Method: Ridgepole::Diff#diff

Defined in:
lib/ridgepole/diff.rb

#diff(from, to, options = {}) ⇒ Object 



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# File 'lib/ridgepole/diff.rb', line 6

def diff(from, to, options = {})
  from = (from || {}).deep_dup
  to = (to || {}).deep_dup

  if @options[:reverse]
    from, to = to, from
  end

  delta = {}
  scan_table_rename(from, to, delta)
  # for reverse option
  scan_table_rename(to, from, delta)

  to.each do |table_name, to_attrs|
    next unless target?(table_name)

    if (from_attrs = from.delete(table_name))
      scan_change(table_name, from_attrs, to_attrs, delta)
    else
      delta[:add] ||= {}
      delta[:add][table_name] = to_attrs
    end
  end

  unless @options[:merge]
    from.each do |table_name, from_attrs|
      next unless target?(table_name)

      delta[:delete] ||= {}
      delta[:delete][table_name] = from_attrs
    end
  end

  delta[:execute] = options[:execute]

  Ridgepole::Delta.new(delta, @options)
end