (a)-[r:\#{unwind_batch.first[:type]} {props: row.props}]->(b)\n      CYPHER\n\n      conn.execute_cypher(cypher, rows: unwind_batch)\n    end\n  end\nend\n"

Instance Method Details

#build(_ref, from_ref, type, to_ref, props = {}) ⇒ void

This method returns an undefined value.

Builds a relationship between two nodes, enforcing cross-DB safety.

Parameters:

  • _ref (Symbol, String) —

    Logical reference for this relationship (not used for DB, but for registry/uniqueness)

  • from_ref (Symbol, String) —

    Logical ref of the start node

  • type (Symbol, String) —

    Relationship type (e.g., :LIKES)

  • to_ref (Symbol, String) —

    Logical ref of the end node

  • props (Hash) (defaults to: {}) —

    Optional properties for the relationship

Raises:

  • (ActiveCypher::FixtureError) —

    if cross-DB relationship is attempted



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# File 'lib/active_cypher/fixtures/rel_builder.rb', line 15

def build(_ref, from_ref, type, to_ref, props = {})
  from = Registry.get(from_ref)
  to   = Registry.get(to_ref)

  raise FixtureError, "Missing from node: #{from_ref}" unless from
  raise FixtureError, "Missing to node: #{to_ref}" unless to

  from_conn = from.class.connection
  to_conn   = to.class.connection

  raise FixtureError, 'Cross-database relationship? Sorry, your data has commitment issues.' if from_conn != to_conn

  from_label = from.class.labels.first
  to_label   = to.class.labels.first

  cypher = "    MATCH (a:\#{from_label} {name: $from_name}), (b:\#{to_label} {name: $to_name})\n    CREATE (a)-[r:\#{type} $props]->(b)\n    RETURN r\n  CYPHER\n\n  from_conn.execute_cypher(\n    cypher,\n    from_name: from.name,\n    to_name: to.name,\n    props: props\n  )\n\n  nil\nend\n"