Module: DagMe::Macro

Defined in:
lib/dag_me/macro.rb

Instance Method Summary collapse

Instance Method Details

#dag_me(name = nil, maintain: :postgresql_closure, scope: nil, prefix: nil, edge_table: nil, paths_table: nil) ⇒ Object

Declares a DAG on the model. Called bare it defines the model's default graph; called with a name it defines an independent named graph, so one node can belong to many networks:

class Relay < ApplicationRecord
dag_me :power
dag_me :comms, maintain: :recursive_cte
end

relay.add_child(other, dag: :power)
relay.comms_children
Relay.dag(:power).rebuild!

Raises:

  • (ArgumentError) 


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# File 'lib/dag_me/macro.rb', line 17

def dag_me(name = nil, maintain: :postgresql_closure, scope: nil, prefix: nil, edge_table: nil, paths_table: nil)
  key = name&.to_sym || :default
  unless include?(DagMe::Model)
    class_attribute :dag_configs, instance_writer: false, instance_predicate: false, default: {}.freeze
    include DagMe::Model
  end
  raise ArgumentError, "#{self.name}: dag #{key.inspect} is already defined" if dag_configs.key?(key)

  config = Configuration.new(model: self, name: name&.to_sym, maintain:, scope:, prefix:, edge_table:, paths_table:)
  self.dag_configs = dag_configs.merge(key => config).freeze
  DagMe::Model.attach(self, config)
  self
end