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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 (attrs_delta = diff_inspect(from_attrs, to_attrs)).empty?
@logger.verbose_info(attrs_delta)
end
scan_change(table_name, from_attrs, to_attrs, delta)
else
delta[:add] ||= {}
delta[:add][table_name] = to_attrs
end
end
scan_relation_info(relation_info)
unless @options[:merge] || @options[:skip_drop_table]
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
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