Class: Ridgepole::Diff

Inherits:
Object
  • Object
show all
Defined in:
lib/ridgepole/diff.rb

Instance Method Summary collapse

Constructor Details

#initialize(options = {}) ⇒ Diff

Returns a new instance of Diff.



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# File 'lib/ridgepole/diff.rb', line 2

def initialize(options = {})
  @options = options
end

Instance Method Details

#diff(from, to) ⇒ Object 



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

def diff(from, to)
  from = (from || {}).dup
  to = (to || {}).dup
  delta = {}

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

    if (from_table_name = (to_attrs[:options] || {}).delete(:rename_from))
      unless from.has_key?(from_table_name)
        raise "Table `#{from_table_name}` not found"
      end

      delta[:rename] ||= {}
      delta[:rename][table_name] = from_table_name
      from.delete(from_table_name)
      to.delete(table_name)
    end
  end

  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

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