Class: Separatum::Importers::ActiveRecord

Inherits:
Object
  • Object
show all
Defined in:
lib/separatum/importers/active_record.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(**params) ⇒ ActiveRecord

Returns a new instance of ActiveRecord.



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# File 'lib/separatum/importers/active_record.rb', line 8

def initialize(**params)
  @max_depth = params[:max_depth] || 3
  @edge_classes = params[:edge_classes] || []
  @denied_classes = params[:denied_classes] || []
  @denied_class_transitions = params[:denied_class_transitions] || []

  @svg_file_name = params[:svg_file_name]
  @dot_file_name = params[:dot_file_name]

  @klass_transitions = Set[]
  @object_transitions = Set[]
  @objects = Set[]
  @time_machine = Time.now
end

Instance Attribute Details

#klass_transitions ⇒ Object (readonly)

Returns the value of attribute klass_transitions.



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# File 'lib/separatum/importers/active_record.rb', line 6

def klass_transitions
  @klass_transitions
end

#object_transitions ⇒ Object (readonly)

Returns the value of attribute object_transitions.



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# File 'lib/separatum/importers/active_record.rb', line 6

def object_transitions
  @object_transitions
end

Instance Method Details

#act(object, depth = 1) ⇒ Object 



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# File 'lib/separatum/importers/active_record.rb', line 42

def act(object, depth = 1)
  object.class.reflections.each do |association_name, reflection|
    # Skip Through associations
    next if reflection.is_a?(::ActiveRecord::Reflection::ThroughReflection)

    # Skip empty associations
    next if object.send(association_name).nil?

    # Limit depth
    next if depth >= @max_depth

    case reflection.macro
    when :belongs_to, :has_one
      next_object = object.send(association_name)
      next unless process_link(object, next_object)
      puts "#{depth}#{' ' * depth}[#{reflection.macro}] #{object.class} -> #{next_object.class}"
      act(next_object, depth + 1)

    when :has_many, :has_and_belongs_to_many
      new_objects = object.send(association_name)
      new_objects.each do |next_object|
        next unless process_link(object, next_object)
        puts "#{depth}#{' ' * depth}[#{reflection.macro}] #{object.class} -> #{next_object.class}"
        act(next_object, depth + 1)
      end

    else
      fail("Unknown association `#{reflection.macro.inspect} :#{association_name}' in #{object.class}")
    end
  end
end

#call(*objects) ⇒ Object 



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# File 'lib/separatum/importers/active_record.rb', line 23

def call(*objects)
  result = []
  objects.flatten.each do |object|
    @objects = Set[object]
    act(object)
    result += @objects.to_a
  end

  if @svg_file_name || @dot_file_name
    if defined? ::GraphViz
      ::Separatum::GraphViz::Drawer.new(svg_file_name: @svg_file_name, dot_file_name: @dot_file_name).draw(@object_transitions)
    else
      fail("GraphViz const is undefined. Use ruby-graphviz gem")
    end
  end

  ::Separatum::Converters::Object2Hash.new(common_fields: { _time_machine: @time_machine }).(result.flatten.uniq)
end

#process_link(prev_object, next_object) ⇒ Object 



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# File 'lib/separatum/importers/active_record.rb', line 74

def process_link(prev_object, next_object)
  # Skip already added object
  return if @objects.include?(next_object)

  # Skip already processed link
  return if @object_transitions.include?([prev_object, next_object])

  # Stuck on edge classes
  return if @edge_classes.include?(prev_object.class)

  # Will not go to denied classes
  return if @denied_classes.include?(next_object.class)

  # Will not go through denied transitions
  return if @denied_class_transitions.include?([prev_object.class, next_object.class])

  @objects.add(next_object)
  @klass_transitions.add([prev_object.class, next_object.class])
  @object_transitions.add([prev_object, next_object])

  true
end