Module: IronTrail::Reifier

Defined in:
lib/iron_trail/reifier.rb

Class Method Summary collapse

Class Method Details

.model_from_table_name(table_name, sti_type = nil) ⇒ Object 



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# File 'lib/iron_trail/reifier.rb', line 29

def self.model_from_table_name(table_name, sti_type=nil)
  index = ActiveRecord::Base.descendants.reject(&:abstract_class).chunk(&:table_name).to_h do |key, val|
    v = \
      if val.length == 1
        val[0]
      else
        val.to_h { |k| [k.to_s, k] }
      end

    [key, v]
  end

  klass = index[table_name]
  raise "Cannot infer model from table named '#{table_name}'" unless klass

  return klass unless klass.is_a?(Hash)
  klass = klass[sti_type]

  return klass if klass

  raise "Cannot infer STI model for table #{table_name} and type '#{sti_type}'"
end

.reify(trail) ⇒ Object 



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# File 'lib/iron_trail/reifier.rb', line 5

def self.reify(trail)
  source_attributes = (trail.delete_operation? ? trail.rec_old : trail.rec_new)
  klass = model_from_table_name(trail.rec_table, source_attributes['type'])

  record = klass.where(id: trail.rec_id).first || klass.new

  source_attributes.each do |name, value|
    if record.has_attribute?(name)
      record[name.to_sym] = value
    elsif record.respond_to?("#{name}=")
      record.send("#{name}=", value)
    else
      ghost = record.instance_variable_get(:@irontrail_reified_ghost_attributes)
      unless ghost
        ghost = HashWithIndifferentAccess.new
        record.instance_variable_set(:@irontrail_reified_ghost_attributes, ghost)
      end
      ghost[name] = value
    end
  end

  record
end