Module: Map::Integrations::ActiveRecord::ClassMethods

Defined in:
lib/map/integrations/active_record.rb

Instance Method Summary collapse

Instance Method Details

#to_map(record, *args) ⇒ Object


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# File 'lib/map/integrations/active_record.rb', line 10

def to_map( record , *args )
  # prep
  model         = record.class
  map           = Map.new
  map[ :model ] = model.name.underscore
  map[ :id ]    = record.id

  # yank out options if they are patently obvious...
  if args.size == 2 and args.first.is_a?( Array ) and args.last.is_a?( Hash )
    options = Map.for args.last
    args = args.first
  else
    options = nil
  end

  # get base to_dao from class
  base = column_names

  # available options keys
  opts = %w( include includes with exclude excludes without )

  # proc to remove options
  extract_options =
    proc do |array|
      to_return = Map.new
      last = array.last
      if last.is_a?( Hash )
        last = Map.for last
        if opts.any? { | opt | last.has_key? opt }
          array.pop
          to_return = last
        end
      end
      to_return
    end

  # handle case where options are bundled in args...
  options ||= extract_options[args]

  # use base options iff none provided
  base_options = extract_options[base]
  if options.blank? and !base_options.blank?
    options = base_options
  end

  # refine the args with includes iff found in options
  include_opts = [ :include , :includes , :with ]
  if options.any? { | option | include_opts.include? option.to_sym }
    args.replace( base ) if args.empty?
    args.push( options[ :include ] )  if options[ :include ]
    args.push( options[ :includes ] ) if options[ :includes ]
    args.push( options[ :with ] )     if options[ :with ]
  end

  # take passed in args or model defaults
  list = args.empty? ? base : args
  list = column_names if list.empty?

  # proc to ensure we're all mapped out
  map_nested =
    proc do | value , *args |
      if value.is_a?( Array )
        value.map { | v | map_nested[ v , *args ] }
      else
        if value.respond_to? :to_map
          value.to_map *args
        else
          value
        end
      end
    end

  # okay - go!
  list.flatten.each do | attr |
    if attr.is_a?( Array )
      related , *argv = attr
      v = record.send related
      value = map_nested[ value , *argv ]
      map[ related ] = value
      next
    end

    if attr.is_a?( Hash )
      attr.each do | related , argv |
        v = record.send related
        argv = !argv.is_a?( Array ) ? [ argv ] : argv
        value = map_nested[ v , *argv ]
        map[ related ] = value
      end
      next
    end

    value = record.send attr

    if value.respond_to?( :to_map )
      map[ attr ] = value.to_map
      next
    end

    if value.is_a?( Array )
      map[ attr ] = value.map &map_nested
      next
    end

    map[ attr ] = value
  end

  # refine the map with excludes iff passed as options
  exclude_opts = [ :exclude , :excludes , :without ]
  if options.any? { | option | exclude_opts.include? option.to_sym }
    [ options[ :exclude ] , options[ :excludes ] , options[ :without ] ].each do | paths |
      paths = Array paths
      next if paths.blank?
      paths.each { | path | map.rm path }
    end
  end

  map
end