Class: Ridgepole::Diff

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

Constant Summary collapse

PRIMARY_KEY_OPTIONS = 
%i[id limit default null precision scale collation unsigned].freeze

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 7

def initialize(options = {})
  @options = options
  @logger = Ridgepole::Logger.instance
end

Instance Method Details

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



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# File 'lib/ridgepole/diff.rb', line 12

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

  check_table_existence(to)

  delta = {}
  relation_info = {}

  scan_table_rename(from, to, delta)

  to.each do |table_name, to_attrs|
    collect_relation_info!(table_name, to_attrs, relation_info)

    next unless target?(table_name)

    if (from_attrs = from.delete(table_name))
      @logger.verbose_info("#   #{table_name}")

      unless @options[:drop_table_only]
        unless (attrs_delta = diff_inspect(from_attrs, to_attrs)).empty?
          @logger.verbose_info(attrs_delta)
        end

        scan_change(table_name, from_attrs, to_attrs, delta)
      end
    elsif !@options[:drop_table_only]
      delta[:add] ||= {}
      delta[:add][table_name] = to_attrs
    end
  end

  scan_relation_info(relation_info)

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

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

      foreign_keys = from_attrs.fetch(:foreign_keys, {})
      next if foreign_keys.empty?

      table_delta = {}
      scan_foreign_keys_change(foreign_keys, {}, table_delta, @options)
      delta[:change] ||= {}
      delta[:change][table_name] = table_delta
    end
  end

  delta[:execute] = options[:execute]

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